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) .
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) .