From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ondrej Zary Subject: Re: [RFC] Reliable video POSTing on resume Date: Sat, 05 Feb 2005 12:53:37 +0100 Message-ID: <4204B3C1.80706@rainbow-software.org> References: <20050122134205.GA9354@wsc-gmbh.de> <1107474198.5727.9.camel@desktop.cunninghams> <4202DF7B.2000506@gmx.net> <9e47339105020321031ccaabb@mail.gmail.com> <420367CF.7060206@gmx.net> <20050204163019.GC1290@elf.ucw.cz> <9e4733910502040931955f5a6@mail.gmail.com> <1107569089.8575.35.camel@tyrosine> <9e4733910502041809738017a7@mail.gmail.com> <1107569842.8575.44.camel@tyrosine> <9e47339105020418306a4c2c93@mail.gmail.com> <1107591336.8575.51.camel@tyrosine> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit In-Reply-To: <1107591336.8575.51.camel@tyrosine> Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Matthew Garrett Cc: Jon Smirl , Pavel Machek , Carl-Daniel Hailfinger , ncunningham-jjFNsPSvq+iXDw4h08c5KA@public.gmane.org, ACPI List , Linux Kernel Mailing List List-Id: linux-acpi@vger.kernel.org Matthew Garrett wrote: > On Fri, 2005-02-04 at 21:30 -0500, Jon Smirl wrote: > > >>I suspect the problem in that case is a compressed VBIOS. Some laptops >>compress the VBIOS and the system BIOS into a single ROM and then >>expand them at power on. Sounds like this is not happening on resume. >>To get around the problem copy the image from C000:0 before suspend to >>a place in preserved RAM where wakeup.S can find it and then copy it >>back to C000:0 on resume. To test for this checksum C000:0 before >>suspend and after and see if it has changed. > > > No, that's not what's happening. If you disassemble the code at > c000:blah in a laptop, you'll often find that it jumps off to a > completely different section of address space. During POST, that > contains video BIOS. After POST, it may be something like USB boot > support. Without reading it directly out of flash, it's not possible to > recover that code. I wonder how this can work: a motherboard with i815 chipset (integrated VGA), Video BIOS is integrated into system BIOS a PCI card inserted into one of the PCI slots, configured as primary in system BIOS During POST, the PCI card BIOS is initialized. I boot Windows 98SE - then the onboard VGA initializes and I can use 2 monitors. So either: 1. The driver can initialize the onboard VGA on its own (without VGA BIOS) or 2. There is a way how to get the onboard VGA BIOS code from system BIOS -- Ondrej Zary ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl