--- Comment #4 from Arno Schuring <aelschuring@...> 2009-08-07 10:54:46 PST ---
In order to rule out any incompatibilities between Debian and Ubuntu, I tried
the Ubuntu karmic live-cd (alpha-3) today. The shipped kernel (based on -rc3)
supports kms when radeon.modeset=1 is passed on the command line.
This cd exhibited the same symptoms at boot (one monitor killed), but X.org
could succesfully initialize the second monitor, using a 6.12.99 driver from
Next, I installed the packages from xorg-edgers in the live environment, and
the symptoms reappeared. I have tried various combinations of mesa, libdrm, and
xorg-video. I apologize for not having exact version numbers - I did create a
document containing all my findings but being a live-cd, I stored it only on
the tmpfs and during one of my trials I got a hard hang...
Nevertheless, I can confidently say the following:
- the display problems are consistent among all tested kernels (self-built -rc1
to -rc5, and Ubuntu-built -rc3)
- X.org is capable of recovering the second monitor itself, except when using
all packages from the xorg-edgers repository. I scanned the build logs for both
libdrm and video-ati, and the only difference between the builds (other than
checkout dates) is the appearance of enable-radeon-experimental-api in the
xorg-edgers libdrm. I assume all other configurations use an older code path
- in all cases where X.org failed to recover the second monitor, xrandr showed
incomplete resolution information like I mentioned above.
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