At the time dual-head features were added, there was no OEM VE card
available. The dual-head support in x420 radeon driver hasn't been tested on
any OEM card. It turns out DELL has some cards with OEM version of BIOS not
working with current driver on their 2nd head.
AFAIK, DELL has cards with two DVI-D outputs and with two VGA outputs (all
from a dangle). It appears if the 2nd head is connected to a CRT, some
register bit (CRT2_ON?) has not been set correctly and you'll get a blank
screen. If the 2nd head is connected to a DFP, it's totally not handled. I'm
not sure when someone (or myself) can have time to have this support added.
Not sure what kind of card you have, maybe you can help to debug it :-)

>
> Can you explain this a little more further ?
>
> Do you mean that the OEM chip isn't supported by the XFree driver ?
>
> I did some test on DELL's OEM Radeon VE card with a 4.2.0 XFree86, and
> both cards get initialized, but 2nd screen remain with no signal.
>
>
> Stephane
>
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