Bug 103641 - Resume to black screen, Radeon HD 5750 on DP
Summary: Resume to black screen, Radeon HD 5750 on DP
Status: NEW
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - non Intel) (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: drivers_video-dri
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-08-28 14:02 UTC by Jimmy Kloss
Modified: 2016-03-23 18:34 UTC (History)
2 users (show)

See Also:
Kernel Version: 4.0+
Subsystem:
Regression: No
Bisected commit-id:

Attachments
dmesg output (69.52 KB, text/x-log)
2015-08-28 16:37 UTC, Jimmy Kloss 		Details
Xorg log (85.22 KB, text/x-log)
2015-08-28 16:40 UTC, Jimmy Kloss 		Details
Add an attachment (proposed patch, testcase, etc.)

Description Jimmy Kloss 2015-08-28 14:02:35 UTC 
When resuming from suspend-to-ram the DisplayPort does not come back The monitor says 'No Signal', only a reboot brings the DP video output back to live. The HDMI output is unaffected.

I assumed this happened while enabling DP Audio on radeon.

Now I bisected from v3.19 to v4.0

e55bca26188e45f209597abf986c87cc5a49894a is the first bad commit
commit e55bca26188e45f209597abf986c87cc5a49894a
Author: Slava Grigorev <slava.grigorev@amd.com>
Date:   Fri Dec 12 17:01:42 2014 -0500

    radeon/audio: enable DP audio
    
    Reviewed-by: Christian König <christian.koenig@amd.com>
    Signed-off-by: Slava Grigorev <slava.grigorev@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

:040000 040000 25da4481f28d249ec827fe72c0b14c0a50265887 2eb7eb3728a5b811b0f954cbce486841c90ef938 M      drivers
Comment 1 Alex Deucher 2015-08-28 14:45:34 UTC 
Please attach your xorg log and dmesg output.  Also, does your monitor support audio or not?
Comment 2 Jimmy Kloss 2015-08-28 16:37:07 UTC 
Created attachment 186121 [details]
dmesg output
Comment 3 Jimmy Kloss 2015-08-28 16:40:20 UTC 
Created attachment 186131 [details]
Xorg log

The monitor does support audio. I use it regularly and it works fine.
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