Created attachment 32136 [details]
Log of the crash
From the console of a machine equipped of two ATI 4850 (RV770) linked in CrossfireX loading the radeon kernel module with modeset=1 results in a crash (see attached log) and a black screen. Disabling KMS makes the the radeon kernel module being loaded without any issues.
When the screen turns black, the LED of my monitor does not blink so a signal seems to be detected by the monitor (digital connection).
If I can be of any help, please just mention what I should do to provide more details/traces/etc.
Tested again with the 2.6.33-rc4 : this time the screen becomes blank and the LED on the front panel blinks indicating no valid signal. See attached log.
03:00.0 VGA compatible controller: ATI Technologies Inc RV770 [Radeon HD 4850]
03:00.1 Audio device: ATI Technologies Inc HD48x0 audio
04:00.0 VGA compatible controller: ATI Technologies Inc RV770 [Radeon HD 4850]
04:00.1 Audio device: ATI Technologies Inc HD48x0 audio
Created attachment 32660 [details]
FYI, the first bug description and the "Log of crash" attachment were made for linux 2.6.32. I renamed the bug description as it happens under Linux 2.6.33 too.
Same troubles noted under 2.6.33 and 2.6.34.
Trouble gone away in 2.6.35 ! Unfortunately I face to some other issues...