Need help to debug freeze on IBM T41

[Per olof Ljungmark]

bob at a1poweruser.com wrote:
> 5.4 is not an stable release yet. Its still under development.
> People who try to use this bleeding edge version are suppose to know
> how to debug kernel code.  You will be much better off using 4.11
> release which is very stable and rock hard. All the 5.x version
> still have major bugs it them.  Use at your own risk.

I AM using it at my own risk. I KNOW 4.11 is stable. I was asking for a 
hint on how I could LEARN MORE instead of JUST COMPLAINING.