I'm not worried about getting the video controller to run at a given mode at
boot time. My concern is how to figure out what that mode should be. How do I
figure out what mode my old 20" Sun fixed frequency, sync on green, montor
connected via a hd15->13W3 converter should run at boot time. Monitors that
support DDC aren't a big problem, but ones that don't are very hard. Perhaps
in
the end, a user configurable default video mode should be available in
situations where the card simply cannot tell what to do.
--Patrick M
The best reference I know for this situation is Eric Raymond's Video Timings
HOWTO. That's what I used to calculate the modeline for my HP A1097C.
I had to order the HP data card to get the timing specs. There's probably
an on-line data base with timing specs for a wide assortment of monitors
nowadays. Certainly, anybody designing a production product with a special
display would be able to get the display's timing specs from the manufacturer.
A boot-time video mode that's configurable in the field should be
hardware-lockable, to permanently deny software and firmware any chance to
change it.
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