Comment # 72 on bug 70354 from Ilia Mirkin

(In reply to Richard from comment #71)
> Aww... got my hopes up :( No dice with 'nouveau.config=War00C800_0=1' on
> this setup:
> 
> [    1.865840] fb: switching to nouveaufb from simple
> [    1.866421] nouveau  [  DEVICE][0000:01:00.0] BOOT0  : 0x0e70d0a2

You need a kernel that supports this workaround... 4.3-rcN should do.