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Today after I upgraded my Ubuntu 8.0.4 I noticed that audio didn't work anymore. I mean this:

$ sudo aplay -l
aplay: device_list:205: no soundcards found

$ find /lib/modules/`uname -r` | grep snd

And that's weird, because my sound card was being recognized before the upgrade, but also after:

00:10.1 Audio device: nVidia Corporation MCP51 High Definition Audio (rev a2)
        Subsystem: Micro-Star International Co., Ltd. Unknown device 4314
        Flags: bus master, 66MHz, fast devsel, latency 0, IRQ 5
        Memory at f9fd8000 (32-bit, non-prefetchable) [size=16K]
        Capabilities: <access denied>

And finally, this is the log my upgrade.

avahi-daemon (0.6.22-2ubuntu4.2) to 0.6.22-2ubuntu4.3
firefox (3.6.13+build3+nobinonly-0ubuntu0.8.04.1) to 3.6.15+build1+nobinonly-0ubuntu0.8.04.1
firefox-3.0 (3.6.13+build3+nobinonly-0ubuntu0.8.04.1) to 3.6.15+build1+nobinonly-0ubuntu0.8.04.1
firefox-3.0-gnome-support (3.6.13+build3+nobinonly-0ubuntu0.8.04.1) to 3.6.15+build1+nobinonly-0ubuntu0.8.04.1
firefox-branding (3.6.13+build3+nobinonly-0ubuntu0.8.04.1) to 3.6.15+build1+nobinonly-0ubuntu0.8.04.1
firefox-gnome-support (3.6.13+build3+nobinonly-0ubuntu0.8.04.1) to 3.6.15+build1+nobinonly-0ubuntu0.8.04.1
fuse-utils (2.7.2-1ubuntu2.2) to 2.7.2-1ubuntu2.3
libavahi-client3 (0.6.22-2ubuntu4.2) to 0.6.22-2ubuntu4.3
libavahi-common-data (0.6.22-2ubuntu4.2) to 0.6.22-2ubuntu4.3
libavahi-common3 (0.6.22-2ubuntu4.2) to 0.6.22-2ubuntu4.3
libavahi-compat-libdnssd1 (0.6.22-2ubuntu4.2) to 0.6.22-2ubuntu4.3
libavahi-core5 (0.6.22-2ubuntu4.2) to 0.6.22-2ubuntu4.3
libavahi-glib1 (0.6.22-2ubuntu4.2) to 0.6.22-2ubuntu4.3
libavahi-ui0 (0.6.22-2ubuntu4.2) to 0.6.22-2ubuntu4.3
libfuse2 (2.7.2-1ubuntu2.2) to 2.7.2-1ubuntu2.3
libpango1.0-0 (1.20.5-0ubuntu1.1) to 1.20.5-0ubuntu1.2
libpango1.0-common (1.20.5-0ubuntu1.1) to 1.20.5-0ubuntu1.2
libpango1.0-dev (1.20.5-0ubuntu1.1) to 1.20.5-0ubuntu1.2
libsmbclient (3.0.28a-1ubuntu4.13) to 3.0.28a-1ubuntu4.14
libtiff4 (3.8.2-7ubuntu3.6) to 3.8.2-7ubuntu3.7
linux-headers-generic ( to
linux-libc-dev (2.6.24-28.86) to 2.6.24-29.87
mplayer (2:1.0~rc2-0ubuntu13.1+medibuntu1) to 2:1.0~rc2-0ubuntu13.2
openssh-client (1:4.7p1-8ubuntu2) to 1:4.7p1-8ubuntu3
openssh-server (1:4.7p1-8ubuntu2) to 1:4.7p1-8ubuntu3
samba-common (3.0.28a-1ubuntu4.13) to 3.0.28a-1ubuntu4.14
smbclient (3.0.28a-1ubuntu4.13) to 3.0.28a-1ubuntu4.14
ssh (1:4.7p1-8ubuntu2) to 1:4.7p1-8ubuntu3
ssh-askpass-gnome (1:4.7p1-8ubuntu2) to 1:4.7p1-8ubuntu3
sun-java6-bin (6.22-0ubuntu1~8.04.1) to 6.24-1build0.8.04.1
sun-java6-jdk (6.22-0ubuntu1~8.04.1) to 6.24-1build0.8.04.1
sun-java6-jre (6.22-0ubuntu1~8.04.1) to 6.24-1build0.8.04.1
sun-java6-plugin (6.22-0ubuntu1~8.04.1) to 6.24-1build0.8.04.1
tzdata (2011b~repack-0ubuntu0.8.04) to 2011c~repack-0ubuntu0.8.04
winbind (3.0.28a-1ubuntu4.13) to 3.0.28a-1ubuntu4.14

linux-headers-2.6.24-29 (2.6.24-29.87)
linux-headers-2.6.24-29-generic (2.6.24-29.87)
linux-image-2.6.24-29-generic (2.6.24-29.87)

What should I do to recover my audio? Please help! Best regards.

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up vote 0 down vote accepted

The workaround to recover audio functionalities was to run the kernel version installed before the upgrade. This was easily done by pressing ESC at grub prompt and then selecting the previous kernel.

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