I'm using a Quantal AMDx64 install and a XFX Radeon HD5850 video card. I first enabled restricted drivers through additional drivers, but it resulted in breaking Unity and Compiz (I can only see my wallpaper and shortcuts. But the terminal still works and Nautilus too, however, without Close/Maximize/Minimize and slower). Then I uninstalled it and everything went back to normal. Then I installed it via terminal (12.10 version), and the result was the same. Then I downloaded it via ATI's web site (12.11 beta) and installed the .run file using the terminal, but the result was yet again the same. Then I went to the terminal and entered these commands:
aticonfig --help used the command it said it should be used to set the card for the first time aticonfig --initial compiz --replace - It gave me a driver error, the OpenGL doesn't work unity - Same thing
And I also got the "AMD Testing Only" watermark.
Side notes: My Ubuntu is installed on a ext4 partition with 60GB, and I dual boot with Windows 7 (at least for now). My internet is a 50kbps 3G-ish, so downloading even small files is a pain, let alone a video driver. I would rather not reinstall the O.S., it was a herculean task to download everything I had in there, and I have very little free disk space for backups. I'm still new to Ubuntu (I know some basic commands), and I don't know how to debug, so please, be patient XD.
Thanks in advance. If you need any info, just ask (and explain how to get it XD).
UPDATE I just installed the restricted-updates driver too, but the result was the same. Now I found the Xorg.2.log, but the site doesn't let me post it here, so I'll have to ask me to look for specific parts of it.