Minor correction, for geeks who care about technical trivia. I
> I don't think [VGA] Modeline timings have any meaning when
> generating a true digital display signal...
Apparently the modeline timings do still have significance in terms of
digital information transport, which mimicks analog signal timing, but
there is no hard and fast correlation between data transport and what
actually happens on the screen at any moment in time. A digital display
can in principle update whatever it wants, whenever it wants, once the
information has arrived.