I think I've already seen that problem on a system with switchable graphics when using the discrete card.
I also remember that if I switched to Unity 2D from the login manager I was not able to reproduce the issue.
This is probably a problem in fglrx triggered by nux on some graphics chipsets.
I think I've already seen that problem on a system with switchable graphics when using the discrete card.
I also remember that if I switched to Unity 2D from the login manager I was not able to reproduce the issue.
This is probably a problem in fglrx triggered by nux on some graphics chipsets.