On Wednesday 23 November 2016 12:01:02 Jacek Anaszewski wrote:
> I would also appreciate your opinion on the other solution to the
> problem of notifying brightness changes originating from hardware,
> i.e. hw_brightness_change{_ro} file, that would support POLLPRI events,
> and reading brightness.
Another idea:
If no trigger is active then led subsystem will invoke POLLPRI on
"brightness" sysfs file.
And if there is active trigger then only trigger code could invoke
POLLPRI on "brightness" file.
This could solve problem with high CPU load and power usage when e.g.
cpu trigger is active (and cpu trigger will not implement any POLLPRI).
Do not know if this is really enough for your situation, it is just and
another idea.
But first please update documentation in ABI/testing to match current
situation. That is really needed.
--
Pali Rohár
pali.rohar@xxxxxxxxx
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