I was experiencing this bug. With the upgrade to kernel
3.19.0-21-generic, the issue seemed to go away and my HDMI audio out
returned. However, if the computer goes to sleep the HDMI audio
disappears again. Restarting the computer is the only solution I have
found to bring it back, but it again
Public bug reported:
Most of the time when computer is put into suspend it immediately wakes
back up. On rare occassion the computer has been observed to be
successfully indefinitely suspended. This problem has existed since at
least bios version 1.58, and on Ubuntu 13.04, 13.10, and 14.04.
I
** Attachment added: wakeup
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1316221/+attachment/4117654/+files/wakeup
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https://bugs.launchpad.net/bugs/1316221
I can confirm this problem has existed since at least bios version 1.58,
and on Ubuntu 13.04, 13.10, and 14.04. Occassionally the computer will
go into proper suspension (and remain there until manually awoken), but
most often it will suspend and immediately wake back up.
I am running a Lenovo
Immediately after posting the above messages, I attempted to put the
computer into suspend using the GUI dropdown menu button. The computer
suspended and immediately woke back up.
I have attached the dmesg following this second attempt, though I do not
know if it is of any use.
** Attachment
I am having the same problem. I am not sure if this will be of any
assistance, but another user is having the exact same problem with Mint
(perhaps reinforcing the idea the issue is BIOS related) -
http://forums.linuxmint.com/viewtopic.php?f=49t=138873
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