[Bugs] #4681 Sugar UNSP: Show icon indicating volume and brightness levels when corresponding button is pressed

[Sugar Labs Bugs]

#4681: Show icon indicating volume and brightness levels when corresponding button
is pressed
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  Reporter:  martasd                    |            Owner:
      Type:  enhancement                |           Status:  new
  Priority:  Unspecified by Maintainer  |        Milestone:  Unspecified
 Component:  Sugar                      |          Version:  0.98.x
  Severity:  Unspecified                |       Resolution:
  Keywords:                             |  Distribution/OS:  Unspecified
Bug Status:  Unconfirmed                |
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Comment (by quozl):

 It is not enough to detect the keys.

 Because of #1677, the volume change detection must be built using the ALSA
 API.  See the alsaaudio or pyalsa modules.  See also dev.laptop.org
 !#9913.

 Brightness changes will be even more complex.  Sugar does not handle
 brightness at the moment.
 Change detection might read ''/sys/devices/platform/dcon/backlight/dcon-
 bl/brightness'' on an XO, but on other systems it isn't clear what can be
 used.
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Ticket URL: <http://bugs.sugarlabs.org/ticket/4681#comment:1>
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