Bug 125929

Summary:	Changing konsole font size produces inconsistent sizes after xrandr resolution switch
Product:	[Applications] konsole	Reporter:	Jukka Laurila <jplauril>
Component:	general	Assignee:	Konsole Developer <konsole-devel>
Status:	RESOLVED FIXED
Severity:	normal	CC:	khindenburg, sami.liedes
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:

Description Jukka Laurila 2006-04-20 02:39:23 UTC

Version:            (using KDE KDE 3.5.2)
Installed from:    Ubuntu Packages
OS:                Linux

To reproduce:

- start konsole
- set X to a low resolution mode using xrandr
- press ctrl-+ to enlarge the font
- press ctrl-- to reduce the font
- set X to a high resolution mode using xrandr
- press ctrl-+ to enlarge the font again

Expected result from last step: font gets bigger.
Actual result: font gets smaller.

Speculation: It seems like when a given font size is needed for the first time, konsole renders it into some cache based on the then-current DPI value of the screen. This cache is then not properly invalidated after the display resolution and DPI is changed with xrandr, and thus the font konsole gets from the cache is of the wrong size after the resolution change. Restarting konsole seems to clear this cache, and font resizing works as it should as long as the resolution stays the same.

Comment 1 Jukka Laurila 2006-04-21 23:25:00 UTC

This turned out to be a bug in Qt. See: http://www.trolltech.com/developer/tasktracker.html?method=entry&id=111388

Comment 2 Robert Knight 2006-08-07 18:07:02 UTC

Confirmed for now, it won't be possible to test the fix until Qt 3.3.7 is released.

Comment 3 Sami Liedes 2010-01-18 16:16:24 UTC

Tested in KDE 4.3.4 and works correctly for me (as also expected per comment #2). Suggest closing this bug.

Comment 4 Kurt Hindenburg 2010-01-18 16:29:18 UTC

Reopen if you can duplicate the issue again.