i've been trying much the same thing, except using a high-end video
signal generator to pump what should be a valid test pattern into the
projector, and i've still had no luck. if i manage to pull it off,
i'll let you know how i did it.
rday
--
========================================================================
Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry:
Have classroom, will lecture.
http://crashcourse.ca Waterloo, Ontario, CANADA
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>
> Thanks for your mail -
>
> I made some progress: starting up my mac with two monitors, setting
> the second monitor to 640x480, 60Hz, then unplugging it and plugging
> in the pico worked stable once, but failed to repeat: the computer
> detects the change of monitor (unplugging it), does not recognize
> the pico and then sets the screen mode back to single screen. In the
> interim, the pico works, but just for a dozen seconds.
> I hope to solve with a little box I just ordered which simulates a
> DVI-D monitor, so the computer should always think there is a
> genuine monitor there. then the little box relays the DVI-D out, so
> should drive the Pico. ALternative option is a DVI-D splitter cable,
> which will have one real monitor (set to 640x480, 60Hz) on one, and
> the pico on the other connector. Have you tried these options?
as i mentioned in an earlier post, i used this video signal
generator:
http://www.quantumdata.com/products/882E.asp
to try to generate the appropriate test pattern signal to the pico.
from the docs, it appears that the pico wants
* VGA@60Hz
* Horizontal: 31.5kHz
* Pixclock: 27MHz
however, if i read the user's guide for that signal generator (long,
scroll all the way down to appendix D), if i restrict myself to the
predefined settings of progressive scan VGA, i can get this choice of
"480p#KA":
* V...@59.94Hz
* 31.469kHz
* 24.545454MHz
which i don't think is going to cut it. there's also, under VESA DMT
Formats, the choice of "DMT0660":
* VGA@60Hz
* 31.5kHz
* 25.2MHz
which also doesn't seem to work.
so if anyone can look at the format reference list for that
generator and make a recommendation, i'd love to hear it. when i next
get my hands on it, i think i can tweak the settings manually, but
what kind of latitude do i have in terms of getting "close"? is there
something else i am completely overlooking here? thanks.
> I hope to solve with a little box I just ordered which simulates a DVI-D
> monitor, so the computer should always think there is a genuine monitor
Which box? Do you have a link?
Robert
There's is no EDID in the pico.
Does the projector respond when you read the EDDID, this is an I2C read down the DDC lines in the DVI cable?