This was resolved (for me) by adding acpi=force to the kernel.
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https://bugs.launchpad.net/bugs/579930
Title:
aplay -l reports no soundcards, although the kernel clearly recognizes
my
** Attachment added: "AlsaDevices.txt"
http://launchpadlibrarian.net/48384566/AlsaDevices.txt
** Attachment added: "BootDmesg.txt"
http://launchpadlibrarian.net/48384567/BootDmesg.txt
** Attachment added: "Card0.Amixer.info.txt"
http://launchpadlibrarian.net/48384568/Card0.Amixer.info.t
Public bug reported:
Binary package hint: pulseaudio
I'm using 10.04. This happens in both i686 and x86_64 variants.
Currently I am using the x86_64 one.
Sometimes, after a normal boot (I can't see any error messages) my sound
card will not work (aplay reports no sound cards). A simple reboot
us