spoke with gnome-shell developers, they motivated its not their fault but ati, and that the driver is closed source and they can not help with that. i fixed it by installing the radeon driver from xorg edgers ppa and all works fine.
https://launchpad.net/~xorg-edgers/+archive/ppa
i have an ATI Mobility Radeon HD 4550
spoke with gnome-shell developers, they motivated its not their fault but ati, and that the driver is closed source and they can not help with that. i fixed it by installing the radeon driver from xorg edgers ppa and all works fine.
https:/ /launchpad. net/~xorg- edgers/ +archive/ ppa
i have an ATI Mobility Radeon HD 4550