bbswitch module fails to start at startup

[surajrv6]

bbswitch module fails to load at startup. The module keeps unloading itself. Unable to use bbswitch with bumblebee. I am able to load the module manually using # modprobe bbswitch and also able to turn off and the graphics card. I am on Arch linux.
I had the same problem in Debian (testing and stable) as well.
I am using ASUS TUF FX504GD laptop
I didnot try any boot options like acpi_osi...

Linux suraj-laptop 5.3.1-arch1-1-ARCH #1 SMP PREEMPT Sat Sep 21 11:33:49 UTC 2019 x86_64 GNU/Linux

dmesg log

[root@suraj-laptop suraj]# dmesg | grep -C 10 bbswitch:
[    2.383351] systemd[1]: Set hostname to <suraj-laptop>.
[    2.455952] usb 1-14: new full-speed USB device number 4 using xhci_hcd
[    2.548224] systemd[1]: Created slice system-getty.slice.
[    2.548696] systemd[1]: Created slice system-systemd\x2dfsck.slice.
[    2.549945] systemd[1]: Created slice User and Session Slice.
[    2.550812] systemd[1]: Started Dispatch Password Requests to Console Directory Watch.
[    2.551654] systemd[1]: Started Forward Password Requests to Wall Directory Watch.
[    2.552737] systemd[1]: Set up automount Arbitrary Executable File Formats File System Automount Point.
[    2.553571] systemd[1]: Reached target Local Encrypted Volumes.
[    2.577949] EXT4-fs (sda3): re-mounted. Opts: (null)
[    2.578742] bbswitch: loading out-of-tree module taints kernel.
[    2.578765] bbswitch: module verification failed: signature and/or required key missing - tainting kernel
[    2.578975] bbswitch: version 0.8
[    2.578981] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
[    2.578987] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
[    2.578997] ACPI Warning: \_SB.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20190703/nsarguments-59)
[    2.579149] bbswitch: detected an Optimus _DSM function
[    2.579158] pci 0000:01:00.0: enabling device (0006 -> 0007)
[    2.579297] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
[    2.579456] random: lvm: uninitialized urandom read (4 bytes read)
[    2.596891] usb 1-14: New USB device found, idVendor=8087, idProduct=0aaa, bcdDevice= 0.02
[    2.596892] usb 1-14: New USB device strings: Mfr=0, Product=0, SerialNumber=0
[    2.756548] audit: type=1130 audit(1569826524.009:2): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-journald comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[    2.761488] systemd-journald[319]: Received client request to flush runtime journal.
[    2.794184] audit: type=1130 audit(1569826524.045:3): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-udevd comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[    2.834605] input: Asus Wireless Radio Control as /devices/LNXSYSTM:00/LNXSYBUS:00/ATK4002:00/input/input6
[    2.836898] audit: type=1130 audit(1569826524.089:4): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-journal-flush comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[    2.837570] ACPI: AC Adapter [ACAD] (on-line)
[    2.844149] acpi PNP0C14:03: duplicate WMI GUID 05901221-D566-11D1-B2F0-00A0C9062910 (first instance was on PNP0C14:02)
--
[    3.712164] input: HDA Intel PCH HDMI/DP,pcm=10 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input20
[    3.754208] r8169 0000:02:00.0 enp2s0: Link is Down
[    3.778067] usbcore: registered new interface driver btusb
[    3.778770] Bluetooth: hci0: Firmware revision 0.1 build 216 week 27 2019
[    3.781988] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[    3.897237] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[    3.962197] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[    3.972079] iwlwifi 0000:00:14.3: BIOS contains WGDS but no WRDS
[    4.003852] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[    4.119843] iwlwifi 0000:00:14.3: Applying debug destination EXTERNAL_DRAM
[    4.142757] bbswitch: Unloaded. Discrete card 0000:01:00.0 is on
[    4.185319] iwlwifi 0000:00:14.3: FW already configured (0) - re-configuring
[    4.197844] iwlwifi 0000:00:14.3: BIOS contains WGDS but no WRDS
[    4.856001] mc: Linux media interface: v0.10
[    4.876537] videodev: Linux video capture interface: v2.00
[    5.001396] uvcvideo: Found UVC 1.00 device USB2.0 HD UVC WebCam (13d3:5666)
[    5.010443] uvcvideo 1-7:1.0: Entity type for entity Realtek Extended Controls Unit was not initialized!
