I tried to disable DMA this time (patch applied, external monitor
disconnected):

Section "Device"
        Identifier "Configured Video Device"
        Option "EnableAGPDMA" "false"
        Option "NoAGPFor2D"
        Option "NoXVDMA"
EndSection

The result is system freeze.

** Attachment added: 
"Xorg.0.log-patched-DMA_disabled-external_monitor_disconnected"
   
http://launchpadlibrarian.net/28454174/Xorg.0.log-patched-DMA_disabled-external_monitor_disconnected

-- 
[K8M800] mouse pointer corruptly displayed at the bottom of the X screen
https://bugs.launchpad.net/bugs/386740
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which is subscribed to xserver-xorg-video-openchrome in ubuntu.

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