Re: 280.11: 100% CPU and hung gnome-session
I can confirm this as well (can't even login via gdm... I enter username & passwd and the screen just goes to the gdm background while xserver eats an entire core...)
275.09.07 work well for me.
280.13 & 285.03 have this issue.
What is more worrying is with this new "long-lived" driver program (ie 275.28) which is just suppose to have bugfixes has this EXACT same issue.
Thus one of these so call bugfixes has the regression