5.11.0-rc1 Building

[sickcodes]

Ready and able to test!

origin/devel

[user@hostname evdi]$ make
CFLAGS="-Werror -Wextra -Wall -Wmissing-prototypes -Wstrict-prototypes -Wno-error=missing-field-initializers " make -C module 
make[1]: Entering directory './evdi/module'
make -C /lib/modules/5.11.0-rc1-1-git-00073-g3516bd729358/build M=$PWD
make[2]: Entering directory '/usr/lib/modules/5.11.0-rc1-1-git-00073-g3516bd729358/build'
  CC [M]  ./evdi/module/evdi_modeset.o
./evdi/module/evdi_modeset.c:163:20: error: initialization of ‘void (*)(struct drm_crtc *, struct drm_atomic_state *)’ from incompatible pointer type ‘void (*)(struct drm_crtc *, struct drm_crtc_state *)’ [-Werror=incompatible-pointer-types]
  163 |  .atomic_flush   = evdi_crtc_atomic_flush,
      |                    ^~~~~~~~~~~~~~~~~~~~~~
./evdi/module/evdi_modeset.c:163:20: note: (near initialization for ‘evdi_helper_funcs.atomic_flush’)
cc1: all warnings being treated as errors
make[3]: *** [scripts/Makefile.build:279: ./evdi/module/evdi_modeset.o] Error 1
make[2]: *** [Makefile:1805: ./evdi/module] Error 2
make[2]: Leaving directory '/usr/lib/modules/5.11.0-rc1-1-git-00073-g3516bd729358/build'
make[1]: *** [Makefile:77: module] Error 2
make[1]: Leaving directory './evdi/module'
make: *** [Makefile:8: all] Error 2

