This was my conclusion as well and in my old post I provided links to
some wiring schematics to make a VGA terminator. All the places I could
find which sold VGA terminators seem to no longer have them in stock.
The sense pins indicate what resolution the connected display is running
and my assumption was that with nothing connected the Mac polls
continually for that information but never gets it. It's hard to tell
whether this happens at a hardware level or some other API call which
fails to return quickly because it is waiting on the sense pin results
which never come.
CB
On 11/26/12 11:54 AM, - wrote:
It is interesting that a monitor without power previntes the mac
system slowdown. This sounds as though the mac does a form of a ping
to query from time to time what is attached. If it doesn't recieve a
return signal instantly it does it again and/or waits for a determined
time before allowing an application to resume activity.
If this is the case, any return signal is not being generated by the
monitor but the circuit is made at the socket and passes it back to
the mac. It would then in principle be possible to find the wire pairs
in the vga socket and make the return circuit absent a monitor.
XB
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