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

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Message-Id: <201001252217.39778.rjw@sisk.pl>
Date:	Mon, 25 Jan 2010 22:17:39 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, 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 Monday 25 January 2010, Jesse Barnes wrote:
> On Mon, 25 Jan 2010 18:43:50 +0000
> Alan Cox <alan@...rguk.ukuu.org.uk> wrote:
> 
> > > 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.
> > 
> > You can have a mix of KMS and non KMS consoles active on different
> > cards. So I don't think that is the case.
> 
> I pity users with that configuration.
> 
> But in that case we should be able to disable the VT switch disable
> path; we just have to check each driver as it's loaded.

OK, what the right sequence of checks would be in that case and where to place
them?

Rafael
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