Comment 33 for bug 548709

(In reply to comment #14)
> Created an attachment (id=34715) [details]
> rv100_xorg_dmesg_vbios.tgz
>
> My video card has a single connector that looks to be a dual link DVI M1-DA.
> This image matches the pins on my adapter:
> http://en.wikipedia.org/wiki/File:M1-DA.svg
> I am using a cable that goes from that dual link above, to 2x VGA. I'm only
> using VGA #1 on this computer.

perfect. thanks!

>
> The output of radeontool regmatch DAC_MACRO_CNTL:
> DAC_MACRO_CNTL (0d04) 0x00000000 (0)
> (all the repetitive zeros that follow are excluded)

Does:
radeontool regset DAC_MACRO_CNTL 0x00000808
fix the issue?