[    5.010447] uvcvideo 1-7:1.0: Entity type for entity Extension 4 was not initialized!
[    5.010450] uvcvideo 1-7:1.0: Entity type for entity Processing 2 was not initialized!
[    5.010452] uvcvideo 1-7:1.0: Entity type for entity Camera 1 was not initialized!
[    5.010564] input: USB2.0 HD UVC WebCam: USB2.0 HD as /devices/pci0000:00/0000:00:14.0/usb1/1-7/1-7:1.0/input/input21
--
[   10.076710] wlo1: send auth to (my mac address) (try 1/3)
[   10.120348] wlo1: authenticated
[   10.124572] wlo1: associate with (my mac address) (try 1/3)
[   10.145268] wlo1: RX AssocResp from (my mac address) (capab=0x431 status=0 aid=5)
[   10.147825] wlo1: associated
[   10.214129] IPv6: ADDRCONF(NETDEV_CHANGE): wlo1: link becomes ready
[   10.271921] audit: type=1130 audit(1569826531.522:35): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=rtkit-daemon comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[   10.874396] audit: type=1130 audit(1569826532.125:36): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=upower comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[   14.002716] audit: type=1131 audit(1569826535.255:37): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=NetworkManager-dispatcher comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[   33.809679] audit: type=1131 audit(1569826555.062:38): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=systemd-hostnamed comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[   43.380336] bbswitch: version 0.8
[   43.380346] bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
[   43.380357] bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
[   43.380578] bbswitch: detected an Optimus _DSM function
[   43.380588] bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
[   51.921351] bbswitch: disabling discrete graphics
[   74.879599] usb 2-1: USB disconnect, device number 2
[   84.010611] usb 2-1: new SuperSpeed Gen 1 USB device number 3 using xhci_hcd
[   84.039627] usb 2-1: New USB device found, idVendor=0951, idProduct=1666, bcdDevice= 0.01
[   84.039630] usb 2-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[   84.039633] usb 2-1: Product: DataTraveler 3.0
[   84.039635] usb 2-1: Manufacturer: Kingston
[   84.039637] usb 2-1: SerialNumber: D067E
[   84.052824] usb-storage 2-1:1.0: USB Mass Storage device detected
[   84.053322] scsi host5: usb-storage 2-1:1.0
[   85.064043] scsi 5:0:0:0: Direct-Access     Kingston DataTraveler 3.0      PQ: 0 ANSI: 6

journalctl log:

[root@suraj-laptop suraj]# journalctl | grep bbswitch
Sep 29 17:57:32 suraj-laptop bumblebeed[2093]: modprobe: FATAL: Module bbswitch not found in directory /lib/modules/5.3.1-arch1-1-ARCH
Sep 29 17:57:32 suraj-laptop bumblebeed[2093]: [  827.166328] [ERROR]Module bbswitch could not be loaded (timeout?)
Sep 29 18:01:01 suraj-laptop bumblebeed[490]: modprobe: FATAL: Module bbswitch not found in directory /lib/modules/5.3.1-arch1-1-ARCH
Sep 29 18:01:01 suraj-laptop bumblebeed[490]: [    4.607108] [ERROR]Module bbswitch could not be loaded (timeout?)
