This problem is also reproducible with same
xrandr --output VGA --mode 1024x768
command when launched with a custom button (see configuration in attachment)

Hope this could help.

** Attachment added: "Custom button configuration which reproducise this 
problem"
   http://launchpadlibrarian.net/20773977/xrandButton.jpg

-- 
[i965] Reducing resolution on 965G using Screen Resolution locks system up with 
flashing/blinking screen
https://bugs.launchpad.net/bugs/224508
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