** Description changed: I'm using KDE Plasma on Ubuntu 21.10 with kernel 5.13.0-19. Recently, my laptop has been freezing upon unplugging the power cord. The sysrq keys do not work when this occurs. - When I switch kernels, the problem does not occur. The following - kernels do not freeze when I unplug the power cable. + Previously, the problem appeared to resolve when switching kernels. + However, when I tried to obtain logs, the problem began to occur on all + installed kernels (5.14.12, 5.13.19, and 5.13.18 from + https://kernel.ubuntu.com/~kernel-ppa/mainline/). - * kernel 5.14.12 from https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.14.12/ - * kernel 5.13.19 from https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.13.19/ + Logs cannot be obtained because none appear to be saved to disk during + the crash. (journalctl -k -b -1) - When I boot back into the 5.13.0-19 kernel, the problem recurs. - - I had also tried changing various system settings, bios settings, and - packages, none of which made any difference, aside from switching + Since the problem appears kernel related, I tried removing potentially + problematic kernel options from /etc/default/grub. After removing all + acpi and i915 options (which I had enabled because they had previously + been needed to make the backlight work and reduce gpu crashes), the + problem again *appears* to have resolved with all of the aforementioned kernels.
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1947484 Title: Ubuntu 21.10, 5.13.0-19. System freeze when power cable unplugged To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1947484/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
