Version: (using KDE 4.2.1) OS: Linux Installed from: Ubuntu Packages From time to time, some of line edit widgets (I think no other do it) don't get repainted correctly - I guess the background isn't cleared correctly. Sometimes just the background of the edit widget is black, sometimes the background seems to be completely uninitialized (e.g. previous text remains, or the background looks like it contains some random part of memory (or previous background, only used with different width - so the bg. image is skewed badly)). It happened in a pure Qt app, and also in the runner plasma widget (in the 'command line' of it). Doesn't seem to affect the gtk apps (at least not firefox). This happens with all the fancy composite stuff disabled - doesn't seem to appear with kwin+opengl composite mode.
Created attachment 32305 [details] preview of affected line edit
Comment on attachment 32305 [details] preview of affected line edit At first the box was drawn correctly - then I clicked where the black box ends and pressed left arrow until I got to the beginning of the box. This way the background got scrambled...
Created attachment 32306 [details] genuine contents of kmail "create filter" window... screenshot of kmail window, the black background is original (and should be white with some string contents....). Also notice the uncorrectly repainted subject line edit...
Created attachment 32307 [details] uninitialized background sample also kmail window, captured a few seconds later than the first kmail screenshot. This time, the 'uninitialized background' phenomenon occurs - the lineedit on the left contains previous contents along with newly typed text. On the right, the black backrounds contains some white 'dots', seems like the 'skew' effect I mentioned...
Sounds like graphics corruption. What is your graphics card and drivers ? Thanks
yes, this probably is somehow connected to the graphics card - it's radeon, using opensource drivers (xserver-xorg-video-ati 6.12.1 + x.org 7.4). I'll try to investigate this a bit more (unsless I start to use composite - which however still has some showstoppers, like slow konsole/yakuake, for me) - I'm aware that the screenshots aren't really that helpful :)
after changing from EXA to XAA accelmethod, the bug seems to have disappeared... thus I'm going to fill the bug to some ati bugzilla :-)
I'm glad it works now. Marking this as UPSTREAM.