Marking invalid since OP can longer reproduce it.
** Changed in: alsa-driver (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/996546
Title:
Lost headphone sound
I just got it working, but have absolutely no idea how or why.
I modified some BIOS settings (related mostly to virtualization, but also a
couple of security settings) in order to run a virtual machine (completely
unrelated to the sound issues) and either this or something else that happened
ar