I’ve now updated the kernel to match the new NVIDIA driver API that’s shipped in Debian Jessie. I’ve pushed this to the main repository so all you need to do is update again for things to work as expected.
Remember to make sure you power off your device properly or /boot will be mounted as RO and updates will fail unless you manually fsck and remount the volume.
Thanks for your patience while I resolved the issue.
Cheers
Sam