So after I installed sabayon 8 on my computer, I had a problem with my video card driver. My screen would go pixelated momentarily and then go back to normal.
I found this thread and followed the guy's direction
"The open-source driver is called the Radeon driver. There are two open-source Radeon drivers: X.Org's xf86-video-ati driver which is not a kernel module (for installation instructions see the post Re: ATI Mobility Radeon X 1700 Драйверы! and take into account that the SL kernel version is different now to the one mentioned in that post), and the radeon kernel module (for installation instructions see Getting rid of Catalyst). In either case, you'll need to uninstall the closed-source FGLRX (ati-drivers package). Note also that you need to use (as root user) the command eselect opengl set xorg-x11. The command eselect opengl list should not show the asterisk against "ati", as that would mean the opengl libraries would be for the closed-source driver. Also, change Driver "fglrx" to Driver "ati" in /etc/X11/xorg.conf for the open-source driver."
The problem with pixelated screen is now fixed, but gnome went into fallback mode.
So I followed this guy's advice
"The easiest way of using the opensource driver without editing grub, etc. is to add a file called radeon.conf in the /etc/modprob.d directory as root. then edit radeon.conf and add this line without the quotes "options radeon modeset=1", then save and reboot. The ATI-userland (ATI Catalyst) drivers are not installed on a fresh install of Sabayon 7/8 anyway so no need to remove them, you will now have 3d and still retain the graphical boot.."
But then I didn't find the file radeon.conf. I created it and did what he said, but nothing changed.
I would like to get gnome 3 back.
My graphics card is Radeon hd 6770.