I tried to reproduce this, now I receiver this error:

ubuntu@ubuntu:~$ xrandr --output HDMI-1-1 --mode 1920x1080
X Error of failed request:  BadValue (integer parameter out of range for 
operation)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  7 (RRSetScreenSize)
  Value in failed request:  0x0
  Serial number of failed request:  45
  Current serial number in output stream:  46

I could not get the notebook screen and the external online, notebook is
black.

Graphic errors are the same as before.
But I would say, the slow reaction time is maybe not because of fps. For 
example, the terminal is sometimes very slow, I could type something and it is 
written a second ago.
Graphics seems to be smooth, but the screen is not refreshing, for ex.
http://www.xup.in/dl,94747980/IMG_20140130_212721.jpg/

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https://bugs.launchpad.net/bugs/1040053

Title:
  10de:0df4 [Dell XPS 15 L502X] no nouveau HDMI support with dual grafic
  card in Ubuntu 12.04LTS with 3.2.0-29-generic

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