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

From: Mario Limonciello
Date: Mon Mar 16 2015 - 14:50:24 EST

On 03/16/2015 12:10 PM, Jason Ekstrand wrote:
On Mon, Mar 16, 2015 at 7:29 AM, Mario Limonciello
<mario_limonciello@xxxxxxxx> 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
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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