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

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Message-ID: <CADDKRnCLUpqy+vxrWUHxkgMsaCfPpObD8CdU_6q0tEcBpyHj8w@mail.gmail.com>
Date:	Tue, 24 Feb 2015 12:03:33 +0100
From:	Jörg Otte <jrg.otte@...il.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>
Subject: Re: [v3.20]: Missing /sys/class/ACAD directory OR Cannot release Mutex

2015-02-24 0:24 GMT+01:00 Rafael J. Wysocki <rjw@...ysocki.net>:
> On Sunday, February 22, 2015 01:33:09 PM Jörg Otte wrote:
>> 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.
>
> Which mainline commit is that?
18320f2 Merge tag 'pm+acpi-3.20-rc1-2' of
git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

>
> The only changes in 4.0-rc1 that can affect that are the ACPI EC updates IIRC.
>
> Is there a chance to try the acpi-ec branch from linux-pm.git and see if the
> problem is there?
Should be no problem. I will give it a try.

Thanks, Jörg
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