The patch attached fixed the problem on my XPS13 9333. I don't know which is the preferred way to fix the issue, but the problem is caused by AA-loopback. (Based on http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d2e92709e88d97c001b6bb96054ecb06d99d0dc6)
When the audio card goes from D0 to D3 and vice versa there's still the annoying pop noise and while in D3, there's some background noise, most likely caused by other components (I can for example hear the well known electrical noise of the XPS13 9333 owner, even if it's not that loud). However, as long as the audio card is in D0, there are no noises. ** Patch added: "0001-ALSA-hda-Disable-AA-loopback-on-ALC668.patch" https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1252733/+attachment/4111379/+files/0001-ALSA-hda-Disable-AA-loopback-on-ALC668.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1252733 Title: [XPS 12-9Q33, Realtek ALC668, Black Headphone Out, Left] Background noise or low volume To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/alsa-driver/+bug/1252733/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
