Bug#481361: xserver-xorg-video-ati: No display on DVI output

[Alex Deucher]

On Tue, Dec 16, 2008 at 11:43 AM, Francois Gouget <fgouget at free.fr> wrote:
> On Mon, 15 Dec 2008, Alex Deucher wrote:
> [...]
>> Thanks for tracking this down.  Unforunately, the code has changed
>> significantly since then and it's not clear to me how that would have
>> affected your card.  Any chance you could send me some reg dumps
>> between a working system and the non-working system?
>
> Sure. There you go:
>
>  * working.dump
>   This was taken with the last good driver.
>   What is interesting is that doing the dump killed the DVI output...
>   but not the X driver. So I was able to connect to it using x11vnc.
>
>  * working-after.dump
>   This is what I got when I ran radeontool again, right after the first
>   run killed the DVI output.
>
>  * broken.dump
>   This one was done after a reboot with the latest driver I tested:
>   89a8fd53.
>

start up X with the broken code and try this:
./radeontool regset FP_GEN_CNTL 0x0a430085

That should bring the display up.

Alex