I put together an Intrepid desktop VM to come up with explicit
instructions on upgrading to the -14 kernel in interpid-proposed.

/etc/apt/sources.list.d/proposed.list contains:

deb http://archive.ubuntu.com/ubuntu/ intrepid-proposed main

/etc/apt/preferences contains:

Package: *
Pin: release a=intrepid-security
Pin-Priority: 990

Package: *
Pin: release a=intrepid-updates
Pin-Priority: 900

Package: *
Pin: release a=intrepid-proposed
Pin-Priority: 400

sudo aptitude update

sudo aptitude -t intrepid-proposed install linux-image-2.6.27-14-generic

and maybe if you have the need for the kernel headers as well:

sudo aptitude -t intrepid-proposed install linux-
headers-2.6.27-14-generic

The base header package will be pulled in automatically.

reboot into new kernel

Unfortunately, update-manager will pester you about other intrepid-
proposed packages.  To stop this comment out the intrepid-proposed apt
repository and "sudo aptitude update" again.  The kernel will not
downgrade because of the /etc/apt/preferences configuration.

/etc/apt/sources.list.d/proposed.list will contain:

# deb http://archive.ubuntu.com/ubuntu/ intrepid-proposed main

-- 
[intrepid] soft lockup on Aspire M3610 - ZE7Z
https://bugs.launchpad.net/bugs/300329
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