origin/v1.7.x

[user@hostname evdi]$ make
CFLAGS="-Werror -Wextra -Wall -Wmissing-prototypes -Wstrict-prototypes -Wno-error=missing-field-initializers" make -C module 
make[1]: Entering directory './evdi/module'
cat: /etc/redhat-release: No such file or directory
make -C /lib/modules/5.11.0-rc1-1-git-00073-g3516bd729358/build M=$PWD
make[2]: Entering directory '/usr/lib/modules/5.11.0-rc1-1-git-00073-g3516bd729358/build'
cat: /etc/redhat-release: No such file or directory
  CC [M]  ./evdi/module/evdi_drv.o
./evdi/module/evdi_drv.c:90:3: error: ‘struct drm_driver’ has no member named ‘preclose’; did you mean ‘postclose’?
   90 |  .preclose = evdi_driver_preclose,
      |   ^~~~~~~~
      |   postclose
./evdi/module/evdi_drv.c:90:14: error: initialization of ‘void (*)(struct drm_device *)’ from incompatible pointer type ‘void (*)(struct drm_device *, struct drm_file *)’ [-Werror=incompatible-pointer-types]
   90 |  .preclose = evdi_driver_preclose,
      |              ^~~~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:90:14: note: (near initialization for ‘driver.release’)
./evdi/module/evdi_drv.c:96:3: error: ‘struct drm_driver’ has no member named ‘gem_free_object_unlocked’
   96 |  .gem_free_object_unlocked = evdi_gem_free_object,
      |   ^~~~~~~~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:96:30: error: initialization of ‘void (*)(struct drm_device *)’ from incompatible pointer type ‘void (*)(struct drm_gem_object *)’ [-Werror=incompatible-pointer-types]
   96 |  .gem_free_object_unlocked = evdi_gem_free_object,
      |                              ^~~~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:96:30: note: (near initialization for ‘driver.lastclose’)
./evdi/module/evdi_drv.c:100:3: error: ‘struct drm_driver’ has no member named ‘gem_vm_ops’
  100 |  .gem_vm_ops = &evdi_gem_vm_ops,
      |   ^~~~~~~~~~
./evdi/module/evdi_drv.c:100:16: error: initialization of ‘void (*)(struct drm_device *)’ from incompatible pointer type ‘const struct vm_operations_struct *’ [-Werror=incompatible-pointer-types]
  100 |  .gem_vm_ops = &evdi_gem_vm_ops,
      |                ^
./evdi/module/evdi_drv.c:100:16: note: (near initialization for ‘driver.unload’)
./evdi/module/evdi_drv.c:100:16: error: initialized field overwritten [-Werror=override-init]
./evdi/module/evdi_drv.c:100:16: note: (near initialization for ‘driver.unload’)
./evdi/module/evdi_drv.c:114:3: error: ‘struct drm_driver’ has no member named ‘gem_prime_export’; did you mean ‘gem_prime_import’?
  114 |  .gem_prime_export = drm_gem_prime_export,
      |   ^~~~~~~~~~~~~~~~
      |   gem_prime_import
./evdi/module/evdi_drv.c:114:22: error: initialization of ‘int (*)(struct drm_device *, struct drm_file *, int,  uint32_t *)’ {aka ‘int (*)(struct drm_device *, struct drm_file *, int,  unsigned int *)’} from incompatible pointer type ‘struct dma_buf * (*)(struct drm_gem_object *, int)’ [-Werror=incompatible-pointer-types]
  114 |  .gem_prime_export = drm_gem_prime_export,
      |                      ^~~~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:114:22: note: (near initialization for ‘driver.prime_fd_to_handle’)
./evdi/module/evdi_drv.c:114:22: error: initialized field overwritten [-Werror=override-init]
./evdi/module/evdi_drv.c:114:22: note: (near initialization for ‘driver.prime_fd_to_handle’)
./evdi/module/evdi_drv.c:115:3: error: ‘struct drm_driver’ has no member named ‘gem_prime_get_sg_table’; did you mean ‘gem_prime_import_sg_table’?
  115 |  .gem_prime_get_sg_table = evdi_prime_get_sg_table,
      |   ^~~~~~~~~~~~~~~~~~~~~~
      |   gem_prime_import_sg_table
./evdi/module/evdi_drv.c:115:28: error: initialization of ‘struct drm_gem_object * (*)(struct drm_device *, struct dma_buf *)’ from incompatible pointer type ‘struct sg_table * (*)(struct drm_gem_object *)’ [-Werror=incompatible-pointer-types]
  115 |  .gem_prime_get_sg_table = evdi_prime_get_sg_table,
      |                            ^~~~~~~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:115:28: note: (near initialization for ‘driver.gem_prime_import’)
./evdi/module/evdi_drv.c:115:28: error: initialized field overwritten [-Werror=override-init]
./evdi/module/evdi_drv.c:115:28: note: (near initialization for ‘driver.gem_prime_import’)
./evdi/module/evdi_drv.c:118:3: error: ‘struct drm_driver’ has no member named ‘enable_vblank’
  118 |  .enable_vblank = evdi_enable_vblank,
      |   ^~~~~~~~~~~~~
./evdi/module/evdi_drv.c:118:19: error: initialization of ‘int (*)(struct drm_gem_object *, struct vm_area_struct *)’ from incompatible pointer type ‘int (*)(struct drm_device *, unsigned int)’ [-Werror=incompatible-pointer-types]
  118 |  .enable_vblank = evdi_enable_vblank,
      |                   ^~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:118:19: note: (near initialization for ‘driver.gem_prime_mmap’)
./evdi/module/evdi_drv.c:119:3: error: ‘struct drm_driver’ has no member named ‘disable_vblank’
  119 |  .disable_vblank = evdi_disable_vblank,
      |   ^~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:119:20: error: initialization of ‘int (*)(struct drm_file *, struct drm_device *, struct drm_mode_create_dumb *)’ from incompatible pointer type ‘void (*)(struct drm_device *, unsigned int)’ [-Werror=incompatible-pointer-types]
  119 |  .disable_vblank = evdi_disable_vblank,
      |                    ^~~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:119:20: note: (near initialization for ‘driver.dumb_create’)
./evdi/module/evdi_drv.c:119:20: error: initialized field overwritten [-Werror=override-init]
./evdi/module/evdi_drv.c:119:20: note: (near initialization for ‘driver.dumb_create’)
cc1: all warnings being treated as errors
make[3]: *** [scripts/Makefile.build:279: ./evdi/module/evdi_drv.o] Error 1
make[2]: *** [Makefile:1805: ./evdi/module] Error 2
make[2]: Leaving directory '/usr/lib/modules/5.11.0-rc1-1-git-00073-g3516bd729358/build'
make[1]: *** [Makefile:77: module] Error 2
make[1]: Leaving directory './evdi/module'
make: *** [Makefile:8: all] Error 2

