Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755542AbYCJXEp (ORCPT ); Mon, 10 Mar 2008 19:04:45 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752374AbYCJXEg (ORCPT ); Mon, 10 Mar 2008 19:04:36 -0400 Received: from gprs189-60.eurotel.cz ([160.218.189.60]:55238 "EHLO gprs189-60.eurotel.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752496AbYCJXEf (ORCPT ); Mon, 10 Mar 2008 19:04:35 -0400 Date: Tue, 11 Mar 2008 00:05:11 +0100 From: Pavel Machek To: Andrew Morton Cc: Andres Salomon , adaplas@gmail.com, linux-kernel@vger.kernel.org, linux-fbdev-devel@lists.sourceforge.net, info-linux@geode.amd.com, jordan.crouse@amd.com, "Rafael J. Wysocki" , Samuel Thibault Subject: Re: [PATCH 6/6] PM/FB/gxfb: add config option that allows disabling of VT switch during suspend Message-ID: <20080310230511.GA31750@elf.ucw.cz> References: <20080308204927.73afa56c@ephemeral> <20080310141939.ce1169c0.akpm@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080310141939.ce1169c0.akpm@linux-foundation.org> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.17 (2007-11-01) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1763 Lines: 39 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/