FWIW, I installed kernel 3.17 from http://kernel.ubuntu.com/~kernel-
ppa/mainline/v3.17-utopic/ which seems to resolve this issue.
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Public bug reported:
When listening with headphones or a headset, there's a constant
background noise with a hiss i the left ear and 'electronic warbling' in
the rigt ear.
ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu
This may be a simple dup of #1252733, although my specific hardware is
different.
Specifically, the hda-verb invocations from comment 34 make the
background noise go away:
hda-verb /dev/snd/hwC1D0 0x0c SET_AMP_GAIN_MUTE 0x5180
hda-verb /dev/snd/hwC1D0 0x0c SET_AMP_GAIN_MUTE 0x6180
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You
At some point, I stopped seeing the problem on my laptop. I'm afraid I
have no idea what package update (or other change) may have brought
about the resolution in the interim.
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Same symptoms for me, with the same workaround (switching to console and
back), on a Dell XPS-15-9530, freshly installed from 13.10 media on
2013-11-30.
This system includes both integrated and descrete graphics,
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor
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