From mboxrd@z Thu Jan 1 00:00:00 1970 From: Pavel Machek Subject: Re: [PATCH 6/6] PM/FB/gxfb: add config option that allows disabling of VT switch during suspend Date: Tue, 11 Mar 2008 00:05:11 +0100 Message-ID: <20080310230511.GA31750@elf.ucw.cz> References: <20080308204927.73afa56c@ephemeral> <20080310141939.ce1169c0.akpm@linux-foundation.org> Reply-To: linux-fbdev-devel@lists.sourceforge.net Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from sc8-sf-mx2-b.sourceforge.net ([10.3.1.92] helo=mail.sourceforge.net) by sc8-sf-list1-new.sourceforge.net with esmtp (Exim 4.43) id 1JYr2u-0005W1-AS for linux-fbdev-devel@lists.sourceforge.net; Mon, 10 Mar 2008 16:04:40 -0700 Received: from gprs189-60.eurotel.cz ([160.218.189.60]) by mail.sourceforge.net with esmtp (Exim 4.44) id 1JYr2r-0004FU-7U for linux-fbdev-devel@lists.sourceforge.net; Mon, 10 Mar 2008 16:04:40 -0700 Content-Disposition: inline In-Reply-To: <20080310141939.ce1169c0.akpm@linux-foundation.org> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: linux-fbdev-devel-bounces@lists.sourceforge.net Errors-To: linux-fbdev-devel-bounces@lists.sourceforge.net To: Andrew Morton Cc: linux-fbdev-devel@lists.sourceforge.net, adaplas@gmail.com, linux-kernel@vger.kernel.org, info-linux@geode.amd.com, "Rafael J. Wysocki" , jordan.crouse@amd.com, Samuel Thibault On Mon 2008-03-10 14:19:39, Andrew Morton wrote: > On Sat, 8 Mar 2008 20:49:27 -0500 > Andres Salomon wrote: > > > This is purely for suspend/resume time optimization. > > > > > > >From 874aa20022a2501a30704163ed31a7baba7de9e5 Mon Sep 17 00:00:00 2001 > > From: Andres Salomon > > 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 ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/