[Nouveau] Help needed for bug 58556

[pierre.morrow at free.fr]

Hello, 

One thing that differs between the NV96 and the NVAC, is the efifb handling: 
for the NVAC, efifb is conflicting with nouveaufb, therefore it is removed, 
whereas the NV96 has no problem and keeps efifb along. 

To sum up what happens with the different framebuffers on the two cards: 

NVAC: with efifb+nouveaufb: corruption, with nouveaufb: still corrupted 
NV96: with efifb+nouveaufb: ok, with nouveaufb: screen freezes 

So NV96 does not seem to use nouveaufb for outputing, as removing efifb 
freezes the screen (ie. the machine continues to run, just the screen isn’t 
updated anymore) and removing nouveau_fbcon_init has no effect. Not sure why 
NV96 does not use nouveaufb... 
And NVAC uses nouveaufb (removing efifb has no effect and removing 
nouveau_fbcon_init causes a screen freeze). I need to do some further tests 
as removing nouveau_fbcon_init and nouveau_accel_init does not seem to bring 
garbage screen before freezing. 

Pierre
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