With help of a friend I created a new (custom) kernel package, with the
2.6.28 kernel from Kubuntu 9.04 (downloaded source, used ubuntu kernel
patch, created .deb's for image & headers). My "uname -a" now is "Linux
htpc 2.6.28.10-custom #1 SMP Tue Nov 3 10:50:01 CET 2009 x86_64
GNU/Linux": I can successfully boot, but I still have the same problem.
As soon as I log on with KDE, the log is spammed with above USB reset
messages.

Conclusion: I was probably too soon with my assumption that the kernel
is to blame. Maybe this has something to do with KDE probing USB
ports/devices, thus screwing something up?

Something else: I checked the dmesg output on my PC at work (which is
running KUbuntu 9.10), and it contains some "CPU0 attaching NULL sched-
domain etc etc" as well. Maybe this is not part of the bug; I do not
know what causes these CPU messages.

-- 
KUbuntu installation on USB has very poor performance since 9.10
https://bugs.launchpad.net/bugs/468978
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