I have a NVIDIA GPU and a CPU with integrated graphics.
I booted up my system this morning and I was unable to change the brightness. Whenever I press the brightness +/- keys the brightness change indicator would pop up but there wouldnt be any change in brightness. In /etc/default/grub I’ve tried variants of adding acpi_backlight=$VALUE (vendor, native, none) into GRUB_CMDLINE_LINUX_DEFAULT and GRUB_CMDLINE_LINUX="" and none of them worked.
After looking through some other forums I tried echo 10 | sudo tee /sys/class/backlight/amdgpu_bl1/brightness and that worked. I’m still not sure why nothing else is working though.
What is the output of
Are you using hybrid driver or NVIDIA only driver?
The output was
I am using the video-hybrid-amd-nvidia-prime driver
Ok, since you’re using the hybrid driver one, the amdgpu_bl1 is the one used mainly to control the display.
Just to make sure first, check if there’s no error found in
Then try enabling native backlight:
sudo nano /etc/default/grub
- Add “video.use_native_backlight=1” to GRUB_CMDLINE_LINUX_DEFAULT, for example GRUB_CMDLINE_LINUX_DEFAULT=“quiet splash … OTHER_CURRENT_ENTRIES_HERE … video.use_native_backlight=1”
If this doesn’t work, then you probably need to update some of the system xorg conf file.
You will likely find it in
You may need to update one of the X server configuration file here, the one with:
I use NVIDIA only for display, so I can’t tell what kind of brightness options to add to the AMDgpu section for your case.
Adding video.use_native_backlight=1 set the brightness to 100% (still unable to change it manually) and actually changed the name of the folder amdgpu_bl1 to amdgpu_bl0. From what I can tell there is no error found in sudo dmesg
I’ll try and look up what to add to the xorg conf files
Update: I am still unsure how to solve this and I really don’t want to mess something up
I find this issue comes and goes over the years with changing kernels/kernel updates.
I eventually just rolled back to a previous version of my system via Timeshift and that seemed to work.
Through some trial and error I discovered that this brightness issue only happens after I update my system so I will not be doing that anytime soon. I don’t know which package could be breaking the brightness though I suspect the following package updates to be a possibility for causing this issue:
manjaro-release 23.2.3-1, nvidia-utils, nvidia-prime