[Bug 203439] New: 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

            Bug ID: 203439
           Summary: amdgpu: [REG 4.20 -> 5.0] Brightness minimum level is
                    too high
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.0
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: spaz16 at wp.pl
        Regression: No

I have Huawei Matebook D 14 with AMD Ryzen 2500U.

Since kernel 5.0.x the minimum brightness level is too high. It is not possible
to dim the display as much as on previous kernel version. Kernel 4.20 also
allows to disable the backlight on level 0.

Value of "0" in "/sys/class/backlight/amdgpu_bl0/brightness" currently doesn't
disable backlight as in previous version. Value of "1" means the screen is dim,
but not as much as in kernel 4.20. Sometimes the screen is still too bright
even on level 0 in kernel 5.0.

Since commit 206bbafe00dcacccf40e6f09e624329ec124201b I can see the define:
> #define AMDGPU_DM_DEFAULT_MIN_BACKLIGHT 12

Maybe it should be defined to "0" to restore the old behavior? (I haven't
tested yet)

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