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

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Message-Id: <201001252254.37635.rjw@sisk.pl>
Date:	Mon, 25 Jan 2010 22:54:37 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	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, Alan Cox wrote:
> > > 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?
> 
> Why are we even driving a vt switch direct from the suspend/resume
> logic ? The problem starts there. If it was being handled off the device
> suspend/resume method then there wouldn't be a mess to start with ?
> 
> Start at the beginning
> 
> - Why do we switch to arbitarily chosen 'last vt'
> - Why isn't vt related suspend/resume handled by the device

Well, that was added long ago as a workaround for some problems people
reported (presumably).  I've never looked at that before, so I can't really
tell why someone did it this particular way.

Obviously I'd like to clean it up, though.

So, what device should handle this in your opinion?

Rafael
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