Comment 56 for bug 1939347

In /etc/default/grub, I added the following kernel parameter:

  GRUB_CMDLINE_LINUX_DEFAULT="i915.enable_dc=0"

Then run sudo update-grub and restart your computer.

This disables GPU power management.

It still freezes for a while, but then it is released and it seems to work. CPU usage seems to be at 100% when it does let go.

I can now at least use my laptop without the dock or using the kernel recovery mode trick.

You can also try limiting the CPU sleep states by adding:
intel_idle.max_cstate=1

Try and see if one or both of those fixes it for you.

I haven't had my laptop running for longer periods yet, so I don't know if this just delays the freezes.