After further testing and log analysis, this does not appear to be a kernel panic or split-lock related issue.
The system powers off abruptly on battery power without any kernel panic, oops, or shutdown sequence. journalctl -b -1 --system shows logging stopping abruptly while the system is otherwise running normally. This strongly suggests a firmware / embedded controller (EC) / ACPI interaction issue, possibly related to battery protection or suspend/resume handling. The issue reproduces across multiple kernels (6.14.x HWE and 6.8.x), occurs most often on battery and during or after suspend, and requires AC power to recover. Battery percentage is often reported as high (40–90%) at time of power loss. Additionally, after reconnecting AC following a crash, the battery charge level sometimes immediately jumps from ~80–90% to 100%, suggesting battery state desynchronization or EC reset. Attaching system journal from the previous boot for reference. ** Attachment added: "crash-log.txt" https://bugs.launchpad.net/ubuntu/+source/linux-hwe-6.14/+bug/2136113/+attachment/5939657/+files/crash-log.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2136113 Title: Suspend crash on battery To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-6.14/+bug/2136113/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
