| 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 | dri-devel@lists.freedesktop.org |
| Reporter | zajec5@gmail.com |
I use HP EliteBook 745 G5 with Ryzen 5 PRO 2500U. Starting with the: commit 262485a50fd4532a8d71165190adc7a0a19bcc9e (refs/bisect/bad) Author: Anthony Koo <Anthony.Koo@amd.com> 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 <Anthony.Koo@amd.com> Reviewed-by: Tony Cheng <Tony.Cheng@amd.com> Acked-by: Leo Li <sunpeng.li@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> 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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