DVI output not visible on LCD with DVI, VGA output works -- (MergedFB on Ubuntu Edgy, Powerbook G4 ATI radeon 9600 M10)

Martin Langhoff martin.langhoff at gmail.com
Sun Jan 14 00:20:49 PST 2007

On 1/13/07, Alex Deucher <alexdeucher at gmail.com> wrote:
> Barring a connector table we make some guesses in the driver.  Also,
> ati apple cards tend to wire up the DDC lines differently or provide
> DDC for LVDS.

Thanks for the hints. One of the weird things I found on friday is
that if I get x.org started with my work LCD over DVI, and then head
home and wake the laptop up with the home LCD... DVI just works.

A couple of X.org restarts later, the home LCD doesn't read the DVI
signal any more.

Now that I've seen that, I'll capture the logs and registers next time
I do it, and diff them.

> reduced blanking may help. You might also experiment with some
> slightly tweaked modelines.

Reduced blanking is on... and yes, I think I'm going down the path of modelines.


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