[Differential] [Request, 18 lines] D2470: [upowerbackend] set cached brightness manually in case of led backlight

[bshah (Bhushan Shah)]

bshah created this revision.
bshah added reviewers: Plasma, broulik.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  In normal backlight subsystem's drivers typical workflow is,
  
  - setBrightness gets called
  - it writes to sysfs file using backlight helper
  - kernel sends uevent for brightness change
  - onDeviceChanged is triggered
  - we update cache value
  
  However in case of leds subsystem, kernel doesn't send uevent for
  brightness change, hence uevent is never triggered and this doesn't
  update cached value of brightness, resulting in DBus signal for
  brightnessChanged never being emitted.

TEST PLAN
  Tested on Nexus 5 which uses leds subsystem

REPOSITORY
  rPOWERDEVIL Powerdevil

BRANCH
  workaround-broken-backlight-driver (branched from master)

REVISION DETAIL
  https://phabricator.kde.org/D2470

AFFECTED FILES
  daemon/backends/upower/powerdevilupowerbackend.cpp
  daemon/backends/upower/powerdevilupowerbackend.h

EMAIL PREFERENCES
  https://phabricator.kde.org/settings/panel/emailpreferences/

To: bshah, #plasma, broulik
Cc: plasma-devel, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas
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