origin/master

[user@hostname evdi]$ make
CFLAGS="-Werror -Wextra -Wall -Wmissing-prototypes -Wstrict-prototypes -Wno-error=missing-field-initializers" make -C module 
make[1]: Entering directory './evdi/module'
make -C /lib/modules/5.11.0-rc1-1-git-00073-g3516bd729358/build M=$PWD
make[2]: Entering directory '/usr/lib/modules/5.11.0-rc1-1-git-00073-g3516bd729358/build'
  CC [M]  ./evdi/module/evdi_drv.o
./evdi/module/evdi_drv.c:87:3: error: ‘struct drm_driver’ has no member named ‘preclose’; did you mean ‘postclose’?
   87 |  .preclose = evdi_driver_preclose,
      |   ^~~~~~~~
      |   postclose
./evdi/module/evdi_drv.c:87:14: error: initialization of ‘void (*)(struct drm_device *)’ from incompatible pointer type ‘void (*)(struct drm_device *, struct drm_file *)’ [-Werror=incompatible-pointer-types]
   87 |  .preclose = evdi_driver_preclose,
      |              ^~~~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:87:14: note: (near initialization for ‘driver.release’)
./evdi/module/evdi_drv.c:92:3: error: ‘struct drm_driver’ has no member named ‘gem_free_object’; did you mean ‘gem_create_object’?
   92 |  .gem_free_object = evdi_gem_free_object,
      |   ^~~~~~~~~~~~~~~
      |   gem_create_object
./evdi/module/evdi_drv.c:92:21: error: initialization of ‘void (*)(struct drm_device *)’ from incompatible pointer type ‘void (*)(struct drm_gem_object *)’ [-Werror=incompatible-pointer-types]
   92 |  .gem_free_object = evdi_gem_free_object,
      |                     ^~~~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:92:21: note: (near initialization for ‘driver.lastclose’)
./evdi/module/evdi_drv.c:93:3: error: ‘struct drm_driver’ has no member named ‘gem_vm_ops’
   93 |  .gem_vm_ops = &evdi_gem_vm_ops,
      |   ^~~~~~~~~~
./evdi/module/evdi_drv.c:93:16: error: initialization of ‘void (*)(struct drm_device *)’ from incompatible pointer type ‘const struct vm_operations_struct *’ [-Werror=incompatible-pointer-types]
   93 |  .gem_vm_ops = &evdi_gem_vm_ops,
      |                ^
./evdi/module/evdi_drv.c:93:16: note: (near initialization for ‘driver.unload’)
./evdi/module/evdi_drv.c:93:16: error: initialized field overwritten [-Werror=override-init]
./evdi/module/evdi_drv.c:93:16: note: (near initialization for ‘driver.unload’)
./evdi/module/evdi_drv.c:107:3: error: ‘struct drm_driver’ has no member named ‘gem_prime_export’; did you mean ‘gem_prime_import’?
  107 |  .gem_prime_export = drm_gem_prime_export,
      |   ^~~~~~~~~~~~~~~~
      |   gem_prime_import
./evdi/module/evdi_drv.c:107:22: error: initialization of ‘int (*)(struct drm_device *, struct drm_file *, int,  uint32_t *)’ {aka ‘int (*)(struct drm_device *, struct drm_file *, int,  unsigned int *)’} from incompatible pointer type ‘struct dma_buf * (*)(struct drm_gem_object *, int)’ [-Werror=incompatible-pointer-types]
  107 |  .gem_prime_export = drm_gem_prime_export,
      |                      ^~~~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:107:22: note: (near initialization for ‘driver.prime_fd_to_handle’)
