** Description changed:

+ [ Impact ]
+ 
+ Using `gdctl show` in a machine without backlights control may crash
+ 
+ [ Test case ]
+ 
+ In a machine where the monitor has no software backlight control, run:
+ 
+  $ gdctl show
+ 
+ The command should show the current monitor(s) configuration without
+ throwing any python error (e.g. TypeError: cannot unpack non-iterable
+ NoneType object).
+ 
+ In a machine where the monitor has software backlight control, do the
+ same and again no error should be triggered.
+ 
+ [ Regression potential ]
+ 
+ The backlight information may not be shown in machines that have it, but
+ that is not properly exposed by the DBus API.
+ 
+ ---
+ 
+ 
  The Ubuntu Error Tracker has been receiving reports about a problem regarding 
mutter.  This problem was most recently seen with package version 
50.1-0ubuntu2, the problem page at 
https://errors.ubuntu.com/problem/24661a2271059619e2c1a00d95aeafef5c78ac05 
contains more details, including versions of packages affected, stacktrace or 
traceback, and individual crash reports.
  If you do not have access to the Ubuntu Error Tracker and are a software 
developer, you can request it at http://forms.canonical.com/reports/.
  
  ---
  External link: https://warthogs.atlassian.net/browse/UDENG-10136

-- 
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https://bugs.launchpad.net/bugs/2149823

Title:
  /usr/bin/gdctl: TypeError on /usr/bin/gdctl@1717: print_current_state
  → print_monitor_prefs → get_backlight

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