A rough overview of using Nvidia Optimus on %%FreeBSD%%.

===== New approach (as of 2018.03.11) =====

Run [[https://www.freshports.org/x11/virtualgl/|x11/virtualgl]] from ports and the rest should work.

===== Old approach =====

:!: as of 20180715, gcc47 has been removed.  The following will no longer work.

Initial port/PR: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=192617

  * Make sure Nvidia Optimus is enabled in BIOS.
  * Install graphics/libjpeg-turbo and lang/gcc47. Make sure to tick the PIC option on ''%%make config%%'' for libjpeg-turbo.
  * Now download %%VirtualGL%% and build it. 
    * Comment: Fairly simple, CMake based. You might need to tweak a single file or two to account for a certain function being defined elsewhere on %%FreeBSD%%, I forgot. Also, set ''%%CC=gcc47%%'' and ''%%CXX=g++47%%'' beforehand. 

  * Now, install x11/nvidia-driver. Be warned that when you next update graphics/libGL, it will try to create a symlink from the Nvidia libGL.so in ''%%%LOCALBASE%/lib/.nvidia%%'' to ''%%%LOCALBASE%/lib/libGL.so%%''! Don't let it do that. 

  * Now you must configure a ''%%/etc/X11/xorg.conf.nv%%''. Mine looks a little like this:

<code>
Section "ServerLayout"
    Identifier "Layout0"
    Option "AutoAddDevices" "false"
    InputDevice "fake" "CorePointer"
EndSection
Section "Device"
    Identifier "Device1"
    Driver "nvidia"
    VendorName "NVIDIA Corporation"
    BusID "PCI:01:00:0"
    Option "NoLogo" "true"
    Option "UseEDID" "false"
    Option "ConnectedMonitor" "DFP"
EndSection

Section "InputDevice"
	Identifier "fake"
	Driver ""
EndSection
</code>

  * Modify xmj's ''%%turn_off_nvidia.sh%%'' replacing all _OFF/DOFF/SDOF and so on to read ON instead. Execute it. Now ''%%kldload nvidia%%''

  * We can test this now. Run ''%%X -conf xorg.conf.nv -sharevts -noreset :8%%'' in bg.  
  * Now run ''%%/opt/VirtualGL/bin/vglrun -ld /usr/local/lib/.nvidia/ -d ":8" glxgears%%''
  * Did it work? Congratulations!

  * And to turn off Nvidia, simply end the running X server on the Nvidia card, ''%%kldunload nvidia%%'', and execute ''%%turn_off_nvidia.sh%%''.

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{{tag>HowTo}}