./evdi/module/evdi_drv.c:107:22: error: initialized field overwritten [-Werror=override-init]
./evdi/module/evdi_drv.c:107:22: note: (near initialization for ‘driver.prime_fd_to_handle’)
./evdi/module/evdi_drv.c:108:3: error: ‘struct drm_driver’ has no member named ‘gem_prime_get_sg_table’; did you mean ‘gem_prime_import_sg_table’?
  108 |  .gem_prime_get_sg_table = evdi_prime_get_sg_table,
      |   ^~~~~~~~~~~~~~~~~~~~~~
      |   gem_prime_import_sg_table
./evdi/module/evdi_drv.c:108:28: error: initialization of ‘struct drm_gem_object * (*)(struct drm_device *, struct dma_buf *)’ from incompatible pointer type ‘struct sg_table * (*)(struct drm_gem_object *)’ [-Werror=incompatible-pointer-types]
  108 |  .gem_prime_get_sg_table = evdi_prime_get_sg_table,
      |                            ^~~~~~~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:108:28: note: (near initialization for ‘driver.gem_prime_import’)
./evdi/module/evdi_drv.c:108:28: error: initialized field overwritten [-Werror=override-init]
./evdi/module/evdi_drv.c:108:28: note: (near initialization for ‘driver.gem_prime_import’)
./evdi/module/evdi_drv.c:111:3: error: ‘struct drm_driver’ has no member named ‘enable_vblank’
  111 |  .enable_vblank = evdi_enable_vblank,
      |   ^~~~~~~~~~~~~
./evdi/module/evdi_drv.c:111:19: error: initialization of ‘int (*)(struct drm_gem_object *, struct vm_area_struct *)’ from incompatible pointer type ‘int (*)(struct drm_device *, unsigned int)’ [-Werror=incompatible-pointer-types]
  111 |  .enable_vblank = evdi_enable_vblank,
      |                   ^~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:111:19: note: (near initialization for ‘driver.gem_prime_mmap’)
./evdi/module/evdi_drv.c:112:3: error: ‘struct drm_driver’ has no member named ‘disable_vblank’
  112 |  .disable_vblank = evdi_disable_vblank,
      |   ^~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:112:20: error: initialization of ‘int (*)(struct drm_file *, struct drm_device *, struct drm_mode_create_dumb *)’ from incompatible pointer type ‘void (*)(struct drm_device *, unsigned int)’ [-Werror=incompatible-pointer-types]
  112 |  .disable_vblank = evdi_disable_vblank,
      |                    ^~~~~~~~~~~~~~~~~~~
./evdi/module/evdi_drv.c:112:20: note: (near initialization for ‘driver.dumb_create’)
./evdi/module/evdi_drv.c:112:20: error: initialized field overwritten [-Werror=override-init]
./evdi/module/evdi_drv.c:112:20: note: (near initialization for ‘driver.dumb_create’)
./evdi/module/evdi_drv.c: In function ‘evdi_platform_probe’:
./evdi/module/evdi_drv.c:173:20: error: ‘struct dev_archdata’ has no member named ‘iommu’
  173 |  pdev->dev.archdata.iommu = INTEL_IOMMU_DUMMY_DOMAIN;
      |                    ^
cc1: all warnings being treated as errors
make[3]: *** [scripts/Makefile.build:279: ./evdi/module/evdi_drv.o] Error 1
make[2]: *** [Makefile:1805: ./evdi/module] Error 2
make[2]: Leaving directory '/usr/lib/modules/5.11.0-rc1-1-git-00073-g3516bd729358/build'
make[1]: *** [Makefile:71: module] Error 2
make[1]: Leaving directory './evdi/module'
make: *** [Makefile:8: all] Error 2

[rockorequin]

Re the compile error listed above in evdi_modeset.c for the origin/devel branch, what's happened is that the atomic_flush has changed to pass struct drm_atomic_state *state instead of struct drm_crtc_state *old_state, so I think evdi_modeset.c just needs changing to something like this:

static void evdi_crtc_atomic_flush(
	struct drm_crtc *crtc
#if KERNEL_VERSION(5, 11, 0) >= LINUX_VERSION_CODE
	, __always_unused struct drm_atomic_state *old_state
#else
	, __always_unused struct drm_crtc_state *old_state
#endif
	)

butt when I try to compile 5.11-rc2, I still get all the other errors listed above for the origin/1.7.x branch.

[sickcodes]

Thank you @rockorequin I will your snippet shortly!

[rockorequin]

@sickcodes No problems!

For the other errors, it looks like the last two commits to drm_drv.h are what broke things:

commit 57bb1ee6034046be70aed33fd6d447bb2b7261fa
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Wed Nov 4 11:04:21 2020 +0100

    drm: Compile out legacy chunks from struct drm_device

You can get around this by enabling CONFIG_DRM_LEGACY in the Makefile ccflags:

ccflags-y := -Iinclude/drm -DCONFIG_DRM_LEGACY

With the above change, the errors about preclose and enable_vblank/disable_vblank disappear for me. But I still get errors about the GEM and PRIME callbacks due to this commit:

commit d693def4fd1c23f1ca5aed1afb9993b3a2069ad2
Author: Thomas Zimmermann <tzimmermann@suse.de>
Date:   Wed Sep 23 12:21:59 2020 +0200

    drm: Remove obsolete GEM and PRIME callbacks from struct drm_driver
    
    Several GEM and PRIME callbacks have been deprecated in favor of
    per-instance GEM object functions. Remove the callbacks as they are
    now unused. The only exception is .gem_prime_mmap, which is still
    in use by several drivers.
    
    What is also gone is gem_vm_ops in struct drm_driver. All drivers now
    use struct drm_gem_object_funcs.vm_ops instead.
 

and that looks like a more complicated fix.

[rockorequin]

I got evdi to build with 5.11-rc2 using the patch at https://gist.github.com/rockorequin/f3047e748bcba9be9d1fff06f472dbda, but I haven't got a DisplayLink monitor atm to test it with.

The patch cheats by using the CONFIG_DRM_LEGACY define in the Makefile so that I didn't have to remap the vblank etc function callbacks.

[sickcodes]

Thanks @rockorequin, builds perfect on devel branch!

git clone https://github.com/DisplayLink/evdi.git && cd evdi
git checkout -f devel
curl "https://gist.githubusercontent.com/rockorequin/f3047e748bcba9be9d1fff06f472dbda/raw/93b4792bb11ffe0a77973a6335d3e5c751dcf053/evdi-devel-5.11-rc2.patch"
git apply --verbose --ignore-whitespace evdi-devel-5.11-rc2.patch
make # && sudo make install

Did you want to write the PR?

I also had to add -DCONFIG_DRM_LEGACY to line 44 for kbuild, in addition to the dkms build which your patch fixed.
e.g.
ccflags-y := -isystem include/drm $(CFLAGS) $(EL8FLAG)
ccflags-y := -isystem include/drm $(CFLAGS) $(EL8FLAG) -DCONFIG_DRM_LEGACY

Even though I have two displaylink things, I also cannot test 1.9 as we're still on 1.7.x.

I think we will also need to cherry-pick the fix to 1.7.x, I will attempt that now with your fix!

