[Expired for linux (Ubuntu) because there has been no activity for 60
days.]
** Changed in: linux (Ubuntu)
Status: Incomplete => Expired
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https://bugs.launchpad.net/bugs/1947484
Title:
Ubuntu 21.10, 5.13.0-19. System freeze when power cable unplugged
Status in linux package in Ubuntu:
Expired
Bug description:
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.
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/).
Logs cannot be obtained because none appear to be saved to disk during
the crash. (journalctl -k -b -1)
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.
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