[Bug 203905] amdgpu:actual_brightness has unreal/wrong value

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203905

Paulo Nascimento (paulo.ulusu at googlemail.com) changed:

           What    |Removed                     |Added
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                 CC|                            |paulo.ulusu at googlemail.com

--- Comment #21 from Paulo Nascimento (paulo.ulusu at googlemail.com) ---
I confirm that the bug is not fixed in kenel 5.11-rc3

max brightness:
[pn at pn-legion backlight]$ cat /sys/class/backlight/amdgpu_bl1/actual_brightness
311
[pn at pn-legion backlight]$ cat /sys/class/backlight/amdgpu_bl1/brightness
255
[pn at pn-legion backlight]$ cat /sys/class/backlight/amdgpu_bl1/max_brightness
255

min brightness:
[pn at pn-legion backlight]$ cat /sys/class/backlight/amdgpu_bl1/actual_brightness
311
[pn at pn-legion backlight]$ cat /sys/class/backlight/amdgpu_bl1/brightness
0
[pn at 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 at 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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