Bug 308620

Summary:	Blurry text in inactive windows
Product:	[Plasma] kwin	Reporter:	Ross Burton <headrift>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	cfeck
Priority:	NOR
Version:	4.9.2
Target Milestone:	---
Platform:	Gentoo Packages
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	A cropped image of blurred text A cropped image of what it usually looks like

Description Ross Burton 2012-10-18 20:01:25 UTC

When changing window focus, the text in shown windows as well as some icons become blurry.

Reproducible: Always

Steps to Reproduce:
1.  Open a window with text in it.
2.  Remove focus from new window, not necessarily moving it under another window. 
Actual Results:  
Text in window becomes blurred.

Expected Results:  
Text is not blurred.

Happens with or without "blur" desktop effect, with or without font anti-aliasing, and with or without driver FSAA.  Effect most noticeable (maybe even worse) when removing focus by unhiding a plasma panel.  Problem exists independent of selected refresh rate.  Worse with gtk apps, less noticeable with qt apps, but that's mostly subjective.  Happens when moving cursor between screens, or when keeping the cursor on one screen.  Haven't found a workaround or any other fix.

System is 64 bit, nvidia-drivers are version 304.51 (on a 9500 GT card), dual monitors (both running at 1280x1024), two xorg screens.  xorg-server version is 1.12.4, kde is version 4.9.2, gtk-engines-qtcurve is 1.8.15, Gentoo system.

Comment 1 Christoph Feck 2012-10-18 23:31:24 UTC

Please add a screen shot (or two), showing the difference between active and inactive window (blurred and normal).

Comment 2 Ross Burton 2012-10-18 23:34:02 UTC

Created attachment 74641 [details]
A cropped image of blurred text

This is the blurry text I get when I repeat the steps above.

Comment 3 Ross Burton 2012-10-18 23:35:15 UTC

Created attachment 74642 [details]
A cropped image of what it usually looks like

This image is what it usually looks like without the blurry text.

Comment 4 Christoph Feck 2012-10-19 07:47:03 UTC

Are you using Mesa 9? Does the effect show with Compositing disabled (Shift+Alt+F12)?

Comment 5 Thomas Lübking 2012-10-19 11:47:49 UTC

run nvidia-settings, enter the "Antialiasing Settings", disable FXAA, run "kwin --replace &" - last one is important, because the setting only ppplies to new processes.

probably dupe of #307003

@christoph
the nvidia blob "bypasses" mesa

Comment 6 Ross Burton 2012-10-19 13:46:12 UTC

(In reply to comment #5)
> run nvidia-settings, enter the "Antialiasing Settings", disable FXAA, run
> "kwin --replace &" - last one is important, because the setting only ppplies
> to new processes.
> 
> probably dupe of #307003

That fixed it.  I didn't find #307003 in my bug search, sorry.  This is a duplicate of that problem.  Marked appropriately.

*** This bug has been marked as a duplicate of bug 307003 ***