Messages in this thread | | | Date | Sat, 05 Feb 2005 12:53:37 +0100 | From | Ondrej Zary <> | Subject | Re: [RFC] Reliable video POSTing on resume |
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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 - 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/
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