Boot loop in ubuntu 22.04 - Malformed MSFT vendor event

I've reached a boot loop with Ubuntu 22.04 running on a lenovo legion 7. The last line of the boot sequence before hanging includes:Bluetooth: hci0: Malformed MSFT vendor event: 0x02. If I use the grub recovery boot I don't seem to find any problems with diskspace or the like, and update/upgrade are to no avail. I can occasionally get back to the Ubuntu GUI albeit without trackpad - only an external mouse will work. Booting the same machine to windows works ok although the same weird missing trackpad persists, no driver problems detected in windows 11.