Lenovo ThinkPad P50

Remapping useless keys
The keys - to - aren't particularly useful out of the box. A nice application is to (low level) remap the keys to media buttons. This can be done via udev:

and reload the hwdb database:

If this doesn't work, reboot.

Toggle touchpad with -
To toggle the touchpad with - add an additional line:

TPM (and suspend/resume)
A common problem can be encountered if the TPM chip has been activated in UEFI/BIOS. If the kernel lacks the necessary drivers the system freezes when attempting to resume from a suspend. Simply configuring the kernel with TPM supports resolves the problem: