Spontaneously stopped working [Arch]

[lyiriyah]

/sys/class/leds/asus::screenpad/brightness exists, but writing to it has no effect. Occurs on 5.18.12 and 5.18.10. The /lib/modules/5.18.{10,12}/extra folders are empty, which is odd...

The modules are also zst-compressed, could that be an issue?

lsmod | grep asus:

asus_nb_wmi            28672  0
asus_wmi               73728  1 asus_nb_wmi
sparse_keymap          16384  1 asus_wmi
platform_profile       16384  1 asus_wmi
rfkill                 36864  7 iwlmvm,asus_wmi,bluetooth,cfg80211
video                  57344  2 asus_wmi,i915
wmi                    45056  3 asus_wmi,wmi_bmof,mxm_wmi
i8042                  45056  1 asus_nb_wmi

dmesg | grep asus:

[    2.036322] asus_wmi: ASUS WMI generic driver loaded
[    2.038037] asus_wmi: Initialization: 0x1
[    2.038103] asus_wmi: BIOS WMI version: 9.0
[    2.038146] asus_wmi: SFUN value: 0x21
[    2.038149] asus-nb-wmi asus-nb-wmi: Detected ATK, not ASUSWMI, use DSTS
[    2.038152] asus-nb-wmi asus-nb-wmi: Detected ATK, enable event queue
[    2.042006] input: Asus WMI hotkeys as /devices/platform/asus-nb-wmi/input/input26

Thanks in advance for any support you can offer.

[lyiriyah]

I switched to the fallback initramfs image on 5.18.12 and rebooted a few times -- that seemed to work. Don't know what the actual fix is.

[FossPrime]

Did the acpi_call-dkms method work?

To try it run:

sudo pacman -Syu linux518-headers
pamac install acpi_call-dkms
echo '\_SB.ATKD.WMNB 0x0 0x53564544 b32000500FF000000' | sudo tee /proc/acpi/call

That sets the brightness to 0xFF

[lyiriyah]

Sorry, didn't see this for a while
I can check for you in a couple hours