linux-kernel - Re: [PATCH] intel-vbtn: match power button on press rather than release

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Message-ID: <20170805205753.GA1277@fury>
Date:   Sat, 5 Aug 2017 13:57:53 -0700
From:   Darren Hart <dvhart@...radead.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Mario Limonciello <mario.limonciello@...l.com>,
        AceLan Kao <acelan.kao@...onical.com>,
        linux-pm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>,
        platform-driver-x86@...r.kernel.org, Len Brown <lenb@...nel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: Re: [PATCH] intel-vbtn: match power button on press rather than
 release

On Sat, Aug 05, 2017 at 01:30:20AM +0200, Rafael Wysocki wrote:
> On Friday, August 4, 2017 7:29:53 PM CEST Darren Hart wrote:
> > On Fri, Aug 04, 2017 at 12:00:06PM -0500, Mario Limonciello wrote:
> > > This fixes a problem where the system gets stuck in a loop
> > > unable to wakeup via power button in s2idle.
> > > 
> > > The problem happens because:
> > >  - press power button:
> > >    - system emits 0xc0 (power press), event ignored
> > >    - system emits 0xc1 (power release), event processed,
> > >      emited as KEY_POWER
> > >    - set wakeup_mode to true
> > >    - system goes to s2idle
> > >  - press power button
> > >    - system emits 0xc0 (power press), wakeup_mode is true,
> > >      system wakes
> > >    - system emits 0xc1 (power release), event processed,
> > >      emited as KEY_POWER
> > >    - system goes to s2idle again
> > > 
> > > To avoid this situation, process the presses (which matches what
> > > intel-hid does too).
> > > 
> > > Verified on an Dell XPS 9365
> > > 
> > > Signed-off-by: Mario Limonciello <mario.limonciello@...l.com>
> > 
> > This looks good to me - responding to the release is non-intuitive IMHO
> > anyway.  I'd like to see agreement from AceLan, but this should go into
> > the 4.13 rc cycle (at rc3 currently).
> 
> Yes, it should, and I'm not sure if the original author's opinion matters here.
> 
> The patch makes sense to everyone involved and fixes an annoying issue, so
> I don't see any real arguments against applying it.
> 
> Please feel free to add my ACK to it if that helps.

I always try to give those in MAINTAINERS a chance to respond, but I will queue
this up to fixes now.

-- 
Darren Hart
VMware Open Source Technology Center