linux-kernel - Re: [RFC] Suspend/resume without VT switches

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Message-ID: <2324361.keTRK1rkYL@vostro.rjw.lan>
Date:	Sat, 03 Nov 2012 00:38:54 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [RFC] Suspend/resume without VT switches

On Friday, November 02, 2012 04:29:37 PM Jesse Barnes wrote:
> On Fri, 02 Nov 2012 22:51:07 +0100
> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> 
> > On Friday, November 02, 2012 02:43:39 PM Jesse Barnes wrote:
> > > I've lightly tested this with X and it definitely makes my
> > > suspend/resume sequence a bit prettier.  It should speed things up
> > > trivally as well, but most of those gains come from other changes to the
> > > i915 driver (posted earlier to intel-gfx).
> > > 
> > > Any thoughts?
> > 
> > I like the idea.
> > 
> > > I suspect we'll have to be more defensive about the
> > > resume configuration in case the BIOS did something weird, but overall I
> > > think we should be able to do this one way or another.
> > 
> > Perhaps patch [1/2] should be [2/2] and vice versa? :-)
> 
> But then it wouldn't compile?  I added the variable first, defaulting
> to the current behavior, then made i915 support it and set the variable
> to false there...  At least, that's what I intended to do.

OK

So what happens if there are multiple graphics adapters in the system?
Including such that aren't handled by i915?  pm_vt_switch is global, so isn't
there any problem with that?

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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