Keyboard freeze

[stevef]

I am not sure where to start troubleshooting.

Freeze problems are difficult.
Can you provide a bit of context ?
For example
Does the system recover from the freeze by itself if you leave it ?
How do you restore access ?
Is the problem reproducible ? Do certain things trigger a freeze ?
Does it freeze if you leave the system totally alone ?
Is there a pattern that may indicate a temperature problem ?

When it freezes, is the computer completely unresponsive or are there some signs of life such as the keyboard indicators toggling if you press 'Num Lock' or 'Caps Lock'.
Does the on screen clock continue to update during a freeze ?

When it freezes does pressing Ctl Alt and F2 together have any effect ?

Adding intel_idle.max_cstate=1 in the grub configuration file did not help

Have you reversed this ?
Have you made any other changes ?