Comment 32 for bug 1159707

I confirm same issue using Ubuntu on Lenovo z40, details above:

$ lsb_release -a
Description: Ubuntu 15.10
Release: 15.10
Codename: wily

$ cinnamon --version
Cinnamon 2.8.6 (last cinnamon version)

$ uname -a (Last kernel version)
Linux z40pc 4.4.1-040401-generic #201601311534 SMP Sun Jan 31 20:36:43 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$lspci
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09)
03:00.0 3D controller: NVIDIA Corporation GF117M [GeForce 610M/710M/810M/820M / GT 620M/625M/630M/720M] (rev ff) (Inactive using nvidia prime control, using only Intel graphics instead)

Ubuntu drivers installed
nvidia-352 352.63-0ubuntu0 amd64 NVIDIA binary driver - version 352.63
nvidia-prime 0.8.1 amd64 Tools to enable NVIDIA's Prime

workaround

reboot, kill cinnamon pid or X session
use docky to launch apps

I hope that can be solve.

Thank you

Alex