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

[Francois Gouget]

On Fri, 16 May 2008, Alex Deucher wrote:
[...]
> The following options may also
> help: Option "DefaultTMDSPLL" "TRUE" Option "DisplayPriority" "HIGH"

I had already had "DefaultTMDSPLL" set to "yes". I set it to "TRUE" just 
to make sure but it did not make a difference.

I tried setting "DisplayPriority" to "HIGH" in addition to the above but 
again no difference.


> If that doesn't help, try a modeline with a reduced refresh rate (50
> hz rather than 60):
> Modeline "1920x1200_50.00_rb"  127.75  1920 1968 2000 2080  1200 1203
> 1209 1229  +HSync -Vsync

I tried this one by modifying my Monitor section as follows:

Section "Monitor"
        Identifier      "IIyama"
        Option          "PreferredMode" "1920x1200_50.00_rb"
        ModeLine        "1920x1200_50.00_rb"  127.75  1920 1968 2000 2080  1200 1203 1209 1229  +HSync -Vsync
EndSection

Unfortunately there was no change. I did see that 1920x1200_50.00_rb was 
the preferred mode in the Xorg.0.log file, however I found no other 
indication of the actual selected refresh rate in that file. However I 
also tried "PreferredMode" "1024x768" and then it's clear that it's 
taken into account, and even if I'm still not sure of the refresh rate 
it's very unlikely to be so high that either the card or the monitor 
cannot handle this low resolution.


> if none of that helps can you try the attached patches and let me know
> which, if any, help?

The patches test different combinations of RADEON_PLL_DCE3 and 
RADEON_PLL_USE_REF_DIV.

RADEON_PLL_DCE3 is not known in the 6.8.0 codebase. So I tried the 
patches in the 6.8.1~git20080512.94bf8f01 codebase.
 * pllboth.diff corresponds to the existing code of the 6.8.1 codebase.
   Unfortunately that version of the driver does not work either.

 * Then I reverted pllboth.diff and applied plldce3.diff and installed 
   the resulting driver. Unfortunately there was no change either.

 * Finally I reverted plldce3.diff and applied pllrefdiv.diff but again 
   there was no change.


-- 
Francois Gouget <fgouget at free.fr>              http://fgouget.free.fr/
 Advice is what we ask for when we already know the answer but wish we didn't
                                 -- Eric Jong