xrandr 1.2 and ati 6.8: external DVI monitor stays blank

[Alex Deucher]

On Tue, Apr 15, 2008 at 10:13 AM, Frederik <freggy at gmail.com> wrote:
> I'm using an Apple Powerbook G4 with ATI Radeon graphics card and DVI
>  output on Debian Lenny/Sid. When I try to enable the DVI output with
>  xrandr, it seems like everything works from a software point of view (I
>  see in GNOME desktop applet that my desktop stretches to the new size),
>  but the external DVI monitor remains blank.

Many powerbooks use an external tmds chip to provide duallink on the
dvi port.  Not all of these tmds chips are currently supported as I'm
not sure which ones are used in which powerbooks.  It will work if you
boot up the laptop with the DVI port connected since OF will init the
tmds chip.

Alex