I have exactly the same on my Ubuntu 14.04 Dell Precision M4700. It has an AMD card (see below), so it doesn't seem the problem is nvidia and/or driver specific.
$ lspci | grep -i vga
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Chelsea XT GL [FirePro M4000]
A few months ago, I switched between proprietary and opensource drivers, IIRC the problem wasn't there before the switch. I'm actually not sure what I have installed now; this is what dpkg tells me:
$ dpkg -l | grep -i '^ii.*fglrx'
ii fglrx-amdcccle-updates 2:15.201-0ubuntu0.14.04.1 amd64 Catalyst Control Center for the AMD graphics accelerators
ii fglrx-updates 2:15.201-0ubuntu0.14.04.1 amd64 Video driver for the AMD graphics accelerators
ii fglrx-updates-core 2:15.201-0ubuntu0.14.04.1 amd64 Minimal video driver for the AMD graphics accelerators
I have exactly the same on my Ubuntu 14.04 Dell Precision M4700. It has an AMD card (see below), so it doesn't seem the problem is nvidia and/or driver specific.
$ lspci | grep -i vga
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Chelsea XT GL [FirePro M4000]
A few months ago, I switched between proprietary and opensource drivers, IIRC the problem wasn't there before the switch. I'm actually not sure what I have installed now; this is what dpkg tells me:
$ dpkg -l | grep -i '^ii.*fglrx' updates 2:15.201- 0ubuntu0. 14.04.1 amd64 Catalyst Control Center for the AMD graphics accelerators 0ubuntu0. 14.04.1 amd64 Video driver for the AMD graphics accelerators 0ubuntu0. 14.04.1 amd64 Minimal video driver for the AMD graphics accelerators
ii fglrx-amdcccle-
ii fglrx-updates 2:15.201-
ii fglrx-updates-core 2:15.201-