Bug 1400650

Summary:	External monitor flickering after F24 to F25 upgrade
Product:	[Fedora] Fedora	Reporter:	Joe Doss <joe>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	high	Docs Contact:
Priority:	unspecified
Version:	25	CC:	cz172638, gansalmon, ichavero, itamar, jonathan, kernel-maint, madhu.chinakonda, mchehab
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Last Closed:	2016-12-01 18:51:54 UTC	Type:	Bug
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
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Description Joe Doss 2016-12-01 17:27:38 UTC

Description of problem:
Upgrading from F24 to F25 causes an external monitor to randomly flicker off and then back on. 

Version-Release number of selected component (if applicable):
4.8.10-300.fc25.x86_64
fpaste --sysinfo URL =  https://paste.fedoraproject.org/494783/14806127

How reproducible:
All the time.

Steps to Reproduce:
1. Connect Thinkpad to Thinkpad ultradock with external monitor on Displayport
2. Launch programs and start working.

Actual results:
External monitor starts to flicker off and on randomly.

Expected results:
No flickering

Additional info:

This wasn't happening at all with Fedora 24.

Comment 1 Joe Doss 2016-12-01 17:55:19 UTC

This might not be a kernel problem and I think I narrowed down when the flicker happens.

I just updated my terminal program ( terminator-1.90-1.fc25.noarch to terminator-0.98-4.fc25.noarch) and clipit (clipit-1.4.2-11.fc24.x86_64) could no longer draw it's window when focused on the terminal window. Testing with Gnome Terminal the same behavior happens. I have to mouse focus off the terminal window to get clipit to draw the window.

I also noticed that I can trigger the external monitor flicker when working on on Gnome Terminal or Terminator and I trigger a right click window dialog or I try to issue my hot key to clipit to show my clipboard history.

Comment 2 Joe Doss 2016-12-01 18:51:54 UTC

After further digging around it seems this is a dupe of https://bugzilla.redhat.com/show_bug.cgi?id=1353008

*** This bug has been marked as a duplicate of bug 1353008 ***