https://bugzilla.kernel.org/show_bug.cgi?id=203905
--- Comment #22 from Antony J.R (antonyjr000@gmail.com) --- A workaround for this is done by the OpenSUSE folks, Please see https://bugzilla.opensuse.org/show_bug.cgi?id=1180749
The only distro which fixes this is OpenSUSE. This is because there is a bug in the mainline kernel and kernel devs are not responding to us for some reason(maybe file a new issue???).
The problem is that the kernel uses aux for backlight control but our systems don't support backlight control via aux. So disabling aux completely from amdgpu kernel module can give us backlight control for the iGPU. I've tested it and it works just find.
Regards, Antony J.R
On Mon, Feb 8, 2021 at 3:47 AM bugzilla-daemon@bugzilla.kernel.org wrote:
https://bugzilla.kernel.org/show_bug.cgi?id=203905
Paulo Nascimento (paulo.ulusu@googlemail.com) changed:
What |Removed |Added
CC| |paulo.ulusu@googlemail.com
--- Comment #21 from Paulo Nascimento (paulo.ulusu@googlemail.com) --- I confirm that the bug is not fixed in kenel 5.11-rc3
max brightness: [pn@pn-legion backlight]$ cat /sys/class/backlight/amdgpu_bl1/actual_brightness 311 [pn@pn-legion backlight]$ cat /sys/class/backlight/amdgpu_bl1/brightness 255 [pn@pn-legion backlight]$ cat /sys/class/backlight/amdgpu_bl1/max_brightness 255
min brightness: [pn@pn-legion backlight]$ cat /sys/class/backlight/amdgpu_bl1/actual_brightness 311 [pn@pn-legion backlight]$ cat /sys/class/backlight/amdgpu_bl1/brightness 0 [pn@pn-legion backlight]$ cat /sys/class/backlight/amdgpu_bl1/max_brightness 255
My laptop has an amd ryzen 5 4600h with renoir igpu and nvidia dgpu. Tests are done with renoir igpu:
[pn@pn-legion backlight]$ inxi -G Graphics: Device-1: NVIDIA TU116M [GeForce GTX 1660 Ti Mobile] driver: nouveau v: kernel Device-2: Advanced Micro Devices [AMD/ATI] Renoir driver: amdgpu v: kernel Device-3: Chicony Integrated Camera type: USB driver: uvcvideo Display: x11 server: X.Org 1.20.10 driver: loaded: amdgpu,ati,modesetting,nouveau resolution: 1920x1080~120Hz OpenGL: renderer: AMD RENOIR (DRM 3.40.0 5.11.0-1-MANJARO LLVM 11.0.1) v: 4.6 Mesa 20.3.3
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