[lkml]   [2005]   [Feb]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC] Reliable video POSTing on resume
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)
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
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 14:10    [W:0.177 / U:2.408 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site