I also have been having system freezes since 10.04. Two types of symptoms ,
1. mouse hangs , does not seem to depend on any particular activity, only cure 
is hard boot.
2. if sound is playing approx 2 seconds of sound is repeated continuously in 
addition to mouse freeze. Only cure is hard boot.

This has happened on clean installs of 10.04, 10.1 and 11.4 , all
exactly same symptoms.

Only workaround I have found is to boot with acpi=off in GRUB , never
had a freeze using this option  but with this option system will not
power off with the "shutdown" command so have to manually power off (not
good) .

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in ubuntu.
https://bugs.launchpad.net/bugs/574152

Title:
  64bit Ubuntu 10.04 Stops Responding

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