** Description changed:
+ === 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.
+ 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.
+ 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
** Changed in: linux (Ubuntu)
Assignee: Kai-Heng Feng (kaihengfeng) => (unassigned)
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https://bugs.launchpad.net/bugs/1654448
Title:
Dell XPS 13 9350/9360 headphone audio hiss
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