Public bug reported:
Some dynamic content areas -- the ones that come to mind are in Quassel
and Kate -- are filled up with garbage pixels that are (as far as I can
tell) grabbed from the rest of the screen at erratic times in KDE 4.2.
Quassel is the easy place to generate this bug: usually (but not
always!), if I click on the Quassel window to bring it to the foreground
when it is behind another window, some of the area covered by the
original window is filled with garbage apparently taken from various
places on the rest of the screen. If a chat room is active, it may also
happen when another window is dragged over Quassel, but that does not
always happen.
Once the garbage pixels exist, they stay constant, presumably cached by
something-or-other. Except for this fact: like I said, dragging a window
over Quassel doesn't always trigger the bug; but usually, if there are
already garbage pixels, window dragging can enlarge the area where they
occur and sometimes even change their contents.
Clearing the garbage pixels to "try again" (i.e., try to replicate them
under a similar scenario) is easy: just resize the window, and the
garbage pixels disappear when the window gets redrawn.
Kate is much more finicky, but will sometimes fill up with garbage
pixels when being scrolled with the cursor keys. (This is very random
and hard to reproduce consistently -- sometimes it happens, sometimes it
doesn't.)
Notably, disabling or enabling K > System Settings > Desktop > Enable
desktop effects does not change whether this bug is occurring or not.
Also notably, I'm using an integrated graphics card on my laptop to do
these, so this is probably not related to any outstanding graphics
driver bugs. My overall setup is a widescreen tablet PC with integrated
graphics, running the latest Kubuntu Jaunty alpha. All packages were up
to date as of this morning, and this bug has been occurring for much
much longer than that.
A screen capture of Quassel during one of these bugs is attached; I'll
also post a reply with a screen capture of the same in Kate. (Yes,
apparently GIMP can screen-capture it!)
** Affects: kubuntu-meta (Ubuntu)
Importance: Undecided
Status: New
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garbage pixels fill up dynamic content areas in KDE 4.2
https://bugs.launchpad.net/bugs/349020
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