Bug 1263788

Summary:	Test case failure: Outputs - DP on ATI Pitcairn PRO [Radeon HD 7850] [1002:6819]
Product:	Red Hat Enterprise Linux 7	Reporter:	Vasiliy Sharapov <vsharapo>
Component:	xorg-x11-drv-ati	Assignee:	Jérôme Glisse <jglisse>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Desktop QE <desktop-qa-list>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	7.2	CC:	tpelka
Target Milestone:	rc
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-09-23 14:34:19 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Vasiliy Sharapov 2015-09-16 17:11:51 UTC

Filed from caserun (https://tcms.engineering.redhat.com/run/260129/#caserun_10820272)

Version-Release number of selected component (if applicable):
RHEL-7.2-20150820.0
xorg-x11-server-Xorg-1.17.2-7.el7.x86_64
xorg-x11-drv-ati-7.5.0-3.el7.x86_64
kernel-3.10.0-306.0.1.el7.x86_64
linux-firmware-20150727-41.git75cc3ef.el7.noarch
mesa-dri-drivers-10.6.0-1.20150616.el7.x86_64

Steps to Reproduce: 
obtain a box with DP output  and as much screens as can be attached


 1. connect screens through DP port
 2. perform suspend/resume cycle two times



Actual results: 
If machine booted without DP, hotplugging will cause it to reboot immediately.
Otherwise (if booted with DP plugged in) DP works, but repeated hotpluging with 3+ monitors will cause it to stop working (xrandr will show DP monitor as working, but the monitor will go to sleep from lack of signal).


Expected results:
Screens should be correctly set, their native resolution should be set and
suspend/resume cycles should work as well


Additional info:
DP also suffers from mild temporary corruption on wake from standby - same as every digital output on this video card, this is a separate bug: https://bugzilla.redhat.com/show_bug.cgi?id=1263784

Comment 1 Jérôme Glisse 2015-09-23 14:34:19 UTC

So talked with Vasiliy and we believe this was some electrical grounding issue on his test setup. We could not reproduce on mine.