I found a working combination:
nvidia-331 nvidia-settings-updates from xorg-edgers
ubuntu-drivers-common:1:0.2.98.4 from packages.ubuntu.com (utopic!)
kernel:
3.13.0-37-generic
dpkg -l | grep nvidia:
ii nvidia-331
331.89-0ubuntu1~xedgers14.04.2 amd64 NVIDIA
binary driver - version 331.89
ii nvidia-libopencl1-331
331.89-0ubuntu1~xedgers14.04.2 amd64 NVIDIA
OpenCL Driver and ICD Loader library
ii nvidia-opencl-icd-331
331.89-0ubuntu1~xedgers14.04.2 amd64 NVIDIA
OpenCL ICD
ii nvidia-prime 0.6.2
amd64 Tools to enable NVIDIA's Prime
ii nvidia-settings
343.13-0ubuntu1~xedgers14.04.1 amd64 Tool for
configuring the NVIDIA graphics driver
ii nvidia-settings-updates
343.13-0ubuntu1~xedgers14.04.1 amd64
Transitional package for nvidia-settings
** Changed in: xorg (Ubuntu)
Status: New => Fix Committed
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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1382055
Title:
Trusty/HybridGraphics: nvidia not detected, prime-switch segfaulting
since introduced.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1382055/+subscriptions
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