I suggest partially removing the nouveau graphics drivers from Debian alltogether.
I understand this will generate debate, but the driver has serious issues everywhere. I have tried 3 different configurations with debian and nvidia graphics cards in the past days. A relatively new, a relatively old, an a really old. (The test hardware is fine, it work well with Windows.)
Test hardware 1: Integrated GeForce 7025 with Ascork N68 AM3 motherboard
Result: Computer crash every time you maximize a window with video acceleration (such as video playback or opengl).
Test hardware 2: GeForce 6100 in Asrock ALiveNF6G
Result: Computer crash with firefox or chromium. Video corruption in chromium even after disabling video acceleration.
Test hardware 3: Old AGP based motherboard with GeForce4 MX440
Result: Computer crash with firefox after a minute.
I understand that a few 1000 people maybe want to play some opengl based games, but there is 6 billion people who just want to use their computer without causing a system crash when he wants to watch a video.
(btw, cirrus logic and sis drivers are totally broken as well, x11 crashes with those cards at boot)
The solution could be keeping nouveau's 2d driver so the gui will stay fluid, however, everything that has anything to do with video acceleration, must be eradicated from the operating system to protect system security and realibility, and opengl should be supplied with llvmpipe instead.