Random freeze with 13.0-RC3

Hi

I upgraded a ThinkPad T490 laptop from 12.2 to 13.0-RC3, on now I have 
some random freeze, they seem to occur more when I'm using the laptop 
screen instead of an external display (?!).

When it happens, I don't have a kernel panic, and I'm not able to break 
to the debugger. Any hint on what should I try to get some debug 
information  ?

-- 
Stephane D'Alu