So you don't have a problem with this bug on your system? You want to upgrade to testing just to try and fix this bug...?
Well if you're set on the idea:
Comment out/remove your existing sources and add the following:
deb http://ftp.us.debian.org/debian testing main contrib non-free
Then kill the x server and
# apt-get update && apt-get dist-upgrade
It may be a bumpy ride... time to brush up on your apg-get foo...