Bug 103641

Summary:	Resume to black screen, Radeon HD 5750 on DP
Product:	Drivers	Reporter:	Jimmy Kloss (jimmy.kloss)
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	NEW ---
Severity:	normal	CC:	alexdeucher, szg00000
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	4.0+	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	dmesg output Xorg log

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.