linux-kernel - Re: thinkpad x60: sound problems in 4.15-rc1 was Re: thinkpad x60: sound problems in 4.14.0-next-20171114

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Date:   Mon, 25 Dec 2017 11:12:20 +0100
From:   Pavel Machek <pavel@....cz>
To:     vcaputo@...garu.com
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: thinkpad x60: sound problems in 4.15-rc1 was Re: thinkpad x60:
 sound problems in 4.14.0-next-20171114

Hi!

> It's this allocation domain mask hook which has been bypassed by the
> offending commit.  The existing approach is more robust in the face of
> relaxed adherence to destination cpumasks since it's all-inclusive,
> whereas the new code is exclusive to a specific cpu.
> 
> Is it possible what I'm observing is just another manifestation of
> what's being described in that comment?  This is a core 2 duo, so not
> hyper-threaded.  But maybe something funny happens when switching
> cstates in response to interrupts - like maybe the wrong cpu can be used
> if it can save power vs. powering up another?  Just thinking out loud
> here.
> 
> In any case, 4.15-rc4 is quite unusable on my machine because of this.
> 
> Pavel, do you observe the same behavior on your x60, WRT AC power?

No.. no Monitor-Mwait messages, and audio works if I unplug AC.

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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