Bug 356666

Summary:	Letters are randomly missing in Plasma notifications
Product:	[Plasma] plasmashell	Reporter:	Roman Odaisky <to.roma.from.kdebug>
Component:	Notifications	Assignee:	Martin Klapetek <mklapetek>
Status:	RESOLVED UPSTREAM
Severity:	normal	CC:	plasma-bugs-null
Priority:	NOR
Version First Reported In:	5.4.2
Target Milestone:	1.0
Platform:	Other
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Roman Odaisky 2015-12-14 10:00:31 UTC

For me, about half the time Plasma notifications in the corner of the screen are shown with half the letters randomly missing. Just blank spaces. For example, see http://qwertty.com/tmp/kde-notifications-missing-letters.png : it was supposed to say “Kopete: Connection trouble with Jabber...” but instead I got “K p   : C n   c      r  bl  wi h Jabb r ...”.

Googling suggests this isn’t limited to Plasma notifications (https://bugs.launchpad.net/ubuntu/+source/kubuntu-meta/+bug/1510959), possibly being a general Qt issue instead, but for me notifications are the only place where the problem occurs.

Reproducible: Sometimes

Comment 1 Martin Klapetek 2015-12-14 14:53:43 UTC

Thanks for the report

Can I please ask what's your graphics card and driver?

Comment 2 Roman Odaisky 2015-12-14 17:51:16 UTC

10de:0de1 VGA compatible controller: NVIDIA Corporation GF108 [GeForce GT 430] (rev a1)
nvidia-352-updates 352.63-0ubuntu0.15.10.1

Comment 3 Martin Klapetek 2015-12-14 18:07:10 UTC

I'm sorry to say that this is somewhat known Qt bug [1][2]
in combination with nvidia. There isn't much we can do about
it except recommending adding 

QML_USE_GLYPHCACHE_WORKAROUND=1

into your /etc/profile.d/ OR /etc/environment and rebooting.

Also might help if you add a comment to the Qt reports.
[1] https://bugreports.qt.io/browse/QTBUG-42386
[2] https://bugreports.qt.io/browse/QTBUG-36976