Anne Wilson wrote:
I was reluctant to state this because I have no authoritative knowledge
on these things but if you change video cables, I think that you need to
reboot to get the video chipset to properly recognize the cable/monitor
connected.
I'm pretty sure you do. I had done that, though.
on VGA, yes, the video controller can only read the "VESA ID" extended
format information when its reset, its a horrible mess of a kludge
interface as IBM had only alloted like 3 pins for a 1-of-8 model monitor
specification back in 1984 or whenever the first VGA was designed.
VESA created this very complex dance where the V sync line is used to
clock serial data over those pins, and its only read when the monitor
sync is stopped for some length of time, then started, the video
controllers capture this data and save it so the host can later read
it. I forget all the specifics, I had to work with this stuff in the
mid 1990s when it was devised.
I /think/ on DVI its a lot better, but I've not actually worked with
that at a low level so I can't confirm this from direct experience.
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