I updated my Ubuntu Gutsy a few hours ago and sound suddenly stopped working. I'm on a Thinkpad T61. Pressing the volume keys that are built into the laptop display the popup volume meter but the bar is empty and refuses to move. Running gnome-volume-control gives me a dialog saying "No volume control Gstreamer plugins and/or devices found." I'm new to Linux but it seems standard from reading other bugs trying to solve this one to post this info:

$ lspci |grep -i audio
00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)

$ dpkg -l |grep -i sound
rc  alsamixergui                               0.9.0rc2-1-9                         graphical soundcard mixer for ALSA soundcard driver
ii  esound                                     0.2.38-0ubuntu3                      Enlightened Sound Daemon - Support binaries
ii  esound-common                              0.2.38-0ubuntu3                      Enlightened Sound Daemon - Common files
rc  gamix                                      1.99.p14.debian1-4ubuntu1            Graphical sound mixer for ALSA
ii  libarts1c2a                                1.5.7-1ubuntu3                       aRts sound system core components
ii  libartsc0                                  1.5.7-1ubuntu3                       aRts sound system C support library
ii  libasound2                                 1.0.14-1ubuntu6                      ALSA library
ii  libesd-alsa0                               0.2.38-0ubuntu3                      Enlightened Sound Daemon (ALSA) - Shared libraries
ii  libsoundtouch1c2                           1.3.0-2.1                            sound stretching library
ii  linux-sound-base                           1.0.14-1ubuntu1                      base package for ALSA and OSS sound systems
rc  qjackctl                                   0.2.22-2ubuntu1                      User interface for controlling the JACK sound server
ii  sound-juicer                               2.20.0-1ubuntu2                      GNOME 2 CD Ripper
ii  soundtracker                               0.6.8-2                              Sound module editor/player. Supporting .xm and .xi
ii  sox                                        13.0.0-1build1                       Swiss army knife of sound processing
ii  ubuntu-sounds                              0.6                                  Ubuntu's GNOME audio theme