Keyboard backlight issues

[sriniferal]

Distribution (run cat /etc/os-release):
NAME="Pop!_OS"
VERSION="22.04 LTS"
ID=pop
ID_LIKE="ubuntu debian"
PRETTY_NAME="Pop!_OS 22.04 LTS"
VERSION_ID="22.04"
HOME_URL="https://pop.system76.com"
SUPPORT_URL="https://support.system76.com"
BUG_REPORT_URL="https://github.com/pop-os/pop/issues"
PRIVACY_POLICY_URL="https://system76.com/privacy"
VERSION_CODENAME=jammy
UBUNTU_CODENAME=jammy
LOGO=distributor-logo-pop-os

Related Application and/or Package Version (run apt policy $PACKAGE NAME):
system76-power profile
Power Profile: Balanced
Backlight amdgpu_bl1: 85/255 = 33%

Issue/Bug Description:
The backlight on my pangolin (pang11) has stopped working and it is stuck in a blue light. I cannot turn it off, increase/decrease the brightness, nor change the colour. The Fn keys work normally, and it is not an keyboard issue. The backlight disappears when the laptop goes to sleep (Fn+F12 on my laptop), it cannot be turned on after exiting the sleep mode.

This seems to be a software issue as the same problem is not faced if I boot using a live disk. I’m not sure if this is due to any recent software updates.

Steps to reproduce (if you know):

Expected behavior:

Other Notes:

[leviport]

I wonder if this is related to pop-os/linux#321

Could you try this command and a reboot to see if it helps?

sudo dpkg-reconfigure system76-acpi-dkms

[sriniferal]

Tried the above command, the issue is unresolved.

[leviport]

Tried the reboot as well, I presume?

Oh well, it was worth a try. Thanks for giving it a shot.

[jdrck]

The same thing has occurred on my Gazelle 15 (Pop OS 22.04 LTS). Stuck in blue light after a recent reboot. Odds are it's due to a recent software update which completed during the reboot. Rebooting, reinstalling system76-acpi-dkms, sudo dpkg-reconfigure system76-acpi-dkms didn't help

[leviport]

This may be the same issue as pop-os/linux#319

[daaang]

I'm having the same issue on an addw1 laptop. I rebooted earlier today, and the keyboard did its usual blue -> green -> red -> blue. Normally, at that point, it turns off (I'm not a keyboard backlight enjoyer) and I decrypt the disk, but now it's just staying blue no matter what (which has to be the worst possible option?? Like, at least red or green LEDs wouldn't be so bad)

I tried dpkg-reconfigure system76-acpi-dkms, then rebooting, and same issue.

Thanks to the OP here, I did try putting to sleep and waking up, which essentially solves the issue for me, in that the backlight is off, which is all I ever want. Thanks, OP!

More generally though, the keyboard backlight Fn keys are not doing anything, so I'm another data point here.

More data that may or may not be relevant (I never thought to run this back when it was working, so I've no diff to offer):

$ ls /sys/class/backlight
intel_backlight       # this is the monitor

[groknroll]

Running sudo apt install --reinstall system76-dkms system76-acpi-dkms seems to have fixed the issue on my pang11.

[WilburTheMango]

Gazelle 15, reinstalling system76-dkms system76-acpi-dkms and rebooting solved the issue.

[sriniferal]

Thanks. I reinstalled system76-dkms system76-acpi-dkms and a reboot fixed the issue.

[daaang]

Yes, thank you!

apt-get install --reinstall system76-dkms system76-acpi-dkms

fixed it for me (addw1) as well.