Sep 29 18:18:45 suraj-laptop kernel: bbswitch: version 0.8
Sep 29 18:18:45 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 29 18:18:45 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 29 18:18:45 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 29 18:18:45 suraj-laptop kernel: bbswitch: device 0000:01:00.0 is in use by driver 'nvidia', refusing OFF
Sep 29 18:18:45 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 29 18:20:00 suraj-laptop kernel: bbswitch: version 0.8
Sep 29 18:20:00 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 29 18:20:00 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 29 18:20:00 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 29 18:20:00 suraj-laptop kernel: bbswitch: device 0000:01:00.0 is in use by driver 'nvidia', refusing OFF
Sep 29 18:20:00 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 29 18:39:57 suraj-laptop kernel: bbswitch: version 0.8
Sep 29 18:39:57 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 29 18:39:57 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 29 18:39:57 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 29 18:39:57 suraj-laptop kernel: bbswitch: device 0000:01:00.0 is in use by driver 'nvidia', refusing OFF
Sep 29 18:39:57 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 29 18:54:27 suraj-laptop kernel: bbswitch: version 0.8
Sep 29 18:54:27 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 29 18:54:27 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 29 18:54:27 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 29 18:54:27 suraj-laptop kernel: bbswitch: device 0000:01:00.0 is in use by driver 'nvidia', refusing OFF
Sep 29 18:54:27 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 29 21:11:06 suraj-laptop bumblebeed[479]: modprobe: FATAL: Module bbswitch not found in directory /lib/modules/5.3.1-arch1-1-ARCH
Sep 29 21:11:06 suraj-laptop bumblebeed[479]: [    3.575830] [ERROR]Module bbswitch could not be loaded (timeout?)
Sep 29 21:19:19 suraj-laptop bumblebeed[458]: modprobe: FATAL: Module bbswitch not found in directory /lib/modules/5.3.1-arch1-1-ARCH
Sep 29 21:19:19 suraj-laptop bumblebeed[458]: [    3.484132] [ERROR]Module bbswitch could not be loaded (timeout?)
Sep 29 21:34:03 suraj-laptop bumblebeed[419]: modprobe: FATAL: Module bbswitch not found in directory /lib/modules/5.3.1-arch1-1-ARCH
Sep 29 21:34:03 suraj-laptop bumblebeed[419]: [    3.390571] [ERROR]Module bbswitch could not be loaded (timeout?)
Sep 30 09:57:07 suraj-laptop sudo[1783]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/pacman -S bbswitch
Sep 30 09:57:42 suraj-laptop sudo[1817]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/modprobe bbswitch
Sep 30 09:57:42 suraj-laptop kernel: bbswitch: loading out-of-tree module taints kernel.
Sep 30 09:57:42 suraj-laptop kernel: bbswitch: module verification failed: signature and/or required key missing - tainting kernel
Sep 30 09:57:42 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 09:57:42 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 09:57:42 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 09:57:42 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 09:57:42 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 30 09:59:56 suraj-laptop sudo[1936]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/modprobe bbswitch load_state=0 unload_state=1
Sep 30 10:00:16 suraj-laptop sudo[1942]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/tee /proc/acpi/bbswitch
Sep 30 10:00:16 suraj-laptop kernel: bbswitch: disabling discrete graphics
Sep 30 10:03:41 suraj-laptop sudo[2043]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/cat /proc/acpi/bbswitch
Sep 30 10:05:40 suraj-laptop sudo[2080]:    suraj : TTY=pts/1 ; PWD=/etc/modprobe.d ; USER=root ; COMMAND=/usr/bin/nano mv bumblebee.conf bbswitch.conf
Sep 30 10:06:03 suraj-laptop sudo[2086]:    suraj : TTY=pts/1 ; PWD=/etc/modprobe.d ; USER=root ; COMMAND=/usr/bin/mv bumblebee.conf bbswitch.conf
Sep 30 10:06:18 suraj-laptop sudo[2096]:    suraj : TTY=pts/1 ; PWD=/etc/modprobe.d ; USER=root ; COMMAND=/usr/bin/nano bbswitch.conf
Sep 30 10:09:01 suraj-laptop sudo[2123]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/tee /proc/acpi/bbswitch
Sep 30 10:09:01 suraj-laptop kernel: bbswitch: enabling discrete graphics
Sep 30 10:09:11 suraj-laptop sudo[2126]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/tee /proc/acpi/bbswitch
Sep 30 10:09:11 suraj-laptop kernel: bbswitch: disabling discrete graphics
Sep 30 10:10:19 suraj-laptop lightdm[771]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:10:19 suraj-laptop lightdm[771]: Setting GPU power to ON via bbswitch
Sep 30 10:10:19 suraj-laptop kernel: bbswitch: enabling discrete graphics
Sep 30 10:11:56 suraj-laptop prime-switch-boot[708]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:11:56 suraj-laptop prime-switch-boot[708]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 10:13:06 suraj-laptop sudo[1656]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/modprobe bbswitch
Sep 30 10:13:06 suraj-laptop kernel: bbswitch: loading out-of-tree module taints kernel.
