I am also having this problem ("failed to copy vbios to system memory"),
and I tried all four kernel options recommended above.  It is worth
mention that I have a hybrid graphics system on my Sony Vaio Z series.

[code]
$ lspci|grep -i vga
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset 
Integrated Graphics Controller (rev 07)
01:00.0 VGA compatible controller: nVidia Corporation Unknown device 06e5 (rev 
a1)
[/code]

Note, in my xorg.conf, when I want to test the nvidia, I switch identifiers.  
The intel card seems to work fine.
[code]
Section "Device"
    #Identifier "Mobile Intel Graphics Media Accelerator 4500M HD"
    Identifier  "Configured Video Device"
    Driver      "intel"
    BusID       "PCI:0:2:0"
    #Option     "XAANoOffscreenPixmaps"
EndSection

Section "Device"
    Identifier  "NVIDIA GeForce 9300M GS"
    #Identifier "Configured Video Device"
    Driver      "nvidia"
    BusID       "PCI:1:0:0"
EndSection
[/code]

-- 
X fails to start with proprietary nvidia driver
https://bugs.launchpad.net/bugs/284715
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