Forgotten Swipe Pattern lock for Nexus 6P (but fingerprint works!)
What you can do since you have such an open phone is unlock the bootloader temporarily and flash a custom recovery to remove the password related files. Here's how:

Unlock your bootloader - 1
Install a custom recovery - 1
Use the custom recovery's &quot;File Manager&quot; feature to remove the following files - 2:

/data/system/password.key
/data/system/pattern.key
/data/system/locksettings.db
/data/system/locksettings.db-shm
/data/system/locksettings.db-wal


Reboot your device
It should now have no password/pattern, enjoy your device
Reinstall stock recovery (should be automatically reinstalled when you reboot) and relocking bootloader - 3 (Optional)