When I installed on mac-mini I followed a “hint” I found. I wrote it down and that was lucky because I could not find it when I was looking for it just now.
Here it comes:
sudo lshw -businfo -class bridge -class display
Bus info Enhet Klass Beskrivning
pci@0000:00:00.0 bridge MCP89 HOST Bridge
pci@0000:00:03.0 bridge MCP89 LPC Bridge
pci@0000:00:0e.0 bridge NVIDIA Corporation
pci@0000:01:00.0 bridge XIO2213A/B/XIO2221 PCI Express to P
pci@0000:00:15.0 bridge NVIDIA Corporation
pci@0000:00:16.0 bridge NVIDIA Corporation
()pci@0000:00:17.0 bridge MCP89 PCI Express Bridge
()pci@0000:04:00.0 display MCP89 [GeForce 320M]
sudo nano /etc/grub.d/01_enable_vga.conf
cat << EOF
setpci -s “00:17.0” 3e.b=8
setpci -s “04:00.0” 04.b=7
~$ sudo chmod 755 /etc/grub.d/01_enable_vga.conf
~$ sudo update-grub
~$ sudo setpci -s “00:17.0” 3e.b
~$ sudo setpci -s “04:00.0” 04.b
I didnt work the first 2-3 times I installed but then it worked!
Hope this can help!!