Sep 30 10:13:06 suraj-laptop kernel: bbswitch: module verification failed: signature and/or required key missing - tainting kernel
Sep 30 10:13:06 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 10:13:06 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 10:13:06 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 10:13:06 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 10:13:06 suraj-laptop kernel: bbswitch: disabling discrete graphics
Sep 30 10:13:06 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is off
Sep 30 10:15:21 suraj-laptop dbus-daemon[1000]: [session uid=1000 pid=1000] Activating service name='ca.desrt.dconf' requested by ':1.47' (uid=1000 pid=1724 comm="mousepad /etc/modules-load.d/bbswitch ")
Sep 30 10:16:15 suraj-laptop sudo[1737]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/nano /etc/modules-load.d/bbswitch.conf
Sep 30 10:16:58 suraj-laptop sudo[1741]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/rm /etc/modules-load.d/bbswitch
Sep 30 10:17:53 suraj-laptop lightdm[770]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:17:53 suraj-laptop lightdm[770]: Setting GPU power to ON via bbswitch
Sep 30 10:17:53 suraj-laptop kernel: bbswitch: enabling discrete graphics
Sep 30 10:18:30 suraj-laptop kernel: bbswitch: loading out-of-tree module taints kernel.
Sep 30 10:18:30 suraj-laptop kernel: bbswitch: module verification failed: signature and/or required key missing - tainting kernel
Sep 30 10:18:30 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 10:18:30 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 10:18:30 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 10:18:30 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 10:18:30 suraj-laptop kernel: bbswitch: disabling discrete graphics
Sep 30 10:18:30 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is off
Sep 30 10:18:30 suraj-laptop systemd-modules-load[314]: Inserted module 'bbswitch'
Sep 30 10:18:32 suraj-laptop prime-switch-boot[694]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:18:32 suraj-laptop prime-switch-boot[694]: Setting GPU power to ON via bbswitch
Sep 30 10:18:32 suraj-laptop kernel: bbswitch: enabling discrete graphics
Sep 30 10:18:32 suraj-laptop prime-switch-boot[694]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 10:18:32 suraj-laptop kernel: bbswitch: Unloaded. Discrete card 0000:01:00.0 is on
Sep 30 10:21:30 suraj-laptop lightdm[775]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:21:30 suraj-laptop lightdm[775]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 10:21:53 suraj-laptop kernel: bbswitch: loading out-of-tree module taints kernel.
