dkms-2.2.0.3-pclos2012
OK, confirmed ... but you should not be using the testing section ... testing is about "possibly unstable packages..."
Anyway, you need to downgrade dkms to version 2.0.19:
to do so open synaptic, select the package
dkms, then
Synaptic Top menu -> Package -> Force version -> 2.0.19, do the same for package
dkms-minimal.
when done, from a terminal run the following commands, other instructions will follow depending on the result:
rpm -qa | grep kernel
dkms status