[PATCH] fix hald-addon-dell-backlight AC detection

[Danny Kukawka]

Hi,

this fixes fd.o bug #13669 and hald-addon-dell-backlight which uses a 
hardcoded udi to get AC adapter information. With the switch to sysfs 
power_supply devices for AC adapter the path is no longer valid. I changed 
the code to check all devices with ac_adapter capability and check then all 
AC adapter until a device has ac_adapter.present and then get the info about 
the adapter state from there.

See attached patch (untested atm, test it tomorrow/later today).

Danny

 addon-dell-backlight.cpp |   25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)
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