Public bug reported:
Binary package hint: kdebase-workspace
Setup:
Dell Vostro 1500, Core 2 Duo, nVidia GeForce 8400M (not currently used)
Installed Hardy alpha 6, Kubuntu-KDE4
To save someone 5 minutes of head scratching, I'll repeat: that's KDE4,
not KDE3. However, looking through the /etc/init.d/kdm script, I see
references to kde3, so not sure ... Konqueror->Help->About reports 4.0.2
I probably noticed the inefficient/multiple drawings because I am not
currently using my video card. I do, however, have a very fast system
so this shouldn't be so obvious.
Symptom: changing location of taskbar panel makes desktop redraw
multiple times. On this 2.2 GHz Core 2 Duo machine w/ 2G RAM, it takes
a noticeable 3-5 redraws and 8 or 9 seconds to finish.
Steps to reproduce:
1. Right-click on taskbar, choose "Panel Settings"
2. Change location of panel to orthogonal place. e.g bottom to left or right.
(Top doesn't trigger it as noticeably.)
3. Click Apply.
... Screen will redraw multiple times ...
Expected results: Desktop should redraw once, and only once, in a second
buffer and refresh the visible screen only once.
Suggestion 1: Disable your video card to really highlight inefficient behavior.
Suggestion 2: Also have another process hog the CPU(s) to really highlight the
inefficient behavior.
I note that after having changed the panel location three or four times
(to make sure that I can reproduce this behavior), the kdm program is
now hogging a core. I'll make two more bugs for that, about kdm hogging
cpu at all, and kde/kernel not utilizing second available core.
** Affects: kdebase-workspace (Ubuntu)
Importance: Undecided
Status: New
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kde4 customize taskbar redraws multiple times
https://bugs.launchpad.net/bugs/204136
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