https://bugs.freedesktop.org/show_bug.cgi?id=109375
Bug ID: 109375
Summary: Regression: dark notebook display (no backlight) after
resume
Product: DRI
Version: XOrg git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: DRM/AMDgpu
Assignee: [email protected]
Reporter: [email protected]
I use HP EliteBook 745 G5 with Ryzen 5 PRO 2500U.
Starting with the:
commit 262485a50fd4532a8d71165190adc7a0a19bcc9e (refs/bisect/bad)
Author: Anthony Koo <[email protected]>
Date: Fri Oct 12 21:34:32 2018 -0400
drm/amd/display: Expand dc to use 16.16 bit backlight
[Why] We want to increase precision for backlight setting.
But DC interface takes 8 bit backlight level value only.
[How] DMCU already takes 16 bit backlight level.
Expand the DC interface to take 16.16 bit value.
Max 32 bit backlight value (0xFFFF) will represent
max backlight (100%)
Signed-off-by: Anthony Koo <[email protected]>
Reviewed-by: Tony Cheng <[email protected]>
Acked-by: Leo Li <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>
After resume from RAM my notebook display is all black.
Before suspend:
> cat /sys/class/backlight/amdgpu_bl0/{actual_brightness,brightness}
65535
255
After resume:
> cat /sys/class/backlight/amdgpu_bl0/{actual_brightness,brightness}
0
255
This can be workarounded by:
echo 255 > /sys/class/backlight/amdgpu_bl0/brightness
assuming one can execute that without a working display.
This problem still exists in the 5.0.0-rc2.
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