Comment # 31 on bug 70388 from Linas Vepstas

Sergei, at the boot prompt (grub) I'm using vram_pushbuf=1 and NOT
nouveau.vram_pushbuf=1.  I have not tried using /etc/sysctl.conf although I
guess that should work, and I guess the entry nouveau.vram_pushbuf=1 might be
right.