I see the same issue with vanilla sources 3.7.1 in gentoo. (and hardened sources), seems like an upstream kernel issue maybe? I reproduced via the following method.
1. boot 2. play sound (to verify working) 3. suspend / unsuspend 4. play sound (this fails) 5. dmesg :D T520 http://forums.gentoo.org/viewtopic-t-944996-highlight-disabling+lpib+delay+counting.html makes it seem like disabling hdmi support for hda-intel will 'fix' it. dmesg | grep hda [ 1.917634] snd_hda_intel 0000:00:1b.0: irq 45 for MSI/MSI-X [ 95.881768] snd_hda_intel 0000:00:1b.0: irq 45 for MSI/MSI-X [ 107.942919] hda-intel: azx_get_response timeout, switching to polling mode: last cmd=0x010f0600 [ 108.941656] hda-intel: No response from codec, disabling MSI: last cmd=0x010f0600 [ 109.942365] hda_intel: azx_get_response timeout, switching to single_cmd mode: last cmd=0x010f0600 [ 109.966911] hda-intel: Unstable LPIB (56856 >= 8192); disabling LPIB delay counting -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1088957 Title: [ThinkPad T420] hda-intel: spurious response - audio dropping out during playback To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1088957/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
