backlight device, suspend/resume...

Chris Ball cjb at
Wed Jul 9 00:51:25 CEST 2008


   > Mike (mwester) wrote:
   >> In practice, compromise is necessary.  Can we at least let the
   >> kernel bring the backlight up to a level that would allow the user
   >> to see vague outlines of something on the screen?  Or failing
   >> that, can we make the backlight level on resume configurable in
   >> some way?

   > If you need this, why not set the backlight to "dim" instead of
   > "off" before requesting the suspend ?

   > The secret about successful kernel programming is to do as little
   > as possible in the kernel :-)

At OLPC, we're using a small userspace policy daemon called OHM¹ to make
decisions like these -- when to dim, when to suspend, how to tell if the
user is "idle".  I'd be happy to help get it running on the FR if it's

- Chris.

Chris Ball   <cjb at>

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