Public bug reported:

I have an ASUS Z96J laptop (this is basically the same as an S96J).
When laptop is booted with the bluetooth module loaded, I randomly get
freezes.  Looking at syslog, this is caused by the Intel 3945 driver
needing to be reset on a regular basis.

If I blacklist the bluetooth module by editing /etc/modprobe.d/blacklist and 
adding:
blacklist bluetooth
to the end of it, the problem goes away.  Now I just get a number of entries in 
my syslog complaining, "WARNING: Not loading blacklisted module bluetooth".

I was also getting a lot of "ata2 is slow to respond, please be patient"
which seem to have stopped.

Note that I have to boot with acpi=off in order for my root file system
to be found.  This may be part of the problem.

** Affects: Ubuntu
     Importance: Untriaged
         Status: Unconfirmed

-- 
Bluetooth causes random freezes
https://launchpad.net/bugs/56762

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