Bug 368471

Summary:	Setting scaling does not change anything
Product:	[Plasma] KScreen	Reporter:	Joe Dai <dm.joedai>
Component:	common	Assignee:	Sebastian Kügler <sebas>
Status:	RESOLVED WORKSFORME
Severity:	grave	CC:	cfeck, jsardid
Priority:	NOR	Keywords:	usability
Version First Reported In:	5.5.5
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Joe Dai 2016-09-09 01:08:59 UTC

When attempting to scale KDE using the slider in system settings, it does absolutely nothing. None of the applications that I use scaled at all.

I rebooted several times, checked the scaling in ~/.config/kdeglobals and still no scaling. Everything on my HiDPI display is unreadable.

Reproducible: Always

Steps to Reproduce:
1. System Settings  >  Display and Monitor  >  Scale Display
2. Slide slider to some value
3. Reboot

Actual Results:  
Nothing happened. Everything is still as unreadable as before.

Expected Results:  
Text / font, icons, menus, etc. would've scaled. Everything would be readable.

Laptop model:  Lenovo YOGA 3 Pro
Resolution:   3200 x 1800

Versions:
Display configuration: 5.5.5
KDE Frameworks: 5.18.0
Qt: 5.5.1

Comment 1 Sebastian Kügler 2016-09-09 12:04:19 UTC

Thanks for the report!

Could you try our latest version, preferably even the unstable tree? You can download the dev/unstable flavor of KDE Neon (neon.kde.org) and test with that. I haven't seen this problem in a while, so before I start debugging, I need to know if it's even present in the latest release.

Comment 2 avlas 2016-09-09 13:00:35 UTC

I suffered the same before in KDE neon user edition, but didn't check it in a while. I'll check it again and report the result here (I won't be able to test the dev version, sorry, as this is a production system).

Comment 3 avlas 2016-09-09 13:34:02 UTC

It doesn't work properly for me yet in KDE neon user edition (it might be fixed in dev edition though).

So far best way I can get a nice display is by forcing the font dpi.

Comment 4 Christoph Feck 2016-09-10 16:40:57 UTC

Qt is currently limited to integral scaling factors, so there should be a difference, if you set the factor to 2.0.

Non-Qt applications are not affected by this setting.

Comment 5 avlas 2016-09-10 16:55:54 UTC

I tried with 1.4, so that must be it. I think a factor 2 is too big for my system, so I rather keep it as it is for now...

Any plan of allowing for lower scaling factors?

Comment 6 Sebastian Kügler 2016-09-10 17:28:55 UTC

Yes, but that will need support throughout the stack.

Comment 7 Joe Dai 2016-09-10 22:53:47 UTC

Updating to KDE Frameworks 5.6.5, scaling DOES scale icons! Font/text still wouldn't scale, but I'll just use force font DPI for that.