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

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On 11/24/2016 05:51 PM, Pali Rohár wrote:
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?

Exactly.

--
Best regards,
Jacek Anaszewski
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