Re: Subtle semantic issue with sleep callbacks in drivers

[Greg KH]

On Thu, Apr 17, 2003 at 04:47:45PM +0100, John Bradford wrote:
> > > > The video BIOS on a card often contains information that is found
> > > > -nowhere- else.  Not in the chip docs.  Not in a device driver.
> > > > Such information can and does vary from board-to-board, such as RAM
> > > > timings, while the chip remains unchanged.
> > > 
> > > Incidently, what happens if we:
> > > 
> > > * Suspend
> > > * Swap VGA card with another one
> > > * Restore
> > 
> > When it breaks, you get to keep both pieces.
> > 
> > That's a "Don't Do That" issue for any hardware between suspend
> > and resume.
> 
> Hmm, well what about with a PCI hotswap capable board - presumably
> then we could have the situation where a new VGA card appears that we
> _have_ to POST?

PCI Hotplug does not support video cards for just this reason.

greg k-h