Hello Michel, I have installed the latest stable ubuntu kernel after my laptop froze again half an hour ago (but still accessible through ssh). # uname -a Linux antonioRyzen 4.18.0-041800-generic #201808122131 SMP Sun Aug 12 21:33:20 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux With this one at least no call trace are being shown in the log. I'll let you know if it freezes again. Thanks!