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Using 2 GPUs

asked 2016-02-28 21:45:19 -0500

fafa gravatar image

After hours of trial and error, and googling for obscure, contradicting information I hope somebody can help...

I have ASUS R556L laptop with 2 GPUs: Intel and Nvidia 940M. On fresh Fedora install, system information tells me that Intel GPU is working. First question: how do I check if the other GPU is working with some apps? Should it work already with the open-source nouveau driver?

I decided I want the proprietary Nvidia driver, so I blacklisted nouveau, then downloaded and installed the right one from Nvidia site. After I installed it, all I got was black screen until I uninstalled. As I understand, the Nvidia GPU with that driver might be trying to work alone while only Intel GPU has access to the screen (?) How to solve this? Nvidia's manual isn't very helpful

Finally, I'm unsure whether or not my laptop supports Nvidia Optimus, as different guides propose different methods for checking that, giving different results. I tried installing Bumblebee, but I got black screen again (this time I couldn't fix by uninstalling, I had to reinstall Fedora). How to definitely check if I have Nvidia Optimus? If I do, do I need Bumblebee? How to install it properly?

I'd be grateful if somebody could shed some light on how my GPUs should be working together.

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That is a wall of text with a lot of questions but very short on details. What video cards and what have you tried? You need to try bumblebee. To some extent, the fact that it does not work answers your question, in my experience it is somewhat spotty, sometimes it works, sometimes not.

bodhi.zazen gravatar imagebodhi.zazen ( 2016-02-28 23:27:37 -0500 )edit

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answered 2016-02-29 13:20:22 -0500

fafa gravatar image

updated 2016-02-29 13:24:41 -0500

Thank you for comment bodhi.zazen. Looks like bumblebee worked after installing with instructions here:

I just had to substitute bbswitch-dkms for bbswitch, as stands here:

For some reason Bumblebee didn't work after installing with their own instructions. So if anyone reading this has similar problem, try the link above (first one), if that won't help, reinstall fedora then do that (that's what I did). Now I can run test app with GPU of my choice:

$ glxgears -info

(tells me I'm using Intel)

$ optirun glxgears -info

(tells me I'm using Nvidia)

I'm still having problems running all programs with Bumblebee but I guess that's beyond scope of this question. I just hope installing GPU drivers will get easier over time, as most users wouldn't be able to that, and fedora can't be a gaming system for average people as it stands now...

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Always best to start with the distro specific documentation first, then upstream, then "then internet"

bodhi.zazen gravatar imagebodhi.zazen ( 2016-02-29 13:30:50 -0500 )edit

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Asked: 2016-02-28 21:45:19 -0500

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Last updated: Feb 29 '16