[Bug 198885] amdgpu.dc=1 on CIK (R4 Mullins APU) brightness impossible to change. by Fn or "echo".

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=198885

--- Comment #3 from Przemek (soprwa at gmail.com) ---
And here values from requested files without "amdgpu.dc=1"

"/sys/class/backlight/amdgpu_bl0 # ls -l
razem 0
-r--r--r-- 1 root root 4096 02-22 17:50 actual_brightness
-rw-r--r-- 1 root root 4096 02-22 17:50 bl_power
-rw-r--r-- 1 root root 4096 02-22 17:39 brightness
lrwxrwxrwx 1 root root    0 02-22 17:50 device -> ../../card0-eDP-1
-r--r--r-- 1 root root 4096 02-22 17:39 max_brightness
drwxr-xr-x 2 root root    0 02-22 17:50 power
lrwxrwxrwx 1 root root    0 02-22 17:39 subsystem ->
../../../../../../../class/backlight
-r--r--r-- 1 root root 4096 02-22 17:39 type
-rw-r--r-- 1 root root 4096 02-22 17:38 uevent"

"/sys/class/backlight/amdgpu_bl0 # cat brightness
23"

"/sys/class/backlight/amdgpu_bl0 # cat actual_brightness
23"

"/sys/class/backlight/amdgpu_bl0 # cat max_brightness
255"


With smaller values from previous post (with "amdgpu.dc=1" on kernel
commandline) screen is much brighter, as backlight was set almost 100%.

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