[Differential] [Request, 3 lines] D2775: Emit brightnessSupportQueried with the proper value

[broulik (Kai Uwe Broulik)]

broulik created this revision.
broulik added a reviewer: Plasma.
broulik set the repository for this revision to rPOWERDEVIL Powerdevil.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  Just because the sysfs helper succeeded, doesn't mean we actually have screen brightness support.
  Only if maximum brightness greater than 0 is reported, we'll announce its support.
  This fixes the brightness slider showing up in the KCM on desktop computers. The battery monitor already has the same logic and correctly did not show brightness sliders in this case.

TEST PLAN
  Compiles.
  On desktop with 5.7 right now, don't want to mess up my setup with kded powerdevil vs standalone binary ;)

REPOSITORY
  rPOWERDEVIL Powerdevil

REVISION DETAIL
  https://phabricator.kde.org/D2775

AFFECTED FILES
  daemon/backends/upower/powerdevilupowerbackend.cpp

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