Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751496AbWINJSk (ORCPT ); Thu, 14 Sep 2006 05:18:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751495AbWINJSk (ORCPT ); Thu, 14 Sep 2006 05:18:40 -0400 Received: from atrey.karlin.mff.cuni.cz ([195.113.31.123]:7622 "EHLO atrey.karlin.mff.cuni.cz") by vger.kernel.org with ESMTP id S1751493AbWINJSj (ORCPT ); Thu, 14 Sep 2006 05:18:39 -0400 Date: Thu, 14 Sep 2006 11:18:49 +0200 From: Pavel Machek To: Jim Gettys Cc: Jordan Crouse , "Brown, Len" , Linux Kernel ML , Dominik Brodowski , ACPI ML , Adam Belay , "Pallipadi, Venkatesh" , Arjan van de Ven , devel@laptop.org, Bjorn Helgaas Subject: Re: ACPI: Idle Processor PM Improvements Message-ID: <20060914091849.GA15102@elf.ucw.cz> References: <20060830194317.GA9116@srcf.ucam.org> <200608311713.21618.bjorn.helgaas@hp.com> <1157070616.7974.232.camel@localhost.localdomain> <20060904130933.GC6279@ucw.cz> <1157466710.6011.262.camel@localhost.localdomain> <20060906103725.GA4987@atrey.karlin.mff.cuni.cz> <20060906145849.GE2623@cosmic.amd.com> <20060912092100.GC19482@elf.ucw.cz> <1158084871.28991.489.camel@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1158084871.28991.489.camel@localhost.localdomain> X-Warning: Reading this can be dangerous to your mental health. User-Agent: Mutt/1.5.11+cvs20060126 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1820 Lines: 43 On Tue 2006-09-12 14:14:30, Jim Gettys wrote: > On Tue, 2006-09-12 at 11:21 +0200, Pavel Machek wrote: > > > Ok, so what is needed is message to X "we are suspending", and X needs > > to respond "okay, I'm ready, no need for console switch". > > This presumes an external agent to X controlling the fast > suspend/resume, with messages having to flow to and from X, and to and > from the kernel, with the kernel in the middle. > > Another simpler option is X itself just telling the kernel to suspend > without console switch, as the handoff of the display to the DCON chip > has to be done with X and with an interrupt signaling completion of the > handoff. This would be triggered by an inactivity timeout in the X > server. Whoa... that's a hack.. but yes, you can probably do that, and I think kernel even has neccessary interfaces already. (They were needed for uswsusp). > > Alternatively, hack kernel to take control from X without actually > > switching consoles. That should be possible even with current > > interface. > > This would require saving/restoring all graphics state in the kernel > (and X already has that state internally). Feasible, but seems like Hmm, save/restore graphics state from the kernel would of course be clean solution, but you should have that anyway... what if someone suspends without X running? And of course you can just cheat, and not do kernel save-state on your system. 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/