Sep 30 10:21:53 suraj-laptop kernel: bbswitch: module verification failed: signature and/or required key missing - tainting kernel
Sep 30 10:21:53 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 10:21:53 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 10:21:53 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 10:21:53 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 10:21:53 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 30 10:21:53 suraj-laptop systemd-modules-load[316]: Inserted module 'bbswitch'
Sep 30 10:21:54 suraj-laptop prime-switch-boot[464]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:21:54 suraj-laptop prime-switch-boot[464]: Setting GPU power to ON via bbswitch
Sep 30 10:21:54 suraj-laptop prime-switch-boot[464]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 10:21:54 suraj-laptop kernel: bbswitch: Unloaded. Discrete card 0000:01:00.0 is on
Sep 30 10:28:31 suraj-laptop sudo[1857]:    suraj : TTY=pts/1 ; PWD=/usr/lib/modules-load.d ; USER=root ; COMMAND=/usr/bin/nano /etc/modules-load.d/bbswitch.conf
Sep 30 10:28:57 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 10:28:57 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 10:28:57 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 10:28:57 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 10:28:57 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 30 10:30:12 suraj-laptop lightdm[738]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:30:12 suraj-laptop lightdm[738]: Setting GPU power to ON via bbswitch
Sep 30 10:30:12 suraj-laptop lightdm[738]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 10:30:12 suraj-laptop kernel: bbswitch: Unloaded. Discrete card 0000:01:00.0 is on
Sep 30 10:30:28 suraj-laptop kernel: bbswitch: loading out-of-tree module taints kernel.
Sep 30 10:30:28 suraj-laptop kernel: bbswitch: module verification failed: signature and/or required key missing - tainting kernel
Sep 30 10:30:28 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 10:30:28 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 10:30:28 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 10:30:28 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 10:30:28 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 30 10:30:28 suraj-laptop systemd-modules-load[316]: Inserted module 'bbswitch'
Sep 30 10:30:30 suraj-laptop prime-switch-boot[451]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:30:30 suraj-laptop prime-switch-boot[451]: Setting GPU power to ON via bbswitch
Sep 30 10:30:30 suraj-laptop prime-switch-boot[451]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 10:30:30 suraj-laptop kernel: bbswitch: Unloaded. Discrete card 0000:01:00.0 is on
Sep 30 10:35:19 suraj-laptop lightdm[807]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:35:19 suraj-laptop lightdm[807]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 10:35:35 suraj-laptop kernel: bbswitch: loading out-of-tree module taints kernel.
Sep 30 10:35:35 suraj-laptop kernel: bbswitch: module verification failed: signature and/or required key missing - tainting kernel
Sep 30 10:35:35 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 10:35:35 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 10:35:35 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 10:35:35 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 10:35:35 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 30 10:35:35 suraj-laptop systemd-modules-load[317]: Inserted module 'bbswitch'
Sep 30 10:35:36 suraj-laptop prime-switch-boot[500]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:35:36 suraj-laptop prime-switch-boot[500]: Setting GPU power to ON via bbswitch
Sep 30 10:35:36 suraj-laptop prime-switch-boot[500]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 10:35:36 suraj-laptop kernel: bbswitch: Unloaded. Discrete card 0000:01:00.0 is on
Sep 30 10:37:19 suraj-laptop lightdm[793]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:37:19 suraj-laptop lightdm[793]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 10:39:02 suraj-laptop lightdm[793]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:39:03 suraj-laptop lightdm[793]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 10:39:30 suraj-laptop sudo[3101]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/modprobe bbswitch
Sep 30 10:39:30 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 10:39:30 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 10:39:30 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 10:39:30 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 10:39:30 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 30 10:40:14 suraj-laptop sudo[3155]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/tee /proc/acpi/bbswitch
Sep 30 10:40:14 suraj-laptop kernel: bbswitch: disabling discrete graphics
Sep 30 10:43:33 suraj-laptop sudo[3181]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/pacman -Ss bbswitch
Sep 30 10:43:45 suraj-laptop sudo[3184]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/pacman -S bbswitch-dkms
Sep 30 10:47:00 suraj-laptop sudo[3306]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/pacman -Rn bbswitch-dkms
Sep 30 10:47:11 suraj-laptop sudo[3322]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/pacman -S bbswitch
Sep 30 10:48:17 suraj-laptop sudo[3378]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/modprobe bbswitch
Sep 30 10:49:12 suraj-laptop sudo[3420]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/nano /etc/modprobe.d/bbswitch.conf
Sep 30 10:49:56 suraj-laptop sudo[3441]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/modprobe bbswitch load_state=1
Sep 30 10:52:33 suraj-laptop sudo[3463]:    suraj : TTY=pts/0 ; PWD=/home/suraj ; USER=root ; COMMAND=/usr/bin/nano /etc/modprobe.d/bbswitch.conf
Sep 30 10:53:31 suraj-laptop lightdm[793]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:53:32 suraj-laptop lightdm[793]: Setting GPU power to ON via bbswitch
Sep 30 10:53:32 suraj-laptop kernel: bbswitch: enabling discrete graphics
Sep 30 10:53:32 suraj-laptop lightdm[793]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 10:53:32 suraj-laptop systemd-udevd[329]: libkmod: kmod_config_parse: /etc/modprobe.d/bbswitch.conf line 1: ignoring bad line starting with 'bbswitch'
Sep 30 10:53:32 suraj-laptop kernel: bbswitch: Unloaded. Discrete card 0000:01:00.0 is on
Sep 30 10:54:10 suraj-laptop kernel: bbswitch: loading out-of-tree module taints kernel.
