https://bugs.kde.org/show_bug.cgi?id=371875
Bug ID: 371875
Summary: Plasma 5 Desktop shows Black bar on Second screen in
ultra-wide UW-UXGA (2560x1080) resolution
Product: plasmashell
Version: 5.8.0
Platform: Kubuntu Packages
OS: Linux
Status: UNCONFIRMED
Severity: minor
Priority: NOR
Component: Multi-screen support
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Target Milestone: 1.0
Created attachment 101905
--> https://bugs.kde.org/attachment.cgi?id=101905&action=edit
Screenshot 1 - Desktop with black bar.
Since I've switched from Kubuntu 14.04-32 to 16.04-64 I have a problem with the
desktop on the second screen. The desktop there shows a wide band of black
pixels or pixelated artifacts (see 1st screenshot). Therefore this area of
desktop and every widgets placed here is unusable (see 2nd screenshot).
After some testing I can say that the problem is
1) not caused by a hardware defect in my Thinkpad T60 with ATI RV530.
2) not caused by the video driver infrastructure.
3) affecting the desktop (simple color, background pattern and background
picture) and all desktop widgets.
4) affecting the login screen.
5) not affecting any applications. They can be placed anywhere on the screen
without artifacts.
6) not present when the resolution of the second screen is lower than 2560x1080
(UW-UXGA).
7) was not present in Kubuntu 14.04.
8) is present in every version of Plasma 5 - in Kubuntu 16.04 with Plasma 5.5
and now 5.6.5 up to the latest Neon (neon-useredition-20161012-1222-amd64) with
Plasma 5.8.1.
Somehow it looks like a corruption of the video buffer memory - is there a
process writing to this piece of memory?
GHPS
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