I observe this on my XPS 13 9360. As mentioned by others, the headphone hissing goes away when I mute the system or when I run "amixer -c0 sset 'Headphone Mic Boost' 10dB". I created an even in /etc/acpi/events to call run this whenever headphones are inserted so that it persists after reboot.
Has anyone had luck advising Dell of the suspected hardware issue? James -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1654448 Title: Dell XPS 13 9350/9360 headphone audio hiss Status in Dell Sputnik: Confirmed Status in alsa-driver package in Ubuntu: Confirmed Status in linux package in Ubuntu: In Progress Status in pulseaudio package in Ubuntu: Confirmed Bug description: 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 To manage notifications about this bug go to: https://bugs.launchpad.net/dell-sputnik/+bug/1654448/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
