I found the reason: The alsa driver snd_hda_intel has a problem with this particular hardware. I had to disable MSI interrupt handling for this module with a line options snd-hda-intel enable_msi=0 in /etc/modprobe.d/alsa_local.conf and then it worked.
Bug can be closed. -- Claus Fischer <claus.fisc...@clausfischer.com> http://www.clausfischer.com/
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