From mboxrd@z Thu Jan 1 00:00:00 1970 From: Nate Lawson Subject: Re: Still problems with ACPI sleep state Date: Fri, 25 Jun 2004 23:30:35 -0700 (PDT) Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <20040625232835.R6228@root.org> References: <200406251547.21050.mailinglisten@merula.de> <1088172763.1918.1.camel@camel> <20040625211440.P5510@root.org> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Return-path: In-Reply-To: Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Michael Frank Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org [context recovered] On Sat, 26 Jun 2004, Michael Frank wrote: > On Fri, 25 Jun 2004 21:15:21 -0700 (PDT), Nate Lawson wrote: > > On Fri, 25 Jun 2004, Herman Sheremetyev wrote: > >> Try booting with acpi_sleep=s3_bios, I had the same problem on my Asus > >> M6N and that made the LCD come back on after an S3 resume. > >> > >> -Herman > > > > Could someone familiar with Linux let me know what s3_bios does > > differently from a normal S3? > > > > -Nate > > The suspend is performed in the BIOS without OS interaction. > > BIOS grabs CPU/its state, suspends devices, saves state, powers down > and on powerup restores state, resumes devices, releases its state/CPU. > > (more or less) > > In short, BIOS does all the work. Used to be like that before ACPI. > And few systems do it now like that... I could use a bit more technical response. For instance, are SLP_TYP_A/B written to a different register? If so, which? Does the system transition to legacy mode (disabling ACPI), trigger APM suspend, then re-enable ACPI on resume? What caveats are there? -Nate ------------------------------------------------------- This SF.Net email sponsored by Black Hat Briefings & Training. Attend Black Hat Briefings & Training, Las Vegas July 24-29 - digital self defense, top technical experts, no vendor pitches, unmatched networking opportunities. Visit www.blackhat.com