Re: [PATCH v5 2/6] leds: triggers: Add a keyboard backlight trigger

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On Thursday 24 November 2016 17:21:19 Jacek Anaszewski wrote:
> On 11/24/2016 04:36 PM, Pali Rohár wrote:
> > On Thursday 24 November 2016 16:32:06 Jacek Anaszewski wrote:
> >> Since it has been reported that POLLPRI notifications on
> >> brightness file can lead to increased power consumption, and
> >> having my above statement I don't think that it is a good idea to
> >> use brightness file for this.
> > 
> > How is brightness file different from others that it cannot issue
> > POLLPRI notification?
> > 
> > I understood that problem is there in case that LED level is
> > changed too many times per second (like by CPU trigger).
> > 
> > If this is not that problem can you describe real issue, why we
> > cannot use POLLPRI for brightness file?
> 
> It would be inconsistent not to notify all brightness changes on
> brightness file. We should notify all of them or none.

I understood that we cannot notify about changes done by CPU trigger due 
to high power usage... Or not?

-- 
Pali Rohár
pali.rohar@xxxxxxxxx

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