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In nvidia-settings chosen "Intel(Power Saving Mode)". Output of sudo prime-select intel is:

Info: the current alternatives in use are: ['nvidia-358-prime', 'nvidia-358-prime']
Info: the intel profile is already in use

But output from sudo cat /proc/acpi/bbswitch is

0000:01:00.0 ON

Ubuntu 15.10 x64, nvidia-358 from ppa:graphics-drivers/ppa.

0

Okay, I switched back to nvidia-355, problem solved.

  • Welcome to Ask Ubuntu! I recommend editing this answer to expand it with specific details about how to do this. (See also How do I write a good answer? for general advice about what sorts of answers are considered most valuable on Ask Ubuntu.) – David Foerster Jan 3 '16 at 10:53

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