That was a quick response, thank you.
Seems that I have to wait again for a little (I hope it doesn't take too long ;) ) or try to fix the X crash without KMS.
EDIT: Tried again without KMS and it seems to work now (Arch has nice info on the WIKI regarding how to do it). :)
I seem to get cursor corruption when "ForceLowPowerMode" is enabled on my rv635 (HD3650), print screen seems not to store/save this corruption.
I'm on a Ubuntu 9.10 install with xorg-edgers ppa and latest mainline kernel 2.6.32-rc6.
Edit: Option "ExaNoDownloadFromScreen" "TRUE" fixes it
Latest news about the X.org.
26 May 2011: 6.14.2: Cayman (Radeon HD 6900) acceleration support, Fusion APU tiling fixes, other fixes [ changelog ]
17 Mar 2011: 6.14.1: Cayman (Radeon HD 6900) support (shadowfb, kms-only), big endian support [ changelog ]
3 Feb 2011: 6.14.0: KMS EXA/Xv support for Evergreen GPUs (Radeon HD 5000 series), Fusion APUs (Ontario series) and Northern Islands GPUs (Radeon HD 6000 series but not 6900), KMS pageflipping support for all radeons [ changelog ]
6 Jul 2010: 6.13.1: server 1.9 support, evergreen accel disabled explicitly, kms uevent + sync support, rn50 fixes, enable color tiling on kms on r300->r500. xv cleanup and large vertex number fixes. [ changelog ]
Latest changes in the development tree can be seen at: http://cgit.freedesktop.org/xorg/driver/xf86-video-ati/