I installed debian/lenny yesterday on my 780G test system.
For installation i use the "expert" modus. I downsized the wxp partition to 250GB and created a 4GB swap partinion and a 246GB system partition.
During installation I only installed the basic system without desktop stuff.
Lenny uses grub2 now, did not know there is a second version available. Seems to be able to use higher resolution graphic modes.
After the installation finished i used aptitude to install "Desktop" and "Gnome-Desktop" stuff. Took ~6min's to get all the packaes from the net over my 16GBit connection.

(Had used a 3GBit connection last time so i was impressed).
"Desktop" and "Gnome Desktop" meta packages do not include xdm or gdm, which is a good thing if the card does not work out of the box.
I installed the fglrx packages and module-assistant.
I started module-assistant, made and installed a fglrx-kernel package. Afterwards I simply replaced "vesa" with "fglrx" in the Display section of /etc/X11/xorg.conf.
I started X and fgl_gears (or so) worked and looked accelerated in terms of speed.
All that took aprx. 30minutes.
Then I installed the compiz stuff with synaptic package manager.
My current Desktop system for some strange reason did not boot my lenny install (had it installed on the M3A and moved it to the M2A-VM).
I moved that systems hd to my 780G setup and tried to customize xorg.conf.
In short it did not work and I went tru dozends for forums and tried all types of modifications without luck.
I booted my other desktop's system which succesfully ran compiz on the M3A (not sure if i had used the hd2600xt or the hd2400pro that time).
compiz did not work here also. I also had beryl/emmerald installed on that system before. I was able to start berly but the emerald window decorators did not show up (guess some stuff got overwritten from compiz/compiz-fusion). However if I opened or closed windows i saw 3d-effects.
Will try to sole the problem more systematic later (after at least 8 hrs of office work) today, all above testings where AIGLX related, i have not tried XGL yet.
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