Can you enable the hardy-proposed and hardy-updates repositories, install EnvyNG so as to install the latest release of the driver?
If it doesn't solve the problem, try to disable the desktop effects (Compiz).
Can you enable the hardy-proposed and hardy-updates repositories, install EnvyNG so as to install the latest release of the driver?
If it doesn't solve the problem, try to disable the desktop effects (Compiz).