[Open-graphics] Video interrupt enable/disable

[Dieter]

> > > On high-end systems you may have a 1:1 mapping from device output to host
> > > input IRQ lines, so can determine an IRQ source without having to poll
> > > the individual devices.  However as a device designer/driver writer we
> > > can not assume this is the case.
> >
> > We should not presume that the card will be plugged into low end
> > hardware -- a cheep motherboard with AT style interrupt controllers.
> 
> Huh? So you're saying that we should produce a card that doesn't work on most 
> commodity PC hardware? Including the chipset you mention below?

The plan seems to be to dump the task of decoding video onto the CPU,
and most commodity PC hardware isn't nearly fast enough to decode HD
in real-time.  So the card isn't going to work until most commodity PC
hardware has a CPU faster than anything currently sold.  :-(