^^^ Confirmed on an XPS 13 9350 too. And the 'Headphone Mic Boost' workaround works. Although like others, I find that concerning since it should in theory make the problem worse or make no difference.
Also confirmed the problem persists with: * 3-contact earphones (Sony) * 4-contact Apple Earpods * 4-contact Bose AE2 headphones (Apple-compatible cable) All of these experience the hiss, but the Bose almost none (much harder to notice). I think the most interesting test should be to try some proper Android/Samsung/Nokia wired headphones/earphones in future. If it turns out there's nothing wrong with the physical connection then this sounds like a kernel problem still. kaihengfeng: I have just tested your kernel on zesty and it made no difference. The problem remains and the same old amixer workaround is required. -- 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: XPS 13 9360 and 9350, Realtek ALC3246, Headphone audio hiss Status in alsa-driver package in Ubuntu: Confirmed Status in linux package in Ubuntu: Confirmed 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/ubuntu/+source/alsa-driver/+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
