Re: commit b1ef29725865 (ACPI _REV=2) causes sound regression on Dell XPS 13 [Was: Discussion around quirking the _REV behavior for the XPS 13 (2015) until 4.2]

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On 05/12/2015 11:18 AM, Mark Brown wrote:

Please fix your mail client to word wrap within paragraphs and leave
blank lines between paragraphs.  Your current mail client is doing
neither which makes your mails hard to read.

Sorry about that, I've adjusted my mail client settings.

You need PulseAudio 6.0 but otherwise yes, it works for me.
Ubuntu 15.04 is running Pulseaudio 6.0.

That wasn't my question.  I'm asking what else the firmware is changing
based on detecting Linux, we don't want to just move onto a different
set of bugs somewhere else.

These are the different flows supported and what changes in the different flows.
This is up to date as of BIOS A03:

When Linux is detected (_OSI Windows 2013 & _REV 5):
* EC configures the audio controller for HDA mode on next cold boot.
* HDA audio device is included in PCI address space.
* Touchpad is put into I2C mode.

When Windows 8.1 is detected or currently Linux 4.1 (_OSI Windows 2013 & _REV 2):
* EC configures the audio controller for I2S mode on next cold boot.
* ADSP audio device included in ACPI (INT3438).
* Touchpad is put in I2C mode.

When Windows 7 is detected (_OSI Windows 2009):
* EC configures the audio controller for HDA mode on the next cold boot.
* HDA audio device included in PCI address space.
* Touchpad is put in PS2 mode.

I'm not seeing any of the hw_params() issues with v4.1 - are you perhaps
using an old linux-firmware?  I don't know how up to date Ubuntu is
there.
linux-firmware ubuntu 15.04 version: 1.143.
This is based off upstream cef33368c4d3425f11306496f0250f8ef1cf3c1f, updated on March 4 2015.
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