Re: [PATCH 6/6] PM/FB/gxfb: add config option that allows disabling of VT switch during suspend

[Pavel Machek <pavel@ucw.cz>]

On Mon 2008-03-10 14:19:39, Andrew Morton wrote:
> On Sat, 8 Mar 2008 20:49:27 -0500
> Andres Salomon <dilinger@queued.net> wrote:
> 
> > This is purely for suspend/resume time optimization.
> > 
> > 
> > >From 874aa20022a2501a30704163ed31a7baba7de9e5 Mon Sep 17 00:00:00 2001
> > From: Andres Salomon <dilinger@debian.org>
> > Date: Wed, 5 Mar 2008 16:40:25 -0500
> > Subject: [PATCH] PM: add config option that allows disabling of VT switch during suspend
> > 
> > Prior to suspend, we allocate and switch to a new VT; after suspend, we
> > switch back to the original VT.  This can be slow, and is completely
> > unnecessary if the framebuffer we're using can restore video properly.
> > 
> > This adds CONFIG_DISABLE_SUSPEND_VT_SWITCH which allows the user to
> > select whether or not to do that switch.  This has been tested with the
> > gxfb driver (on a Geode GX dev board and OLPC prototype machines).  In
> > order for the user to even see this option, a framebuffer has to declare
> > support for it (via CONFIG_FBDEV_SUPPORTS_NOSWITCH).
...
> It would be far preferable to do this via a kernel boot parameter rather
> than via a kernel rebuild.

Actually, it would be better to get this right automatically, without
any config options.

And no, this is not only gxfb/lxfb.  At least Sharp Zaurus and FIC
neo1973 can suspend without switching consoles... 
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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