Bug 1263788 - Test case failure: Outputs - DP on ATI Pitcairn PRO [Radeon HD 7850] [1002:6819]
Test case failure: Outputs - DP on ATI Pitcairn PRO [Radeon HD 7850] [1002:6819]
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: xorg-x11-drv-ati (Show other bugs)
x86_64 Linux
unspecified Severity unspecified
: rc
: ---
Assigned To: Jérôme Glisse
Desktop QE
Depends On:
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Reported: 2015-09-16 13:11 EDT by Vasiliy Sharapov
Modified: 2015-09-23 10:34 EDT (History)
1 user (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2015-09-23 10:34:19 EDT
Type: Bug
Regression: ---
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Documentation: ---
Verified Versions:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Vasiliy Sharapov 2015-09-16 13:11:51 EDT
Filed from caserun (https://tcms.engineering.redhat.com/run/260129/#caserun_10820272)

Version-Release number of selected component (if applicable):

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 10:34:19 EDT
So talked with Vasiliy and we believe this was some electrical grounding issue on his test setup. We could not reproduce on mine.

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