Control: tags -1 = moreinfo On Tue, 04 Feb 2020 09:26:58 +0100 Valerio Passini <valerio.pass...@unicam.it> wrote: > Package: systemd > Version: 244.1-2 > Severity: normal > Tags: patch > > Dear Maintainer, > > Brightness controls on keyboard (and any other mean except xrandr) have not > been working reliably since the day I installed Debian on my laptop: sometime > it was possible to tune brightness after a fresh boot, sometime only after a > S2R and resume.
What exactly was not working? What did you do, what did you expect, what did (not) happen. > Trying to find a solution, I have discovered that masking the backlight > service fixes the problem: > > sudo systemctl mask systemd-backlight@backlight:nvidia_0.service > > I have double checked that enabling the service again restores the issue. > The relevant information on my system are: > Laptop model: HP Omen 15-dh0002nl, GPU Nvidia > Software: Debian/Unstable Xorg Nvidia proprietary drivers (don't mind about my > custom kernel, the issue is the same with Debian stock kernel) > systemd-backlight@.service simply stores the current backlight value on shutdown and restores it on boot. It reads from /sys/class/backlight/*/brightness and writes accordingly. If that somehow confuses the hardware, this smells like a driver/kernel issue. Michael
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