** 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) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1654448 Title: Dell XPS 13 9350/9360 headphone audio hiss To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1654448/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs