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]

[Mark Brown <broonie@kernel.org>]

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On Tue, May 12, 2015 at 10:26:24AM -0500, Mario Limonciello wrote:
> On 05/12/2015 05:12 AM, Mark Brown wrote:
> >On Mon, May 11, 2015 at 08:26:58PM +0200, Dominik Brodowski 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.

> >Also CCing Matthew who came up with the original version of the version
> >change and Liam who is one of Intel's audio experts.

> >>According to an off-list discussion, the sound breakage (and not just some
> >>jack detection issue) seems to be caused due to alsa-lib being too old.

> >Right, it needs the userspace configuration files installing.

> Is it just configuration files?  With 4.1-rc3 I've not been able to
> get sound working mucking with any mixers.

You need PulseAudio 6.0 but otherwise yes, it works for me.

> >>The matter is further complicated by the issue that the driver
> >>asks for some firmware blob intel/IntcPP01.bin which (at least) I
> >>cannot find anywhere.

> >As previously advised that firmware is optional.

> The errors in dmesg make it seem like that was related to the firmware
> missing, but that is a red herring it sounds like.

Yes, it is.

> >Does this also affect other behaviour of the system?  I'd be pretty
> >unhappy if it introduce power regressions for example, I mostly don't use
> >audio on my laptops but I care a lot about how long it'll run
> >disconnected.  It *is* quite a new laptop and my experience installing
> >was very much that it was in bringup (though quite a bit of this was
> >userspace).

> I just tried it with 4.1-rc3 from Ubuntu's mainline PPA and an Ubuntu
> 15.04 userspace.  It does affect the behavior of the system.    See
> all the PCM errors in dmesg:

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.

> https://bugzilla.kernel.org/attachment.cgi?id=176511

> At least with BIOS A03 (latest), Ubuntu 15.04 (3.19ish and modern
> userspace) or with 4.0 and recent userspace the experience shouldn't
> be bringup.

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.

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