Bug 426755

Summary:	Kscreen - HDMI external screen issue at max resolution 3440x1440 only half screen visible
Product:	[Plasma] KScreen	Reporter:	slav <infoslaw>
Component:	common	Assignee:	kscreen-bugs-null <kscreen-bugs-null>
Status:	RESOLVED FIXED
Severity:	normal
Priority:	NOR
Version First Reported In:	5.19.5
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	this how looks external screen after log in to KDE (laptop screen have switch off)

Description slav 2020-09-19 23:46:02 UTC

SUMMARY


STEPS TO REPRODUCE
When runnig laptop with connected only external screen by HDMI (Iiyama North America PL3490WQ (DP-2-1 3440x1440) after logon to KDE unfortunately can see only half active screen (rest is black)

OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 5.9.15
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: 5.15.1

ADDITIONAL INFORMATION
I found temporary solution:
1. run kscreen
2. set lower resolution then apply
3. changing for desire resolution 3440x1440 and set up 30Hz (at 60Hz doesn't change) then apply then have full screen working

Comment 1 slav 2020-09-20 11:47:08 UTC

Created attachment 131802 [details]
this how looks external screen after log in to KDE (laptop screen have switch off)

Comment 2 slav 2020-10-02 14:01:03 UTC

Issue has been resolved with new plasma-workspace 5.19.5-3 version.