[Sugar-devel] [FEATURES] Display Device

[Paul Fox]

peter wrote:
 > On Mon, Nov 21, 2011 at 3:33 PM, Simon Schampijer <simon at schampijer.de> wrote:
 > > El 21/11/11 15:18, Paul Fox escribió:
 > >>
 > >> simon wrote:
 > >>  >  Hi,
 > >>  >
 > >>  >  I would like to propose the following Feature to enhance the Sugar
 > >>  >  learning environment:
 > >>  >
 > >>  >  "Add a frame device to control the display. The idea is to add their
 > >> an
 > >>  >  option to change the brightness and to take a screenshot. Both actions
 > >>  >  are only available via the keyboard as of today." [1]
 > >>
 > >> oh, good idea.  in fact, i have another job for it to do.  :-)
 > >> it would be great if it could switch the display from color to
 > >> monochrome, as well.  see my email on automatic backlight control,
 > >> which i've composed but haven't sent yet.  i'll do so right now.
 > >>
 > >> paul
 > >
 > > Hi Paul,
 > >
 > > I just looked at olpc-kbdshim the olpc-brightness for how we adjust the
 > > brightness on the XO. Looks like we simply echo the values to the files like
 > > '/sys/class/backlight/dcon-bl/brightness'. I wonder what the generic
 > > solution is for that (Sugar on other devices).
 > >
 > > From a quick test, I have the following files on my T61:
 > > /sys/class/backlight/intel_backlight/max_brightness and
 > > /sys/class/backlight/intel_backlight/actual_brightness which change
 > > accordingly when adjusting the brightness. But I guess there is a generic
 > > tool for doing that...?
 > >
 > > /me should probably have a look what GNOME is doing...
 > 
 > There's recently been introduced a generic backlight class so I think
 > its all being converted over to that. Its like the IBM one in
 > /sys/class/backlight but I'm not sure the full details for
 > manipulating it programaticly but I'm sure its documented somewhere.
 > 
 > Some details are:
 > https://lwn.net/Articles/423170/
 > https://wiki.kubuntu.org/Kernel/Debugging/Backlight

we seem to implement anything mentioned in those two links.  i wouldn't
be surprised if there was a more recent higher level interface that
might be useful.

paul
=---------------------
 paul fox, pgf at laptop.org