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1b1ed1a
(Get the code!)
I have also just been affected by this bug.
I have been using Ubuntu 14.04 fine from June until now, but I just had a lockup which caused this issue for me.
I have the Asus Xonar DS PCI sound card in an Asus M5A97 EVO motherboard.
I was running DOTA2 via Steam at the same time as Mumble 1.2.8, with the audio outputted to my headphones, and the microphone on the soundcard selected (and being picked up from my headphones).
I Alt-Tabbed from the game to alter the volume for Steam / DOTA2 in the Applications tab of Sound, and when I returned to the game I got a lockup which required that I restart my machine.
After restart I now have the behaviour described in this bug - the SPDIF input is selected by default and if I select Microphone, and come back into Sound the SPDIF input has been reselected.