Sep 30 10:54:10 suraj-laptop kernel: bbswitch: module verification failed: signature and/or required key missing - tainting kernel
Sep 30 10:54:10 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 10:54:10 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 10:54:10 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 10:54:10 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 10:54:10 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 30 10:54:10 suraj-laptop systemd-modules-load[316]: Inserted module 'bbswitch'
Sep 30 10:54:10 suraj-laptop systemd-modules-load[316]: libkmod: kmod_config_parse: /etc/modprobe.d/bbswitch.conf line 1: ignoring bad line starting with 'bbswitch'
Sep 30 10:54:11 suraj-laptop systemd-udevd[329]: libkmod: kmod_config_parse: /etc/modprobe.d/bbswitch.conf line 1: ignoring bad line starting with 'bbswitch'
Sep 30 10:54:11 suraj-laptop modprobe[623]: libkmod: kmod_config_parse: /etc/modprobe.d/bbswitch.conf line 1: ignoring bad line starting with 'bbswitch'
Sep 30 10:54:12 suraj-laptop prime-switch-boot[620]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 10:54:12 suraj-laptop prime-switch-boot[620]: Setting GPU power to ON via bbswitch
Sep 30 10:54:12 suraj-laptop prime-switch-boot[620]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 10:54:12 suraj-laptop kernel: bbswitch: Unloaded. Discrete card 0000:01:00.0 is on
Sep 30 11:03:16 suraj-laptop lightdm[767]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 11:03:16 suraj-laptop lightdm[767]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 11:03:31 suraj-laptop kernel: bbswitch: loading out-of-tree module taints kernel.
Sep 30 11:03:31 suraj-laptop kernel: bbswitch: module verification failed: signature and/or required key missing - tainting kernel
Sep 30 11:03:31 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 11:03:31 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 11:03:31 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 11:03:31 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 11:03:31 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 30 11:03:31 suraj-laptop systemd-modules-load[315]: Inserted module 'bbswitch'
Sep 30 11:03:31 suraj-laptop systemd-modules-load[315]: libkmod: kmod_config_parse: /etc/modprobe.d/bbswitch.conf line 1: ignoring bad line starting with 'bbswitch'
Sep 30 11:03:31 suraj-laptop systemd-udevd[326]: libkmod: kmod_config_parse: /etc/modprobe.d/bbswitch.conf line 1: ignoring bad line starting with 'bbswitch'
Sep 30 12:19:33 suraj-laptop kernel: bbswitch: loading out-of-tree module taints kernel.
