Bug 1443581

Summary:	Screen flickering on 4k resolution in Wayland
Product:	[Fedora] Fedora	Reporter:	Johannes Raggam <thetetet>
Component:	wayland	Assignee:	Adam Jackson <ajax>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	26	CC:	ajax, xgl-maint
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-06-28 08:49:32 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 Johannes Raggam 2017-04-19 14:01:22 UTC

I think this Bug is related to https://bugzilla.redhat.com/show_bug.cgi?id=1353008 but it have got the problem under Fedora 26 alpha, so I submit it a a new one.

Under Fedora 26 alpha in 4k resolution the screen is flickering/shaking around. When I move the mouse, the problem disappears. When starting glxgears, there is at least less screen shaking. When I set the resolution to 1920x1080 the problem is gone away.

this is my uname -a output:
4.11.0-0.rc6.git0.1.fc26.x86_64

My hardware:
Lenovo Yoga 910 with a 4k screen.

I have set this, but this doesn't resolbe the issue:

/etc/modprobe.d/i915.conf 
options i915 enable_psr=0 enable_fbc=0 enable_rc6=0

Comment 1 Johannes Raggam 2017-04-24 09:11:47 UTC

Screen does not flicker and shake with an external FullHD Monitor attached, where the FullHD is in normal DPI mode (window scaling 1 automatically applied) and the built-in 4k monitor is in 4k resolution and HiDPI mode (window scaling 2 automatically applied).

Have to test again with external monitor not attached, later this day.

Comment 2 Johannes Raggam 2017-04-26 07:52:27 UTC

More testing:

- screen does not flicker with any resolution other than the native 3840x2160.

- screen does not flicker with older 4.10.10 kernel.

Comment 3 Johannes Raggam 2017-06-28 08:49:32 UTC


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