Seen your post, and my DE is also KDE plasma. I’m not 100% sure if I have the same issue with the pointer (easy to blame it on the game after all) but I’ve been able to do a test reboot with it plugged in and not have the issues I mentioned. That said I have not tried to do anything with grub so I have no data to contribute there.

Multiple reboots, it’d looks like it’s reviving when I unplugged the puck, and when I did the next reboot without the puck it went smoothly. Nobara Linux, it’s from the Proton GE guy.

Mine arrived too, and I’m puzzled by the triggers: they’re smooth! No texture at all. Other than that no hardware issues but the puck… my system doesn’t like it, at least after the latest update. With “doesn’t like it” I mean that I tried American Truck Simulator and I couldn’t get it to run well enough to use any menu and killing it was more about doing so via Steam… that would need to be force closed too. And at reboot? It wouldn’t mount my internal drives! I think it’s the latest firmware, because I could play PowerWash Simulator without any trouble. On the bright side, if it’s firmware, it can be fixed.