Hamish Marson wrote:
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James Richard Tyrer wrote:
Jon Smirl wrote:
On Sat, 26 Aug 2006 20:43:57 +0100, Dieter wrote:
Why does DDC need to work if the monitor is powered off?
So that if you turn the computer on before the monitor the video
card will
be outputing the right mode when you turn the monitor on.
I always suggest working on modesetting code with an LCD panel so
that you
don't destroy your CRT monitor. I don't believe it is possible to
destroy
the LCD panels.
Probably only get an LCD very confused. You don't want to turn on a
CRT till you have the correct frequencies set.
I have an ultra-cheap (Goodmans) LCD panel, 15" 1024x768 monitor. It
displays (With a suitable popup for about a second) everything thrown
at it via the analog 'VGA' output of my video card. Including
1680x1050 output mirrored from my main DVI connected monitor (When X
runs in clone mode).
So yeah, I'd say based on that demonstration that it'd be kinda hard
to break an LCD monitor by giving it 'bad' signals... (Although I've
never broken a CRT feeding it bad signals either. The best I ever got
was having it refuse to display a picture).
New ones are smart enough to just shut down if the PLLs don't lock on
the sync signals. However old monitors (specifically the one that comes
with the original IBM PC) will self destruct if given the wrong sync
frequencies.
Mind you we have spent an awful long time trying to solve a problem
that probably exists in 10 places around the world (i.e.g can't
beg/borror/steal a VGA monitor to bootstrap the card if you want some
strange fixed-freq support). [Not that I'm saying don't support it if
it's easy enough, but it does seem like an awful lot of time spent
discussing & arguing about it].
Yes, I agree. Borrow a VGA monitor or use a TV are perfectly reasonable
solutions to the problem.
--
JRT
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