Starting with kernel 3.19.0-05184-g18320f2, I often find my notebook running with 'powersave' policy even if it is on AC.
It turned out that /sys/class/ACAD directory is missing and in the logs I see: ACPI Error: Cannot release Mutex [MUT0], not acquired (20150204/exmutex-376) ACPI Error: Method parse/execution failed [\_SB_.ACAD._PSR] (Node ffff880216028d48), AE_AML_MUTEX_NOT_ACQUIRED (20150204/psparse-536) ACPI Exception: AE_AML_MUTEX_NOT_ACQUIRED, Error reading AC Adapter state (20150204/ac-131) At the last 25 startups since 3.19.0-05184-g18320f2 it occured 13 times. It does not occur with kernels older than 3.19.0-05184-g18320f2. Thanks, Jörg -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
