Public bug reported:
Recently a new bug has started to bug me (pun intended). It involves a
temporary mismatch in redrawing an image in certain programs. Here are
two ways to reproduce:
1. Choose some simple repetetive wallpaper in kde ("All the good people"
supplied with kde in a tile mode is a good example)
2. Make sure you can actually see wallpaper under the icons.
3. Open some program window so that it occupies a big proportion of the screen,
but not everything (say 3/4 of the screen), so that the wallpaper is visible.
4. Move the window around rapidly with you mouse.
Results that I observe: the image is first repainted instantenously, but
slightly shifted compared to the correct image, and then it is repainted
_again_ this time in correct position. This happens quickly, but the
movement of the image several pixels can be seen during the second
repainting.
Alternatively, instead of moving window around one can minimize and
maximize window for the same effect.
Second way to reproduce:
1. Open the same image in say "kgwenview" zoom it so it takes whole screen, and
do the same. The effect is more easily seen when it is open in full screen
mode, but is present in non full-screen mode as well.
Note that since this bug requires that repainting to be slow enough, if
you have a significantly faster computer than I do, you might not be
ableo to reproduce it. So, to reproduce this bug I advise to run some
CPU intensive program in background. Maybe one also needs to disable
hardware graphics acceleration since my graphics card is some kind of
built-in chipset whose permormance has probably never been looked at.
My machine is Pentium IV 3Ghz running Kubuntu 6.0.6. According to System
Settings->Display->Hardware my graphics card is i810, but how accurate
that is I do not know.
If you need some additional information about the configuration or bug,
do not hesitate to ask.
--Boris
** Affects: Ubuntu
Importance: Undecided
Status: Unconfirmed
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Image shift when redrawing
https://launchpad.net/bugs/83529
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