Bug 354429

Summary:	Displayport: upon resume, only a small section of screen is present on external screen
Product:	[Plasma] KScreen	Reporter:	jamese <james.ellis>
Component:	common	Assignee:	Daniel Vrátil <dvratil>
Status:	RESOLVED FIXED
Severity:	major
Priority:	NOR
Version First Reported In:	5.4.2
Target Milestone:	---
Platform:	Kubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	Photo showing section of screen showing upon resume Photo showing section of screen with Disp Config open and layout shown

Description jamese 2015-10-27 00:20:27 UTC

I have a 2560x1440  Dell U2711 screen connected by  Displayport to laptop running Ubuntu intel driver (15.10 standard Kubuntu packages). Sometimes, but not every time, when the laptop resumes and the external screen is connected, only a small section of the external screen is active.

Luckily, I can open Display Configuration using the launcher of Alt+F2, move Display Configuration into the sliver of screen using Right Click > More Actions > Move and readjust the screen layouts then hit Apply which fixes the issue in all instances.

See attached photos of screen. Only the part of the screen showing the background is active.

I don't know if this is related to Kscreen.


Reproducible: Always

Steps to Reproduce:
1. Resume laptop with external DP connected screen
2. See result in attachments to be uploaded
3.

Actual Results:  
Sliver of screen shows and is active

Expected Results:  
Both the laptop screen and external screen should be active and arranged in the last used display layout for that screen setup

I'm setting this as  Major as it makes KDE unusable. I doubt a new user would find a way out of this without Turning It Off And On Again.

Comment 1 jamese 2015-10-27 00:22:22 UTC

Created attachment 95151 [details]
Photo showing section of screen showing upon resume

The cursor position is the furthest it will travel to the right.

Comment 2 jamese 2015-10-27 00:24:55 UTC

Created attachment 95152 [details]
Photo showing section of screen with Disp Config open and layout shown

After rearranging the screens and hitting apply, both screens come back.

Comment 3 jamese 2016-03-23 22:42:22 UTC

Have a feeling this was fixed in 5.5 as it doesn't happen anymore on Kubuntu 15.10 with Plasma 5.5 from backports.