Bug 354247

Summary:	Screen artifacts
Product:	[Plasma] kwin	Reporter:	Nikola Schnelle <n.schnelle>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal
Priority:	NOR
Version First Reported In:	5.4.2
Target Milestone:	---
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Nikola Schnelle 2015-10-23 11:12:07 UTC

I get screen artifacts in Plasma 5 at random. It happens on laptops with haswell and broadwell gpus. When compositing type is changed, artifacts disappear. 

This is easily reproducible in Kubuntu 14.10.

Reproducible: Always

Steps to Reproduce:
1. In Kubuntu 14.10 (or live session) go to System settings>Fonts
2. Enable anti-aliasing (additionally, you can set RGB and slight hinting)
3. Artifacts start "dancing" on the screen. They are easily seen with Present windows effect.

Comment 1 Martin Flöser 2015-10-23 11:15:42 UTC

Can you please clarify: are you really using Kubuntu 14.10?

Comment 2 Thomas Lübking 2015-10-23 14:31:21 UTC

In addition please provide:

1. Screenshots (video?)
2. qdbus org.kde.KWin /KWin supportInformation
3. /var/log/Xorg.0.log

Comment 3 Martin Flöser 2016-10-28 19:02:52 UTC

Waiting for the replies to comment #1 and comment #2.

Comment 4 Nikola Schnelle 2016-10-28 19:09:18 UTC

Martin, I cannot reproduce the bug anymore on Neon user edition.

Comment 5 Martin Flöser 2016-10-28 19:44:17 UTC

Thanks for the feedback and I'm glad that this problem is gone. I guess it's the switch to modesettings driver in X ;-). Setting to worksforme.

Comment 6 Nikola Schnelle 2016-10-28 19:56:07 UTC

(In reply to Martin Gräßlin from comment #5)
> I guess it's the switch to modesettings driver in X ;-)

Yea probably. Flashing/flickering system tray is also gone with switch to modesettings driver.