[Bug 10418] Powerbook DVI out only works when booted with monitor attached

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=10418





------- Comment #28 from agd5f at yahoo.com  2007-10-03 11:59 PST -------
(In reply to comment #26)
> 
> yes, it's with that option... will do asap; in the mean-time I played around
> looking at the i2c accessible registers (I really wish I had a data-sheet for
> the TDMS) and found out the following:

most of the sil ones are available, although, you'd have to open up your laptop
to figure out which one you had unless OSX tells you somewhere.

> 
> the columns 'setup' shows the values after booting up with DVI attached and the
> TDMS properly setup (i.e. working DVI output) by open firmware; whereas the
> 'reset' column shows the registers after powering up without any DVI monitor
> attached (or alternatively what they look like after waking up the powerbook
> from standby);
> 
> since fiddling with 0x8/0x9/0xa/0xc alone doesn't seem to be enough, I tried
> replicating all seven registers which finally got me a picture with the right
> resolution on DVI, alas with completely wrong colors, as if the data bitstream
> coming out the DVI port is slightly off and thus causes rgb-values to be messed
> up... :-(

You probably either have a different TMDS chip in your laptop that needs an
alternate setup, or the chip needs different set up for single vs. dual link
mode.  What size panel are you using?  Regarding the color issues, you probably
need to tweak FP2_GEN_CNTL.  you might want to dump that reg before starting X
to see what the firmware sets it too.  Also there is some commented out code in
RADEONInitFP2Registers() that you probably need to enable for things to work
properly on your chip.


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