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

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Message-ID: <20100125212720.7d3af280@lxorguk.ukuu.org.uk>
Date:	Mon, 25 Jan 2010 21:27:20 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
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

> > 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

Alan
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