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

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Message-ID: <20100203152443.7ce8b340@strolchi>
Date:	Wed, 3 Feb 2010 15:24:43 +0100
From:	Stefan Seyfried <stefan.seyfried@...glemail.com>
To:	Pavel Machek <pavel@....cz>
Cc:	"Rafael J. Wysocki" <rjw@...k.pl>, airlied@...ux.ie,
	LKML <linux-kernel@...r.kernel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Eric Anholt <eric@...olt.net>,
	pm list <linux-pm@...ts.linux-foundation.org>,
	dri-devel@...ts.sourceforge.net,
	Alan Cox <alan@...rguk.ukuu.org.uk>
Subject: Re: [linux-pm] [PATCH] PM / i915: Skip kernel VT switch during
 suspend/resume	if KMS is used

On Sun, 31 Jan 2010 09:54:19 +0100
Pavel Machek <pavel@....cz> wrote:

> On Thu 2010-01-28 00:07:51, Stefan Seyfried wrote:
> > Hi,
> > 
> > On Tue, 26 Jan 2010 15:58:43 +0100 Pavel Machek <pavel@....cz> wrote:
> > > We need vt switch when display is controlled by userland app directly
> > > accessing hw. It may or may not be X (svgalib anyone?,
> > > gtk-on-framebuffer? qtopia?).
> > 
> > anything-on-framebuffer should not be different from plain framebuffer
> > console, or am I missing something?
> 
> It is. At least svgalib accesses hw directly. It probably can run even
> on framebuffer.

If it accesses hw directly, it's not really "anything-on-framebuffer"
anymore, is it? The framebuffer device is there to abstract the
hardware.
 
> Well, for now the "shadow buffer" contains only text, not graphics
> images. So you'd need to enlarge it a lot. Doable but more than one liner.

Yes, noticed this today. I was using bootsplash-patched kernels, which
are obviously different in this aspect, so that shifted my view on
reality ;)
-- 
Stefan Seyfried

"Any ideas, John?"
"Well, surrounding them's out."
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