Ok the following work around works for me:

Put following lines in an executable script file in 
/etc/init.d/freezingfixwhennoscreenisattached.sh
#========cut================
#!/bin/bash    
for i in 1 2 3 4 5 6  
do
setterm -blank 0 -powersave off -powerdown 0 > /dev/tty$i  
done
#=========paste===================

make script run at boot by running
sudo update-rc.d freezingfixwhennoscreenisattached.sh defaults

-- 
hard freeze after 10 minutes of uptime when no screen is attached
https://bugs.launchpad.net/bugs/518265
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