Got the same error this morning.
Note that it happens after an apt-get dist-upgrade with an update of mesa + 
reboot

Same error this morning when I plugged an external monitor:

GL_VENDOR = Intel Open Source Technology Center
GL_RENDERER = Mesa DRI Intel(R) Ivybridge Mobile x86/MMX/SSE2
GL_VERSION = OpenGL ES 3.0 Mesa 9.2.1
dm_connection_start
set_active_session '0'
set_active_session
set_active_session '1'
set_active_session
Unable to set active session, unknown client name 1
pause
terminate called after throwing an instance of 
'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::runtime_error>
 >'
  what():  Failed to set DRM crtc


** Also affects: mesa (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1194039

Title:
  Cannot start any Mir server ... std::exception::what: Failed to set
  DRM crtc

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