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.
Isn't that what it's there for? In any context other than save/restore I wouldn't think using the BIOS was a good approach. But this is a special case, and if there's a BIOS function which does the right thing, it would seem to be easier to assume that the BIOS works than that the driver can do every operation for a clean restart.
The problem is that while POST leaves the video in a known state, it may not the known state you want, nor is it a given that you can get from there to where you were on suspend. PC hardware isn't always that dependable.
-- bill davidsen <[EMAIL PROTECTED]> CTO TMR Associates, Inc Doing interesting things with small computers since 1979 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
