I  have  my  nv43 back  in  action -  and  unfortunately new  bugs  to report. 

When I compiled  new 3.7-rc  kernel  i  noticed   anything 3d  related, even 
trivial/tri  example from mesa/demos started  to  hang  my X server - usually 
I  was  able  to  switch  consoles  and reboot  clearly, but  not  always.
Strangely, _indirect_ rendering  worked  ok! kernels 3.4.6, 3.5.7, 3.6.x - all
OK.

will  add  kernel/X  log  after reboot into freshly  compiled  nouveau  kernel,
 now  I want to attach  partial  bisection  logs, done  with mainline  kernel.