linux-kernel - Re: kworker/0:3+pm hogging CPU

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Message-ID: <20200721161444.GE1272082@rowland.harvard.edu>
Date:   Tue, 21 Jul 2020 12:14:44 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, "Rafael J. Wysocki" <rjw@...ysocki.net>
Subject: Re: kworker/0:3+pm hogging CPU

On Tue, Jul 21, 2020 at 06:00:25PM +0200, Michal Hocko wrote:
> On Tue 21-07-20 10:33:25, Alan Stern wrote:
> [...]
> 
> Thanks a lot for your analysis. The laptop is slowly dying so this can
> be related.
> 
> > So yes, this looks like a hardware design error.  Turning off 
> > autosuspend by writing to the sysfs power/control file is probably the 
> > best way to handle the problem.
> 
> I can use that workaround. But it seems that this also prevents me from
> suspending the maching into RAM with
> PM: Some devices failed to suspend, or early wake event detected
> 
> :/
> 
> If there is any workaround for that then I would be really happy but
> considering the overal state of the machine I suspect this is not the
> case.

As far as I know there is no workaround.

Of course, you could build your own personal kernel with the 
over-current test removed from the driver.  But keeping that up-to-date 
would be a nuisance.

> Thanks again for your great help!

You're welcome.

Alan Stern