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Dual Screen not working on 14.04 when I log in today.  Get error
message:

Failed to apply configuration: %s

GDBus.Error:org.gtk.GDBus.UnmappedGError.Quark._gnome_2drr_2derror_2dquark.Code2:
could not set the configuration for CRTC 63

Yesterday I applied updates.  Ubuntu software history shows these as:

bsdutils(2.20.1-5.1ubuntu20.2,2.20.1-5.1ubuntu20.3)
xserver-xorg-video-intel(2.99.910-0ubuntu1.2,2.99.910-0ubuntu1.3)

Previous to this I have had no problems with dual screen on 14.04.

Solved this by reverting back to the Nouveau driver rather than using
the recommended proprietary driver under the Softwares
&Updates>Additional Drivers link.  The recommended nvidia proprietary
driver (version 331.38) previously worked but doesn't work after the
above Ubuntu updates.  Graphics card used GeForce GT 540M.

** Affects: xorg (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: bot-comment trusty
-- 
nvidia proprietary driver stopped working after ubuntu 14.04 updates from  18 November 2014
https://bugs.launchpad.net/bugs/1394189
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