I'm running 14.04 on an ASUS UX303UB which features that ever so troublesome dual GPU thingy, with 'Sky Lake Integrated Graphics' for discrete graphics and 'GM108M [GeForce 940M]' for performance graphics.
I've had a very similar laptop, UX303LN, which featured the very same graphics setup but it used a Intel Broadwell architecture where this new one features a Sky Lake architecture.
Having read a bit on the subject, it seems these new architecture wasn't supported before linux 4.3, and was now improved on 4.4.
I'm now running the latest possible kernel (Linux ux303 4.4.4-040404-generic #201603031931 SMP Fri Mar 4 00:34:16 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux), and installed the latest nvidia graphics 352 (tried both the 352 and 352-updates).
But nvidia-prime won't list any of the GPUs, I know I'm stuck on the Intel discrete GPU (because of performance). Running
prime-select query simply returns
prime-select nvidia gives me:
Error: alternatives are not set up properly Error: nvidia mode can't be enabled
I am completly stuck on this, have tried a number of different things (so many I can't remember which), I was really hoping the 4.4 kernel would get this to work, but no luck. I was using 3.19 kernel before, and I could see the GPUs on nvidia-prime (just couldn't select the NVIDIA card).
Any help, ideas, comments, or more information you can give, or require, please feel free.