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I just upgraded to Ubuntu 15.10 and switched from Bumblebee to Nvidia Prime. I'm currently using the 355.11 driver from https://launchpad.net/~graphics-drivers/+archive/ubuntu/ppa, but the problem also occurs when using the drivers in the official Ubuntu repo.

Prime works as expected, apart from the fact that I need to reboot in order for it to switch cards. If I logout and try to login again after switching, it just keeps showing me the login screen after I type in my password. This happens regardless of whether I switch from Nvidia to Intel or from Intel to NVidia.

Here's my /var/log/Xorg.0.log after I switch from Nvidia to Intel and try to login: http://termbin.com/n75a

When I go to TTY1 and do "prime-select nvidia" (the driver that was loaded during boot), I can login again at TTY7.

This question seems similar to ubuntu 14.04 - nvidia prime only works on restart (logout-login doesnt work), but the only answer there is to install Bumblebee...

Does anyone have an idea on how to solve this?

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Why did you switch from bumblebee to PRIME???!!!! Is there a serious reason? For me PRIME gives me nothing but problems, screen tearing all over the place and no Vsync in games!!!

I strongly recommend you switch to bumblebee with the nvidia-355, works like a charm for me and many others!!

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  • Because when my Bumblebee configuration crashed after upgrading from nvidia-346 to 352 and I went looking for a solution, I got the idea that Bumblebee was or would be discontinued. In fact, someone on IRC literatlly told me this. I also read a lot of conflicting messages regarding performance in Bumblebee vs Prime. Not that I didn't try. I can't even remember how often I've uninstalled and reinstalled nouveua, nvidia-340, -352, or -355 with Prime or Bumblebee. Nothing worked, until I got to 355 + Prime. I'm hesitant to try Bumblebee again because I finally have a working solution... – lackodan Oct 31 '15 at 20:45
  • Well you may try to follow the instructions in the answer, there is a very high chance you didn't do all of these?! Just change nvidia-352 to 355! askubuntu.com/questions/689724/… – philsegeler Oct 31 '15 at 22:14
  • Also bumblebee is not discontinued at all!! It is the REAL optimus support for linux and still gets bugfixes and maintenance! github.com/Bumblebee-Project/Bumblebee/issues – philsegeler Oct 31 '15 at 22:16
  • Or maybe -just maybe- the same Linux drivers/software don't work equally well on every hardware configuration. Imagine that. I did in fact follow the instructions in that answer for Bumblebee + nvidia-340 and nvidia-352, those being the only drivers in the official repos. Did not work. The only time I ever got Bumblebee to work was with the ppa-edgers nvidia-346 drivers, before I upgraded to 15.10. I'm happy to hear Bumblebee works great for you, but I'll wait for a bit for some input from other people before I try messing around with it again. – lackodan Oct 31 '15 at 23:00
  • OK, fine, i was just trying to be helpful. Good Luck! – philsegeler Oct 31 '15 at 23:20

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