Bug 378598

Summary:	Scaling display affects all monitors
Product:	[Plasma] KScreen	Reporter:	dani_kase
Component:	common	Assignee:	Sebastian Kügler <sebas>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	andrew.crouthamel, elkasir, leonard, lueck
Priority:	NOR
Version First Reported In:	5.9.4
Target Milestone:	---
Platform:	Neon
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	Monitor Scaling Issues

Description dani_kase 2017-04-09 22:01:51 UTC

I have a 4k 15.6' laptop and an external monitor FHD 22 inches. The problem is that the laptop screen I need to scale to improve readability due to the extremely high density of each pixel. Unfortunately the external monitor is scaled with the same ratio once I do so. Each monitor instead should have a separate scaling factor to be entered through the Displays application.

Comment 1 Sebastian Kügler 2017-04-19 10:00:16 UTC

Thanks for the bugreport!

Have you tried the mechanism described here: http://doc.qt.io/qt-5/highdpi.html#high-dpi-support-in-qt ?

(It's not reflected in the KScreen UI, in that sense, the bug is valid. You may be able to work around it, though.)

Comment 2 Christoph Feck 2017-06-06 15:47:09 UTC

*** Bug 380096 has been marked as a duplicate of this bug. ***

Comment 3 Andrew Crouthamel 2018-02-08 19:07:16 UTC

Created attachment 110445 [details]
Monitor Scaling Issues

All screens use scaling of 2 with no option to change. Top screen is FHD, bottom is QHD.

Comment 4 Andrew Crouthamel 2018-02-08 19:07:32 UTC

This is a problem in 5.12.0 as well. I have a Dell XPS 13 (9360) Developer Edition with the QHD (4k) display. DPI is 144, I set scaling to 2. When a FHD (1080p) monitor is connected, the external monitor is also scaled at 2.

There is no option in the Displays Settings Module to change scaling per-display. This would be a major quality of life improvement for those who use docks and external monitors.

I have attached a screenshot of the issue. The top monitor is the FHD monitor scaled at 2.

KDE Plasma Version: 5.12.0
KDE Frameworks Version: 5.42.0
Qt Version: 5.9.3
Kernel Version 4.13.0-32-generic
OS Type: 64-bit

Comment 5 Sebastian Kügler 2018-02-21 09:40:14 UTC

Thanks for the report!

This isn't supported on X11, and we're not planning to. The Wayland session already has this feature, I'd suggest to consider moving to Wayland.

Comment 6 Andrew Crouthamel 2018-02-21 15:10:10 UTC

(In reply to Sebastian Kügler from comment #5)
> Thanks for the report!
> 
> This isn't supported on X11, and we're not planning to. The Wayland session
> already has this feature, I'd suggest to consider moving to Wayland.

Good to know, thanks. :)