[sickcodes]

Not sure if it works yet tho, no screen activity on 1.7.x with 5.11rc2 but I'll poke around with starting/stopping the service, maybe @abucodonosor might know something.

[sickcodes]

Is it the #elsif statement?

Should that be #elif?

https://gist.github.com/rockorequin/f3047e748bcba9be9d1fff06f472dbda#file-evdi-devel-5-11-rc2-patch-L49

[elguero]

@sickcodes Thanks for your help, contribution and enthusiasm. Did @rockorequin give the go ahead to submit his patch as a PR? I think I missed that somewhere. Just trying to put myself in his place, unless he said to go for it.

The current kernel 5.11 release candidate is only the second one. It would be nice if someone could test this on actual hardware since all that appears to have been done are compile tests.

Just my 2 cents. It is great to see the contributions from the community to hopefully help keep us from falling behind again with new kernel releases.

[abucodonosor]

@rockorequin

the accepted syntax for this module is:

#if KERNEL_VERSION(X, Y, Z) <= LINUX_VERSION_CODE

so the logic is swapped :).

I didn't looked what changed bc a big batch of DRM stuff will hit rc3++, but those defines lin your patch look wrong to me.

[abucodonosor]

Not sure if it works yet tho, no screen activity on 1.7.x with 5.11rc2 but I'll poke around with starting/stopping the service, maybe @abucodonosor might know something.

Unfortunately, I don't have any time to look at this right now. I may have some time next week.

[sickcodes]

Sorry ya'll, I already committed it locally and was only 1 click away from a PR so I pushed it anyway.

Can confirm 1.7.x doesn't run yet with the changes above on two DisplayLink hardware devices. I will triple check if I have made an error and I think I have.

How can I check why it won't run?

[microhobby]

I tried the patch from @rockorequin with your instructions @sickcodes, but no success yet. I'm getting this on dmesg:

[    3.195586] evdi: loading out-of-tree module taints kernel.
[    3.197004] evdi: module verification failed: signature and/or required key missing - tainting kernel
[    3.197519] evdi: [I] Initialising logging on level 5
[    3.197521] evdi: [I] Atomic driver: yes
[    3.197558] evdi: [D] evdi_platform_add_devices:145 Increasing device count to 4
[    3.197642] evdi: [D] evdi_crtc_init:394 drm_crtc_init: 0 p00000000cb1b80e7
[    3.197652] evdi: [D] evdi_detect:94 (dev=0) poll connector state: disconnected
[    3.197658] evdi evdi.0: [drm] Cannot find any crtc or sizes
[    3.197668] evdi: [W] evdi_painter_send_update_ready_if_needed:706 Painter does not exist!
[    3.198780] [drm] Initialized evdi 1.9.0 20201210 for evdi.0 on minor 0
[    3.198800] evdi: [I] Evdi platform_device create
[    3.254690] evdi: [D] evdi_detect:94 (dev=0) poll connector state: disconnected
[    3.254716] evdi: [D] evdi_driver_postclose:234 (dev=0) Process tries to close us, postclose
[    3.254718] evdi: [I] Task 396 (plymouthd) of process 396 (plymouthd)
[    3.354205] evdi: [D] evdi_detect:94 (dev=0) poll connector state: disconnected
[    3.354227] evdi: [D] evdi_driver_postclose:234 (dev=0) Process tries to close us, postclose
[    3.354230] evdi: [I] Task 396 (plymouthd) of process 396 (plymouthd)
[    4.856145] evdi: [D] evdi_detect:94 (dev=0) poll connector state: disconnected
[    4.856164] evdi: [D] evdi_driver_postclose:234 (dev=0) Process tries to close us, postclose
[    4.856167] evdi: [I] Task 396 (plymouthd) of process 396 (plymouthd)
[    5.402913] evdi: [D] evdi_driver_postclose:234 (dev=0) Process tries to close us, postclose
[    5.402917] evdi: [I] Task 641 (gpu-manager) of process 641 (gpu-manager)
[    5.402953] evdi: [D] evdi_driver_postclose:234 (dev=0) Process tries to close us, postclose
[    5.402955] evdi: [I] Task 641 (gpu-manager) of process 641 (gpu-manager)
[    5.403008] evdi: [D] evdi_driver_postclose:234 (dev=0) Process tries to close us, postclose
[    5.403010] evdi: [I] Task 641 (gpu-manager) of process 641 (gpu-manager)
[    6.471511] evdi: [D] evdi_detect:94 (dev=0) poll connector state: disconnected
[    7.926715] Modules linked in: uvcvideo(+) rtsx_usb videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 uas ecdh_generic videobuf2_common videodev ecc usb_storage snd_hda_codec_hdmi snd_seq_dummy snd_hrtimer snd_usb_audio snd_usbmidi_lib usbhid mc intel_rapl_msr intel_rapl_common x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio coretemp ath10k_pci snd_hda_intel ath10k_core snd_intel_dspcfg snd_hda_codec snd_hda_core kvm_intel snd_hwdep overlay kvm ath snd_pcm snd_seq_midi joydev snd_seq_midi_event crct10dif_pclmul nouveau binfmt_misc mac80211 mei_hdcp snd_rawmidi ghash_clmulni_intel aesni_intel snd_seq nls_iso8859_1 crypto_simd input_leds cryptd glue_helper snd_seq_device snd_timer drm_ttm_helper rapl i915 cfg80211 intel_cstate snd serio_raw ttm efi_pstore soundcore mei_me mxm_wmi ee1004 mei libarc4 hid_multitouch intel_pch_thermal i2c_algo_bit acpi_tad mac_hid acpi_pad sch_fq_codel evdi(OE) drm_kms_helper cec rc_core drm fb_sys_fops
[    8.259156] evdi: [D] evdi_painter_dpms_notify:715 (dev=0) Notifying dpms mode: 3
[    8.259161] evdi: [W] evdi_painter_send_event:321 Painter is not connected!
[   29.691976] evdi: [D] evdi_driver_postclose:234 (dev=0) Process tries to close us, postclose
[   29.691980] evdi: [I] Task 1939 (Xorg.wrap) of process 1939 (Xorg.wrap)
[   29.872282] evdi: [D] evdi_detect:94 (dev=0) poll connector state: disconnected
[   29.872342] evdi: [D] evdi_painter_framebuffer_size:594 Scanout buffer not set.
[   29.872344] evdi: [D] evdi_painter_mark_dirty:621 (dev=0) Skip clip rect. Scanout buffer not set.
[   29.872352] evdi: [D] evdi_detect:94 (dev=0) poll connector state: disconnected
[   30.131851] evdi: [D] evdi_painter_dpms_notify:715 (dev=0) Notifying dpms mode: 3
[   30.131855] evdi: [W] evdi_painter_send_event:321 Painter is not connected!
[   30.352443] evdi: [D] evdi_painter_dpms_notify:715 (dev=0) Notifying dpms mode: 3
[   30.352447] evdi: [W] evdi_painter_send_event:321 Painter is not connected!
[   30.921058] evdi: [D] evdi_detect:94 (dev=0) poll connector state: disconnected
[   32.213576] evdi: [D] evdi_detect:94 (dev=0) poll connector state: disconnected
[   33.732400] evdi: [D] evdi_driver_postclose:234 (dev=0) Process tries to close us, postclose
[   33.732404] evdi: [I] Task 1 (systemd) of process 1 (systemd)
[   76.206256] evdi: [D] evdi_detect:94 (dev=0) poll connector state: disconnected
[  127.881311] evdi: [D] evdi_detect:94 (dev=0) poll connector state: disconnected

Something new about this?

[microhobby]

Ok, I figure out that the DisplayLinkManager was not running.
Now I have the screen receiving signal, but no image all black.