I haven't been able to compile 5.8-rc4 for some reason but have had success with 5.4.0-44 - I applied the patch to 5.4.0-44 and attached the dmesg file here. Hope this helps.
** Attachment added: "kernel messages from serial patched kernel 5.4.0-44" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886827/+attachment/5401335/+files/dmesg.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1886827 Title: Machine hangs when doing a normal reboot To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1886827/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
