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

Pavel Machek
2005-02-05T09:35:50Z

Hi!

> > We already try to do that, but it hangs on 70% of machines. See
> > Documentation/power/video.txt.
>
> We know that all of these ROMs are run at power on so they have to
> work. This implies that there must be something wrong with the
> environment the ROM are being run in. Video ROMs make calls into the
> INT vectors of the system BIOS. If these haven't been set up yet
> running the VBIOS is sure to hang. Has someone with ROM source and
> the appropriate debugging tools tried to debug one of these hangs?
> Alternatively code could be added to wakeup.S to try and set these up
> or dump the ones that are there and see if they are sane.

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....
Pavel
--
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