I've got a brand new ThinkPad X1 Carbon Gen. 9 with no pre-installed OS. After checking that Secure Boot is Off and OS Optimized Defaults are Disabled, I installed Ubuntu 20.04.3 LTS. If I try to shutdown the device, it shows a black screen but does not turn off. The only indicator is that the fans keep spinning. Even the power LED is Off. I waited up to one hour and did a force-shutdown several times by pressing the button for 10s. The problem persists on the next shutdown. All updates are installed.
When I first installed it, I set up LVM and encryption during the installation. This resulted in error messages during shutdown:
systemd-shutdown: Could not detach DM /dev/dm-0: Device or resource busy systemd-shutdown: Failed to finalize DM devices, ignoring
After this, I did a fresh install without LVM and encryption. I don't get the messages anymore, but I still get stuck on the black screen.
I saw several posts about shutdown issues with 20.04, but I couldn't find any solution. Is this device specific? Should I return it and get the same device with the OEM image pre-installed? This would be a complete waste of resources just because Lenovo is not handing out their OEM image and I still don't know if the shutdown is working properly. From my experiences, Ubuntu certifications do not mean a lot in the Lenovo world. The support on the phone keeps telling me I should install Windows. I'm not expecting too much help from their side.