Originally posted by Radwulf:

A couple of other potential solutions:
http://gtm.steamproxy.vip/app/221410/discussions/6/846939854395110175/

Neither of these methods work for me. Games don't launch with either optirun or primusrun when doing the first and I'm getting constant black screen flickering with the second. Perhaps you guys can get it working?

"
1. Open /etc/environment in your favorite editor.
2. Add a new variable with a value of primusrun (e.g. OPTIMUS_PREFIX=”primusrun”) and save your changes.
3. Select a game - that you want to run using your discrete Nvidia card - from the Library page of the Steam client, right-click, and select Properties.
4. Click the SET LAUNCH OPTIONS... button and specify $OPTIMUS_PREFIX %command% for the command line.
5. Save your changes.
This method allows you to pick when the discrete NVidia GPU should be used on a per-game basis. Use of the OPTIMUS_PREFIX environment variable allows easy modification of the command in the future if changes happen in the underlying Bumblebee project.

The second method is not as efficient (in terms of power consumption) but quicker by running the Steam client and all games using Optimus. From the command line, enter primusrun steam instead of steam. This is inefficient because all games do not require the power of an NVidia card and power consumption is greatly increased during a Steam client/game session.
"

Oh ty, it worked to me :D

Bump

I need it with TF2 and Trine 2.
If I run TF2 without Steam overlay i cant join friends, and if I run Trine 2 without Steam i cant play online