This message was posted on behalf of Intel Corporation
mgcrea: Thank you very much for joining the Intel® NUC communities. We are sorry to hear that the NUC is not working properly.
In order to try to fix this problem we can try a BIOS update on the NUC to the latest version 0041 using the F7 method:
We do know that a lot of users are successfully using Linux distro's on their units. If the problem persist after trying the BIOS update and since we provide limited support for that operating system, my recommendation in order to get further assistance on this matter will be to check the Linux forums for peer to peer assistance, in there you should be able to get more suggestions on this subject:
Any further questions, please let me know.
I've updated to the latest bios (version 0041) and there is still no hardware watchdog device being detected.
The Intel TCO WatchDog Timer Driver probably needs a patch to add support.
Intel doesn’t officially provide support or drivers for Linux* please check the following url for further information: https://www.intel.com/content/www/us/en/support/boards-and-kits/intel-nuc-boards/000005628.html. This doesn’t mean that Linux or any other operating system different than Windows* will not work on this device, it means that we don’t do official validation or testing and in addition to that, the Intel® NUC Kit NUC6CAYS comes with Windows 10 Home (64-bit) Pre-Installed.
I would recommend that you post this question to a Linux community, they may be able to help you with that.