Bug 369384

Summary:	Dual Monitor: only unified output
Product:	[Plasma] KScreen	Reporter:	RalphB <pub>
Component:	kcm	Assignee:	Sebastian Kügler <sebas>
Status:	RESOLVED FIXED
Severity:	major	CC:	pub
Priority:	NOR
Version First Reported In:	5.5.5
Target Milestone:	---
Platform:	Kubuntu
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:
Attachments:	systemsettings showing only one monitor in preview

Description RalphB 2016-09-26 16:55:56 UTC

I have two monitors connected to my Intel Skylake onboard graphics, using DVI and HDMI connectors.

In systemsettings, only one monitor is shown in the top graphics window as "HDMI3".  In the primary display, I can select HDMI2 or HDMI3.

Both monitors show the same screen, despite "unify outputs" not being chosen.

Reproducible: Always

Steps to Reproduce:
1. connect two monitors to HDMI and DVI of Intel onboard graphics
2. open systemsettings
3. unselect "unify outputs"

Actual Results:  
both screen shows same image

Expected Results:  
desktop spread over both monitors, showing a different image each

Comment 1 RalphB 2016-09-26 17:55:06 UTC

xrandr output:
Screen 0: minimum 8 x 8, current 1600 x 1200, maximum 32767 x 32767
DP1 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 connected primary 1600x1200+0+0 (normal left inverted right x axis y axis) 408mm x 306mm
   1600x1200     60.00*+
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1152x864      75.00  
   1024x768      75.08    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    66.67    60.00  
   720x400       70.08  
HDMI3 connected 1600x1200+0+0 (normal left inverted right x axis y axis) 408mm x 306mm
   1600x1200     60.00*+
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1152x864      75.00  
   1024x768      75.08    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    66.67    60.00  
   720x400       70.08  
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

Comment 2 Sebastian Kügler 2016-09-27 01:02:24 UTC

Thanks for the bug-report!

Just to be sure: when applying the config to span the desktop across both screens, you should drag the outputs in the preview accordingly. The unify button behaves a bit weird like that, I'm not perfectly happy with how the interaction works there, and we're currently revisiting this.

That said, I am aware of positioning bugs that can lead to the problem you're facing. The good news is that they are fixed already, although only in the upcoming Plasma 5.8 release. Could you please test this release and report back? (I'll close this bug-report in the meantime, if the bug persists with 5.8, we can re-open it and look into it again.)

Comment 3 RalphB 2016-09-27 13:39:18 UTC

Thanks for the feedback.  I'm currently stuck on 5.5 with Kubuntu, but I'll be able to test next release.

But just to clarify what I'm talking about, I attached a screenshot of systemsettings, which shows only one monitor in the preview, even though there are two.

Comment 4 RalphB 2016-09-27 13:40:03 UTC

Created attachment 101316 [details]
systemsettings showing only one monitor in preview

Comment 5 Sebastian Kügler 2016-09-27 22:12:39 UTC

So, what happens if you drag the HDMI2 SyncMaster output aside in the top section?

Comment 6 RalphB 2016-09-28 15:37:16 UTC

OMG! Now I see, and it WORKS ...  But, you know, this isn't really very intuitive. :-)

Has this been changed in newer releases?  If not, I'd like to convert this bug report into a feature reuqest. :-)

Comment 7 Sebastian Kügler 2016-09-28 21:25:02 UTC

I'm not overly happy with that portion of the ui either. We're currently in the process of polishing the design of that settings module, and I'll take your feedback into account.

Thanks!