Re: [RFC] Reliable video POSTing on resume (was: Re: [ACPI] Samsung P35, S3, black screen (radeon))

Alan Cox
2005-02-06T16:02:34Z

On Sad, 2005-02-05 at 09:35, Pavel Machek wrote:
> Rumors say that notebooks no longer have video bios at C000h:0; rumors
> say that video BIOS on notebooks is simply integrated into main system
> BIOS. I personaly do not know if rumors are true, but PCs are ugly
> machines....
>

A small number of laptop systems are known to pull this trick. There are
other problems too - the video bios boot may make other assumptions
about access to PCI space, configuration, interrupts, timers etc.

Some systems (intel notably) appear to expect you to use the bios
save/restore video state not re-POST.