If you plug sth in the Red lineout rear, does the UI detect your
plugging (gnome-sound-setting).
When the Red lineout rear jack is plugged sth, please run "sudo
hdajacksensetest -c 1 -a", and upload the output.
Does the rest 3 lineout jacks (maybe black color jacks) work well?
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Thank you for taking the time to report this bug and helping to make
Ubuntu better.
How far did you get in troubleshooting sound? ie. did you attempt to
follow https://help.ubuntu.com/community/SoundTroubleshootingProcedure
or another wiki site?
I believe a Support site would be more
