linux-kernel - Re: [PATCH] PM / i915: Skip kernel VT switch during suspend/resume if KMS is used

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Message-ID: <20100125103525.2b766b9c@jbarnes-piketon>
Date:	Mon, 25 Jan 2010 10:35:25 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Len Brown <lenb@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	dri-devel@...ts.sourceforge.net, Eric Anholt <eric@...olt.net>,
	airlied@...ux.ie
Subject: Re: [PATCH] PM / i915: Skip kernel VT switch during suspend/resume
 if KMS is used

On Sun, 24 Jan 2010 00:55:59 +0100
"Rafael J. Wysocki" <rjw@...k.pl> wrote:

> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> If a non-KMS graphics driver is used, the kernel carries out a VT
> switch during suspend/resume to avoid possible problems with freezing
> X at a wrong time and to cause X to repaint everything after resume.
> 
> This is not necessary any more if the KMS is used, so skip the kernel
> VT switch during suspend/resume for i915 in the KMS mode.
> 
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> ---
> 
> Hi,
> 
> I've been testing this patch for over a week and haven't seen a
> single problem related to it during this time.
> 
> Are there any objections to it?

This probably belongs in the core DRM KMS code instead of the driver.
I can imagine that there may be some X driver code that still needs to
be executed on suspend/resume for some drivers, so this may introduce
bugs, but it's definitely the right way to go.

Dave?

-- 
Jesse Barnes, Intel Open Source Technology Center
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