I have the same problem (clean gutsy install), also about 25% CPU usage all the
time. The bug is caused by the cx8800 module, which is used for a TV card. I
have found the same report on madriva bugzilla:
http://qa.mandriva.com/show_bug.cgi?id=32300
They have resolved this issue and fixed it with a patch in madriva.
Please, include this patch also in Ubuntu, as soon as possible, this is
really important. Thank you.
** Changed in: linux-source-2.6.22 (Ubuntu)
Status: New => Confirmed
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ksoftirqd/0 always using about 30% cpu time
https://bugs.launchpad.net/bugs/153195
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