[Bug 203439] amdgpu: [REG 4.20 -> 5.0] Brightness minimum level is too high

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=203439

--- Comment #3 from Błażej Szczygieł (spaz16 at wp.pl) ---
Thank you for the reply!

In bright room you can quickly disable the backlight (set it to 0) using the
Fn+F1 keys. You can save power and the display content doesn't disturb you, but
you can still notice that computer is working (the screen content can be still
visible). It is more convenient than DPMS, especially if you have duplicated
screen with HDMI and you don't want to reconfigure anything, just you want to
quickly disable the backlight.

Moreover, the current minimum backlight level is too bright for very dark room.
Sometimes I need to set to value of "2" or even "1" in kernel 4.20. Since
kernel 5.0 it is not possible and I'm not feeling convenient with too bright
display.

On Huawei Matebook D 14 the display doesn't flicker at all even on brightness
level 1 on kernel 4.20 (no PWM). Maybe it is a good idea to blacklist or
whitelist some devices? Or maybe it is a good idea to add an additional kernel
parameter to restore the old behavior and unlock all possible backlight levels
for more advanced users?

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