Bug 1267756

Summary:	Audio is broken on Dell XPS 13 as of Linux 4.2+
Product:	[Fedora] Fedora	Reporter:	Mykola Dvornik <mykola.dvornik>
Component:	kernel	Assignee:	Kernel Maintainer List <kernel-maint>
Status:	CLOSED DUPLICATE	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	23	CC:	gansalmon, itamar, jforbes, jonathan, kernel-maint, madhu.chinakonda, mchehab, mykola.dvornik
Target Milestone:	---
Target Release:	---
Hardware:	x86_64
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-10-01 15:17:06 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Mykola Dvornik 2015-09-30 21:26:40 UTC

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 

CONFIG_ACPI_REV_OVERRIDE_POSSIBLE=y 

added to the Linux 4.2+ builds
 

Version-Release number of selected component (if applicable):

Linux 4.2+

How reproducible:

Persistent

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+.

Actual results:

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.

Expected results:

Fully working audio system.

Additional info:

Comment 1 Justin M. Forbes 2015-10-01 15:17:06 UTC

The proper solution here is to update your firmware to revision A05 or newer, this makes the ACPI override unneccesary.

Comment 2 Mykola Dvornik 2015-10-01 18:23:13 UTC


*** This bug has been marked as a duplicate of bug 1255070 ***