Dead external monitor on Lenovo ThinkBook 14 G7 IML with Linux 6.15.3

[Andrea Bravetti]

With Linux 6.15.3 the external monitor connected to the HDMI port on a
Lenovo ThinkBook 14 G7 IML is completely dead.

It used to work properly up to 6.15.2.

I filed this bug report for this issue:

https://bugzilla.kernel.org/show_bug.cgi?id=220250

thanks,
Andrea