After some investigation on my own, I found the reason: A outdated ppa
package for the Intet graphics which thought was automatically
uninstalled with the upgrade to Karmic. After installation of the Karmic
package xserver-xorg-video-intel everything works fine.
** Changed in: linux (Ubuntu)
** Attachment added: "AlsaDevices.txt"
http://launchpadlibrarian.net/34790824/AlsaDevices.txt
** Attachment added: "AplayDevices.txt"
http://launchpadlibrarian.net/34790825/AplayDevices.txt
** Attachment added: "ArecordDevices.txt"
http://launchpadlibrarian.net/34790826/ArecordDevices.t
