I had the same freezing issue on my i5-8250U laptop since I've upgraded the kernel to 4.15.0-151 via apt upgrade. The freeze happened 3x in the morning, once while working in desktop, then twice on the lightdm logging screen. The mouse and keyboard completely froze, all I could do was to turn the laptop off via power button. The temporary fix was to power-cycle and use kernel 4.15.0-147 via grub menu.
I installed the test kernel 4.15.0-153 from Juerg, and so far it seems to fix the issue for me. I did 10 restarts, logging to desktop and starting firefox on this web page. I also did 2 complete power-offs and some compilation as well in between. No issue so far, looks promising. Thanks for checking the issue. Linux pc 4.15.0-153-generic #160~20210728+gitfbbaa7f1 SMP Wed Jul 28 14:25:41 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux Distributor ID: Ubuntu Description: Ubuntu 18.04.5 LTS Release: 18.04 Codename: bionic -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1938013 Title: 4.15.0-151 is freezing various CPUs To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1938013/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
