linux-kernel - Re: [PATCH] Add a quirk for the Dell XPS 13 (2015) when in PS/2 mode.

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Message-ID: <550725D9.20805@dell.com>
Date:	Mon, 16 Mar 2015 13:50:01 -0500
From:	Mario Limonciello <mario_limonciello@...l.com>
To:	Jason Ekstrand <jason@...kstrand.net>
CC:	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	Pali Rohár <pali.rohar@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	Rob <robr.bensson@...il.com>
Subject: Re: [PATCH] Add a quirk for the Dell XPS 13 (2015) when in PS/2 mode.


On 03/16/2015 12:10 PM, Jason Ekstrand wrote:
> On Mon, Mar 16, 2015 at 7:29 AM, Mario Limonciello
> <mario_limonciello@...l.com> wrote:
> It's nothing about the wireless.  I swapped it out for an intel card
> on day 3 or so.
>
> Yes, I am almost 100% sure that this affects suspend/resume.  Prior to
> the _REV hack, my laptop *never* suspended correctly.  Now it
> regularly suspends just fine.  I also double-checked that rebasing on
> Linus' master didn't affect it.  With the _REV hack it doesn't
> suspend.  Without it, it's just fine.
>
> I don't know much about suspend/resume but is it possible that the
> problem is the kernel not being able to properly shut down the sound
> card?
Thanks for that confirmation.  That does sound like a very likely candidate that it was because the audio device was in the wrong state.

> That matches what I've seen.  With the _REV hack, I see nothing about
> HDA in dmesg and I get different audio messages than with an _OSI of
> Windows 2009.
>
> I look forward to seeing the update.  Thanks for working on this!
> --Jason Ekstrand
Sure.  In in the interim, here is the patch you can apply to your local DSDT and put in the initramfs to see what it will look like w/ A02.  This will leave the touchpad in I2C and audio in HDA.

--- DSDT.A01    2015-02-18 18:12:44.891286890 -0600
+++ DSDT.A02    2015-03-03 23:17:24.075746660 -0600
@@ -21567,6 +21567,7 @@
                  {
                      ACOS = 0x80
                      ACSE = Zero
+                    OSTP = One
                  }
              }
          }

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