I am also affected by this bug. Everything was fine until I activated
the restricted driver for my modem. Upon reboot, no sound, and no sound
hardware registered in alsamixer or pulseaudio. Issuing 'sudo alsa
force-reload' restored sound and placed my sound hardware back in
pulseaudio's hardware tab.
cat /proc/asound/card*/codec* | grep Codec:
Codec: Realtek ALC268
Codec: Motorola Si3054
lspci -v:
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio
Controller (rev 03)
Subsystem: Hewlett-Packard Company Device 30cc
Flags: bus master, fast devsel, latency 0, IRQ 31
Memory at f8400000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: HDA Intel
Kernel modules: snd-hda-intel
sudo alsa force-reload:
lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system
/home/briandoe/.gvfs
Output information may be incomplete.
Terminating processes: 1140lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon
file system /home/briandoe/.gvfs
Output information may be incomplete.
1864lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system
/home/briandoe/.gvfs
Output information may be incomplete.
4171lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system
/home/briandoe/.gvfs
Output information may be incomplete.
4198lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system
/home/briandoe/.gvfs
Output information may be incomplete.
(with SIGKILL:) 4240lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file
system /home/briandoe/.gvfs
Output information may be incomplete.
(failed: processes still using sound devices: 4285(pulseaudio)).
lsof: WARNING: can't stat() fuse.gvfs-fuse-daemon file system
/home/briandoe/.gvfs
Output information may be incomplete.
/sbin/alsa: Warning: Processes using sound devices: 4285(pulseaudio).
Unloading ALSA sound driver modules: snd-hda-codec-si3054 snd-hda-codec-realtek
snd-hda-intel snd-hda-codec snd-hwdep snd-pcm-oss snd-mixer-oss snd-pcm
snd-seq-dummy snd-seq-oss snd-seq-midi snd-rawmidi snd-seq-midi-event snd-seq
snd-timer snd-seq-device snd-page-alloc (failed: modules still loaded:
snd-hda-codec-si3054 snd-hda-codec-realtek snd-hda-intel snd-hda-codec
snd-hwdep snd-pcm snd-timer snd-page-alloc).
Loading ALSA sound driver modules: snd-hda-codec-si3054 snd-hda-codec-realtek
snd-hda-intel snd-hda-codec snd-hwdep snd-pcm-oss snd-mixer-oss snd-pcm
snd-seq-dummy snd-seq-oss snd-seq-midi snd-rawmidi snd-seq-midi-event snd-seq
snd-timer snd-seq-device snd-page-alloc.
--
[Karmic] processes holding /dev/dsp* or /dev/snd/pcm* cause "pulseaudio: card
not found - Null Output / Dummy Output"
https://bugs.launchpad.net/bugs/394500
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