Bug 66871

Summary: Radeon multi-screen intermittent display failure
Product: Drivers Reporter: Erik Edwards (erik)
Component: Video(DRI - non Intel)Assignee: drivers_video-dri
Status: NEW ---    
Severity: normal CC: alexdeucher, erik, szg00000
Priority: P1    
Hardware: x86-64   
OS: Linux   
Kernel Version: 3.13.0-rc3 Subsystem:
Regression: No Bisected commit-id:
Attachments: dmesg
Xorg.log
System messages

Description Erik Edwards 2013-12-11 02:42:34 UTC 
In this kernel the 3rd display only comes on for a few partial frames every 20 to 40 seconds. Three displays attached to motherboard.

Under kernel 3.11.10, Radeon driver operates correctly. 


Using:
 ASRock FM2A85X-ITX MB
 AMD A10-6800k (Not overclocked)
 8 GB DDR3
 VGA montitor   - Dell flat screen - 19" 
 HDMI0 montitor - (via DVI connector) - Acer 23" flat.
 HDMI1 montitor - (via HDMI connector) - Acer 22" flat 

VGA is 1   - on an the left.
HDMI1 is 2 - in the center.
HDMI0 is 3 - on the right.
Comment 1 Michel Dänzer 2013-12-11 04:08:26 UTC 
Can you bisect?
Comment 2 Alex Deucher 2013-12-11 13:33:54 UTC 
Please attach your xorg log and dmesg output as well.
Comment 3 Erik Edwards 2013-12-11 17:35:00 UTC 
I'm not sure what you mean.
Comment 4 Erik Edwards 2013-12-11 17:40:37 UTC 
Created attachment 118061 [details]
dmesg
Comment 5 Erik Edwards 2013-12-11 17:40:56 UTC 
Created attachment 118071 [details]
Xorg.log
Comment 6 Erik Edwards 2013-12-11 17:41:21 UTC 
Created attachment 118081 [details]
System messages
Comment 7 Erik Edwards 2014-02-25 16:59:25 UTC 
Fedora released 3.13.3 (kernel.x86_64 0:3.13.3-201.fc20) and this is still happening; though, it doesn't happen with 3.12.10 (kernel-3.12.10-300.fc20.x86_64).
Comment 8 Alex Deucher 2014-02-25 17:11:53 UTC 
Can you use git to bisect what commit caused the regression?  Google for git bisect howto.
Comment 9 Erik Edwards 2014-06-02 16:17:12 UTC 
(In reply to Alex Deucher from comment #8)
> Can you use git to bisect what commit caused the regression?  Google for git
> bisect howto.

3.12.5

Found a workaround:

Allow nromal boot to graphical environment with all monitors powered on. After GUI login is displayed and DVI connected monitor is blank do <ctrl><alt>F2 to switch to text console. Wait until all working displayas are stable then power off and power on non-fucntional display via its power button. Wait until all displays are stable then return to GUI.