Creating a basic xorg.conf file and adding these lines works around the
problem:

Section "Monitor"
        Identifier      "HDMI1"
        Option          "Ignore" "True"
EndSection

Section "Monitor"
        Identifier      "HDMI2"
        Option          "Ignore" "True"
EndSection

Section "Monitor"
        Identifier      "DP1"
        Option          "Ignore" "True"
EndSection

Section "Monitor"
        Identifier      "DP2"
        Option          "Ignore" "True"
EndSection

Section "Monitor"
        Identifier      "DP3"
        Option          "Ignore" "True"
EndSection

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/957298

Title:
  Mouse is very slow after starting a session on Precise

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/957298/+subscriptions

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