Bumblebee in Ubuntu 15.04 (Optirun/Primus) Error

Question

I recently upgraded to 15.04 and after successful installation I noticed that Bumblebee has stopped working. Optirun/primus commands do not detect the gpu anymore (640M LE). Here's what I get when trying to run Steam:

$ primusrun steam
Running Steam on ubuntu 15.04 64-bit
STEAM_RUNTIME is enabled automatically
Installing breakpad exception handler for appid(steam)/version(1428965940)
primus: fatal: Bumblebee daemon reported: error: Could not load GPU driver

[2015-04-25 18:25:59] Startup - updater built Apr 13 2015 15:17:10
[2015-04-25 18:25:59] Opted in to client beta 'publicbeta' via beta file
You are in the 'publicbeta' client beta.

My driver is nvidia-346-updates.

Configuration files are default. Should I change my kernel driver and library path? (Right now they are nvidia-current).

Solution 1

I got it working like that on Kubuntu 15.04 with 340.76:

Driver=nvidia
...
[driver-nvidia]
KernelDriver=nvidia_340
PMMethod=auto
LibraryPath=/usr/lib/nvidia-340:/usr/lib32/nvidia-340:
XorgModulePath=/usr/lib/nvidia-340/xorg,/usr/lib/xorg/modules
XorgConfFile=/etc/bumblebee/xorg.conf.nvidia

Solution 2

What does "optirun --verbose glxgears" return ?

Edit : I had to change KernelDriver to fit the proper name of the module (I use nvidia-349 so I had to put nvidia-349 instead of nvidia).
Once I dit it, I had to update the XorgModulePath to fit the proper paths to the libraries according to the version of your driver. For me it is :

/usr/lib/nvidia-349/xorg,/usr/lib/xorg/modules

PS : Thanks to A.B. for his comment

Comments

[Newbie]

$ optirun --verbose glxgears [ 5279.938213] [INFO]Response: No - error: Could not load GPU driver [ 5279.938230] [ERROR]Cannot access secondary GPU - error: Could not load GPU driver [ 5279.938240] [ERROR]Aborting because fallback start is disabled.

[regar42]

Could you post your bumblebee.conf ?