Sep 30 12:19:33 suraj-laptop kernel: bbswitch: module verification failed: signature and/or required key missing - tainting kernel
Sep 30 12:19:33 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 12:19:33 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 12:19:33 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 12:19:33 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 12:19:33 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 30 12:19:33 suraj-laptop systemd-modules-load[316]: Inserted module 'bbswitch'
Sep 30 12:19:33 suraj-laptop systemd-modules-load[316]: libkmod: kmod_config_parse: /etc/modprobe.d/bbswitch.conf line 1: ignoring bad line starting with 'bbswitch'
Sep 30 12:19:33 suraj-laptop systemd-udevd[327]: libkmod: kmod_config_parse: /etc/modprobe.d/bbswitch.conf line 1: ignoring bad line starting with 'bbswitch'
Sep 30 12:19:33 suraj-laptop modprobe[472]: libkmod: kmod_config_parse: /etc/modprobe.d/bbswitch.conf line 1: ignoring bad line starting with 'bbswitch'
Sep 30 12:19:34 suraj-laptop prime-switch-boot[471]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 12:19:34 suraj-laptop prime-switch-boot[471]: Setting GPU power to ON via bbswitch
Sep 30 12:19:34 suraj-laptop prime-switch-boot[471]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 12:19:34 suraj-laptop kernel: bbswitch: Unloaded. Discrete card 0000:01:00.0 is on
Sep 30 12:23:16 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 12:23:16 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 12:23:16 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 12:23:16 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 12:23:16 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 30 12:24:15 suraj-laptop dbus-daemon[975]: [session uid=1000 pid=975] Activating service name='ca.desrt.dconf' requested by ':1.58' (uid=1000 pid=1919 comm="mousepad /etc/modprobe.d/bbswitch.conf ")
Sep 30 12:25:06 suraj-laptop lightdm[788]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 12:25:06 suraj-laptop lightdm[788]: Setting GPU power to ON via bbswitch
Sep 30 12:25:06 suraj-laptop lightdm[788]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 12:25:06 suraj-laptop kernel: bbswitch: Unloaded. Discrete card 0000:01:00.0 is on
Sep 30 12:25:24 suraj-laptop kernel: bbswitch: loading out-of-tree module taints kernel.
Sep 30 12:25:24 suraj-laptop kernel: bbswitch: module verification failed: signature and/or required key missing - tainting kernel
Sep 30 12:25:24 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 12:25:24 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 12:25:24 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 12:25:24 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 12:25:24 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 30 12:25:24 suraj-laptop systemd-modules-load[320]: Inserted module 'bbswitch'
Sep 30 12:25:25 suraj-laptop prime-switch-boot[481]: Available kernel modules : ['nouveau', 'bbswitch', 'nvidia', 'nvidia_drm', 'nvidia_modeset']
Sep 30 12:25:25 suraj-laptop prime-switch-boot[481]: Setting GPU power to ON via bbswitch
Sep 30 12:25:25 suraj-laptop prime-switch-boot[481]: Unloading modules ['bbswitch'] (if loaded)
Sep 30 12:25:25 suraj-laptop kernel: bbswitch: Unloaded. Discrete card 0000:01:00.0 is on
Sep 30 12:26:04 suraj-laptop kernel: bbswitch: version 0.8
Sep 30 12:26:04 suraj-laptop kernel: bbswitch: Found integrated VGA device 0000:00:02.0: \_SB_.PCI0.GFX0
Sep 30 12:26:04 suraj-laptop kernel: bbswitch: Found discrete VGA device 0000:01:00.0: \_SB_.PCI0.PEG0.PEGP
Sep 30 12:26:04 suraj-laptop kernel: bbswitch: detected an Optimus _DSM function
Sep 30 12:26:04 suraj-laptop kernel: bbswitch: Succesfully loaded. Discrete card 0000:01:00.0 is on
Sep 30 12:26:13 suraj-laptop kernel: bbswitch: disabling discrete graphics

[eviltak]

I'm facing the same problem. bbswitch unloads itself when started via /etc/modules-load.d/, but stays loaded (and is able to turn the card on/off) when loaded manually via modprobe.

[surajrv6]

Hmm, I think maybe it is kernel related issue? Yesterday, I installed debian buster stable with kernel 4.19. Same problem except the nvidia card was not turning off in debian. I bypassed the laptop hanging issue by putting bbswitch load_state=0 in modprobe.d (instructions from bbswitch github main page) Didnt try Debian testing 5.0 kernel..