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[peddanet <1124328@xxxxxxxxxxxxxxxxxx>]

That is funny. For me everything worked fine after upgrading 14.04. The
dual monitor set up works briliantly after using the additional driver
package for ati radeon graphic card adapters (fglrxx-updates).

It stopped working and producing exactly the same behaviour after
working on another issue with compiz (skydome, cube rotating not working
properly under 14.04). After trying to fix that, it fails, and the dual
monitor vanished after logging in, leaving two black blank screens. In
the error log there were repeatedly the above mentioned message.

The odd workaround works (plugging off), after changing from Terminal 8
to 7 again (ctrl-alt-F8 and then ctrl-alt-F7 again), then immediately
the second monitor came back again....

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https://bugs.launchpad.net/bugs/1124328

Title:
  *ERROR* failed to set mode on [CRTC:7]

Status in The Linux Kernel:
  Invalid
Status in “linux” package in Ubuntu:
  Incomplete
Status in “xserver-xorg-video-intel” package in Ubuntu:
  Opinion
Status in Fedora:
  Unknown

Bug description:
  When I boot I receive this error. This is the same bug being tracked
  (and possibly ignored) by redhat. Please see the link for logs that
  others have submitted etc...

  https://bugzilla.redhat.com/show_bug.cgi?id=753050

  I am using a Thinkpad T430s docked with DVI monitor and VGA monitor (a
  common configuration I would imagine). I read that there is a hardware
  limitation for supporting LVDS+DVI+VGA concurrently, but since the
  laptop is docked (and screen closed) I don't believe this explains the
  bug.

  For the record, I am using 
  Ubuntu Release:	12.10
  kernel 3.5.0-23-generic
  Graphics: 00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09)
  	Subsystem: Lenovo Device [17aa:21fb]
  	Kernel driver in use: i915

  
  Please let me know how I can be of any further help.

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