[Bugs] #4016 sugar NORM: Touch: change brightness and mode

[Sugar Labs Bugs]

#4016: Touch: change brightness and mode
----------------------------+-----------------------------------------------
    Reporter:  erikos       |          Owner:  erikos  
        Type:  enhancement  |         Status:  new     
    Priority:  Normal       |      Milestone:  1.0     
   Component:  sugar        |        Version:  0.97.x  
    Severity:  Major        |       Keywords:  touch   
Distribution:  OLPC         |   Status_field:  Assigned
----------------------------+-----------------------------------------------
 This missed the 0.98 boat. One idea was to make it available as a Display
 device icon for the Frame.
 http://wiki.sugarlabs.org/go/Features/Display_Device

 We have a workaround: use the brightness keys in laptop mode.

 Powerd accesses:

 /sys/class/backlight/dcon-bl/brightness and
 /sys/devices/platform/dcon/monochrome which is hardware specific.

 Test: echo 13 > /sys/class/backlight/dcon-bl/brightness

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Ticket URL: <http://bugs.sugarlabs.org/ticket/4016>
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