linux-kernel - Re: PM regression with LED changes in next-20161109

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Date:   Thu, 10 Nov 2016 10:55:37 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Pavel Machek <pavel@....cz>
Cc:     Jacek Anaszewski <j.anaszewski@...sung.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        linux-leds@...r.kernel.org, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Darren Hart <dvhart@...radead.org>
Subject: Re: PM regression with LED changes in next-20161109

* Pavel Machek <pavel@....cz> [161110 09:29]:
> Hi!
> 
> > >>>Looks like commit 883d32ce3385 ("leds: core: Add support for poll()ing
> > >>>the sysfs brightness attr for changes.") breaks runtime PM for me.
> > >>>
> > >>>On my omap dm3730 based test system, idle power consumption is over 70
> > >>>times higher now with this patch! It goes from about 6mW for the core
> > >>>system to over 440mW during idle meaning there's some busy timer now
> > >>>active.
> > >>>
> > >>>Reverting this patch fixes the issue. Any ideas?
> 
> Are you using any LED that toggles with high frequency? Like perhaps
> LED that is lit when CPU is active?

Yeah one of them seems to have cpu0 as the default trigger.

Tony