[SRU][B/C/D/unstable][PATCH v2 0/1] Fix the constant noise of headphone on lenovo X1 machines

[Hui Wang]

BugLink: https://bugs.launchpad.net/bugs/1817263

In the V2, I regenerated the patch based on the master-next branch of Disco, only the
0001-xxx.patch for Disco is changed in the V2, other patches are same as V1.

[Impact]
It is reported that there is constant noise on lenovo X1 machines, and after
investigating, I found this issue will happen on all Lenovo machines with the
codec alc285.

[Fix]
According to Realtek's comment, the noise comes from PC peeb in, after
disable this pin or disable the passthrough of this pin will fix the
problem.

[Test Case]
After applying this patch, we play sound on Lenovo P52, P72, X1 carbon and X1
Yoda2, no noise anymore. And this patch is confirmed to work by many other
users too (https://bugzilla.redhat.com/show_bug.cgi?id=1660581,
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1805079/comments/38).

[Regression Potential]
Low. This patch only apply to several lenovo machines, and it is tested
by many users already.


Hui Wang (1):
  ALSA: hda/realtek: Disable PC beep in passthrough on alc285

 sound/pci/hda/patch_realtek.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

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2.17.1