Bug 109068

Summary: Raven Ridge: backlight is off after suspend
Product: DRI Reporter: Samantha McVey <samantham>
Component: DRM/AMDgpuAssignee: Default DRI bug account <dri-devel>
Status: RESOLVED MOVED QA Contact:
Severity: normal    
Priority: medium CC: harry.wentland, nicholas.kazlauskas
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
amd-staging-drm-next dmesg
none
4.20-rc5 dmesg none

Description Samantha McVey 2018-12-16 00:17:25 UTC 
This is an issue on amd-staging-drm-next but not on 4.19.7. I have not tested other kernels. The issue is that if you put the system in suspend and wake it up again, the backlight is off. On 4.19 when you resume from suspend the backlight resumes the same level it was when you put it into suspend.
Comment 1 Michel Dänzer 2018-12-17 11:52:55 UTC 
Please attach the output of dmesg in both cases.
Comment 2 Samantha McVey 2018-12-17 17:37:27 UTC 
Created attachment 142837 [details]
amd-staging-drm-next dmesg
Comment 3 Samantha McVey 2018-12-17 17:39:18 UTC 
Created attachment 142838 [details]
4.20-rc5 dmesg

In addition, this is what happens to the levels of "brightness" and "actual_brightness" before and after sleep on amd-staging-drm-next:

Before sleep:
actual_brightness: 12141 brightness: 102
After sleep:
actual_brightness: 0 brightness: 102

On 4.20-rc5 or 4.19 actual_brightness is not at 0 after resume from suspend.
Comment 4 Martin Peres 2019-11-19 09:08:28 UTC 
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