** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Bionic)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1654448
Title:
Dell XPS 13 9350/9360 headphone audio hiss
Status in linux package in Ubuntu:
In Progress
Status in linux source package in Bionic:
Fix Committed
Bug description:
=== SRU Justification ===
[Impact]
XPS 13 9350/9360 has unbearlbe headphone noise after recent kernel
updates.
[Fix]
Lock Headphone Mic Boost level to 1 as an workaround to solve the issue.
[Test]
Plug a headphone to audio jack, the noise is really bad.
After applying the patch the noise is gone.
[Regression Potenial]
Low. This change only targets to 2 systems, so it has limited impact.
=== Original Bug Report ===
Pertaining to 16.04 on a dell XPS 13 9360
ii alsa-base 1.0.25+dfsg-0ubuntu5
Advanced Linux Sound Architecture Driver Version k4.4.0-57-generic.
When headphones are plugged in, there is a clearly audible hiss (white
noise). This is present as soon as the headphones are plugged in,
whether 'headphones' or 'headset' are selected from the pop-up box.
Using alsamixer to debug the issue reveals that it is related to
"Headphone Mic Boost" - the default setting is: dB gain 0.00, 0.00. If
this is changed to:
10.00, 10.00 (one notch up) the hiss disappears.
20.00, 20.00 cause a louder hiss and
30.00, 30.00 causes an even louder hiss with high frequency audio artifacts.
When the headphones are removed and plugged back in the Headphone Mic
Boost setting returns to dB gain 0 and the problem also returns.
This (problem and workaround) has been reported in the wild:
https://news.ycombinator.com/item?id=13050843 and
https://www.reddit.com/r/Dell/comments/4j1zz4/headphones_have_static_noise_with_ubuntu_1604_on/
for example
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