[v3.20]: Missing /sys/class/ACAD directory OR Cannot release Mutex

[JÃrg Otte]

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, JÃrg
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