A really strange phenomenon is plaguing me [innocently working on my laptop] for the last two days. The brightness keeps resetting periodically (probably every 1-2 minutes) to the highest possible value. My brightness keys don't work, either.
My nvidia-smi is
+-----------------------------------------------------------------------------+
| NVIDIA-SMI 465.27 Driver Version: 465.27 CUDA Version: 11.3 |
|-------------------------------+----------------------+----------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
| | | MIG M. |
|===============================+======================+======================|
| 0 NVIDIA GeForce ... Off | 00000000:01:00.0 On | N/A |
| N/A 49C P8 3W / N/A | 455MiB / 3911MiB | 8% Default |
| | | N/A |
+-------------------------------+----------------------+----------------------+
+-----------------------------------------------------------------------------+
| Processes: |
| GPU GI CI PID Type Process name GPU Memory |
| ID ID Usage |
|=============================================================================|
| 0 N/A N/A 121351 G /usr/lib/xorg/Xorg 59MiB |
| 0 N/A N/A 121608 G /usr/lib/xorg/Xorg 235MiB |
| 0 N/A N/A 121736 G /usr/bin/gnome-shell 34MiB |
| 0 N/A N/A 122281 G ...AAAAAAAA== --shared-files 18MiB |
| 0 N/A N/A 122706 G ...AAAAAAAAA= --shared-files 95MiB |
| 0 N/A N/A 130318 G /usr/bin/nvidia-settings 0MiB |
+-----------------------------------------------------------------------------+
I have tried multiple fixes. I've set the "EnableBrightnessControl" to true, tried editing a lot of config files, run xrandr --output DP-4 --brightness 0.3 (even run it periodically to set it back to 0.3 using the watch command, that makes it flicker when the reset happens and really destroys my eyes). I've also tried using nvidia x-server to set the brightness and contrast myself. But it always resets within a matter of minutes.
Any help will be massively appreciated. I can add any logs or outputs based on comments asking for them.
My GPU: GTX 1650
Output of cat /etc/X11/default-display-manager is /usr/sbin/gdm3
EDIT: One interesting point is that it stopped last night after I disabled night light!
