Seems that problem is about xserver-xorg-intel package.
A workaround was proposed (By Nick Andrick) in this thread at launchpad bug
I've tested and worked for me with an HD 6770M hybrid with Intel HD 3000
Access THIS ppa link , click in xserver-xorg-video-intel - 2:2.20.0-0~andrik1 to expand and download xserver-xorg-video-intel deb file for your architecture (amd64 or x86), you must download the 2 following files:
where XXX must me your architecture identifier (x86 or amd64)
Then open terminal and go to directory where files were downloaded, then type:
after package installation, execute following command:
sudo dpkg -i xserver-xorg-video-intel*.deb
reboot your machine and install amd fglrx driver
sudo dpkg-reconfigure Xorg
TIP: I've installed 12.11 beta and first time I execute 'sudo amdconfig --initial -f' command it returns me that my graphic card is not supported. But I've rebooted, then I logged in Ubuntu (also without Unity bars)
But don't worry, wait about 1 minute until finish loading your OS, then press CTRL + ALT + T (to open terminal) and execute following commands:
Now everything works like a charm after rebooting...
sudo amdconfig --initial -f