Adding of "options snd-hda-intel model=generic" to /etc/modprobe.d/alsa- base.conf fixed the same problem for me. Before I had "options snd-hda- intel probe_mask=1 model=auto" there. Now sound in 12.04 works fine.
During problem investigation I found following: I have Ubuntu 8.04 installed on my PC. When I reboot to 8.04 -- sound works fine in it. Then I reboot to 12.04 and sound continuing working there too. But when I switch off PC and boot directly to 12.04 -- "Dummy output" problem appears. Seems like it is some sound card initiation (or auto detection) problem.. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/994746 Title: hda-intel: spurious response and no sound in Ubuntu 12.04. Worked in 10.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/994746/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
