I followed the toturials from http://askubuntu.com/a/286775/251995 to install the AMD Catalyst drivers. Once I finished the "Install Drivers", I directly went to the "Test your Installation" section and the driver seems to work correctly, but both of these tests cannot work after restarting.
And if I followed the "Configuration" section, I would be prompted with an error saying something like low graphical mode when starts up, and need to reset display settings to default, but those two tests still does not work.
I cannot leave a comment in that post though, because I still does not have enough priviliges to do so.
Following is the error message I got when I say those two tests failed:
Using GLX_SGIX_pbuffer X Error of failed request: BadRequest (invalid request code or no such operation) Major opcode of failed request: 153 (GLX) Minor opcode of failed request: 19 (X_GLXQueryServerString) Serial number of failed request: 12 Current serial number in output stream: 12