This adds ddc monitor control and glues it into the backlight system.
A result of this is now backlgiht control gadgets work screen by
screen and even on desktop monitors as well as on a laptop panel. If
you now put a backlight gadget on a shelf on each screen... it will
control THAT screen's backlight.
This requires libddcutil to be installed. That will require i2c
modules (i2c-dev specifically). This means that this is likely not
going to do anything useful on bsd's... unless libddcutil happens to
work there by chance.
so install ddcutil/libddcutil. ensure it's in ld.so.conf so setuid
root processes find it (as LD_LIBRARY_PATH won't help) and enjoy your
new funcky per-screen backlight controls... :)
@feature
so e has had a bit of a mess of setuid root tools to do things that
are essential to maintaing a functioning desktop/laptop/tablet/phone
like device like shutting it down or suspending or sqizzling the cpu
governor or messing with the backlight or... you get the idea.
this has been spread around enlightenment_sys and other special
purpose tools. this now unifies it into a single "always there"
enlightenment_system backend setuid root slave process whose job it is
to do all these things via a stdio protocol in an organized way. this
means latency to do something is lower, but at the expense of
consuming ram and a lurking process. unfortunately the lurking will be
needed soon when i add ddc support to make it even vaguely efficient,
so it's a cost i guess we have to pay now. we'll need this in future
as well for some stats collection and more.
still need to port existing code to use this instead of the existing stuff,
and then remove of the old stuff.
Carsten Haitzler