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How to debug video driver?

 

ive found lsmod gives active video driver in
ttm                    56601  1 nouveau
drm_kms_helper         30136  1 nouveau
8139too                19581  0
via_agp                 5322  1
drm                   167928  4 nouveau,ttm,drm_kms_helper
8139cp                 16934  0
floppy                 54183  0
pata_via                7300  4
agpgart                32011  3 ttm,via_agp,drm
i2c_algo_bit            5168  1 nouveau

is that correct? so to make dbg output i need to install
xserver-xorg-video-nouveau-dbg ?
and next i can use in terminal
gdb -p $(pidof X) -batch -ex 'handle all nostop' -ex 'handle all pass'
-ex 'handle 11 stop' -ex 'cont' -ex 'bt full' -ex 'cont' >
/opt/xservercrash.txt 2>&1
?? yes? that will help generate dbg when crash occours?
crash im having is on 10.10 xubuntu clean install FF opening
http://en.wikipedia.org/wiki/Ubuntu_(operating_system)#cite_note-11
freeze Screen but mouse still moves and sound still comes nothing
reacts and minutes:seconds doesnt move.
But i can at least restart in Raw mode opening TTY6 (but screen doesnt
changes and mouse still moves) and then ctrl+alt+del