Dell XPS 13 9380 - System hangs when connecting bluetooth since kernel 5.6.0-1048-oem

[da-phil]

Since the kernel upgrade to 5.6.0-1048-oem my Dell XPS 13 9380 starts to hang and finally freezes when I want to connect to my AV-receiver over bluetooth. There is something funky going on in the kernel, hence I attached the dmesg kernel messages since system boot.

All consecutive versions > 5.6.0-1048-oem show the same behaviour, hence I'm still booting 5.6.0-1047-oem currently.

I tried the 5.4 kernel series and the latest one (5.4.0-72-generic) was also working fine.

The only HW change I did to my Dell XPS 13 9380 was changing my SSD to a bigger Samsung SSD 970 EVO Plus 1TB, everything is as I ordered it.

I read about bluetooth vulnerability fixes in exactly the version where the problem started here: https://ubuntu.com/security/notices/USN-4752-1
Maybe that has something to do with the issue?

Can somebody reproduce this issue?

lsb_release -rd
```
Description: Ubuntu 20.04.2 LTS
Release: 20.04
```

[da-phil (carcass-dev0)]

Problem seems to be gone with the newer 5.10.0-1028-oem kernel.