Red Hat Bugzilla – Bug 1267756
Audio is broken on Dell XPS 13 as of Linux 4.2+
Last modified: 2015-10-01 14:23:13 EDT
Description of problem:
As of Linux 4.2+ the supported ACPI revision reported back to BIOS is set statically to '2' to match Windows behaviour. This breaks audio on Dell XPS 13 , since BIOS forces ASoC to operate in I2S mode that even Linux 4.3 does not support properly yet.
There is a work around that allows the reported ACPI revision to be forced via kernel parameter http://mailman.alsa-project.org/pipermail/alsa-devel/2015-May/092051.html.
So it would be nice to have
added to the Linux 4.2+ builds
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Operate FC23 using 4.1.x kernel and make sure that ASoC is in HDA mode.
2. Update kernel to 4.2+.
Audio is broken, i.e. only built-in speakers work. No MIC, crappy sound out of the headphone output. Toggling things in alasmixer doesn't help much.
Fully working audio system.
The proper solution here is to update your firmware to revision A05 or newer, this makes the ACPI override unneccesary.
*** This bug has been marked as a duplicate of bug 1255070 ***