As Jens Janssen posted, installing the updated version of xserver-xorg-video-radeon (that's under xserver-xorg-video-ati) found on https://launchpad.net/~tormodvolden/+archive/ppa solved my problem.
Thank you Jens!
Package I've downloaded is this: https://launchpad.net/~tormodvolden/+archive/ppa/+files/xserver-xorg-video-radeon_6.12.2.99+git20090504.da58e351-0ubuntu0tormod_i386.deb
As Jens Janssen posted, installing the updated version of xserver- xorg-video- radeon (that's under xserver- xorg-video- ati) found on https:/ /launchpad. net/~tormodvold en/+archive/ ppa solved my problem.
Thank you Jens!
Package I've downloaded is this: https:/ /launchpad. net/~tormodvold en/+archive/ ppa/+files/ xserver- xorg-video- radeon_ 6.12.2. 99+git20090504. da58e351- 0ubuntu0tormod_ i386.deb