dell - Brightness Profiles Ubuntu 14.04.5 - Ask Ubuntu

usually, laptop screens dim set lowest level of brightness when charger not present, , brighten max level if charger present/connected. however, on dell inspiron 7559 skylake laptop, not happen. laptop on 100% brightness. how can retrieve "feature"?

introduction

the script below modified version of previous scripts, written in python , using dbus exclusively polling ac_adapter presence , setting screen brightness.

usage

usage simple: call command line

python ./brightness_control.py 

the script defaults 100% brightness on ac , 10% on battery. users can use -a , -b set desired brightness levels on ac , battery respectively.

as given -h option:

$ ./brightness_control.py -h                                                                                                           usage: brightness_control.py [-h] [-a adapter] [-b battery]      simple brightness control laptops,     depending on presense of ac power supply   optional arguments:   -h, --help            show message , exit   -a adapter, --adapter adapter                         brightness on ac   -b battery, --battery battery                         brightness on battery 

for example, 1 can of following:

# set non default brightness on ac $ ./brightness_control.py -a 80  # set non-default value brightness on battery $ ./brightness_control.py -b 20  # set non-default values both $ ./brightness_control.py -a 80 -b 20 

source

also available on github

#!/usr/bin/env python """ author: serg kolo <1047481448@qq.com> date:   nov 3rd , 2016 purpose:brightness control depending on         presence of ac adapter written for: http://askubuntu.com/q/844193/295286  """ import argparse import dbus import time import sys  def get_dbus_property(bus_type, obj, path, iface, prop):     """ utility:reads properties defined on specific dbus interface"""     if bus_type == "session":         bus = dbus.sessionbus()     if bus_type == "system":         bus = dbus.systembus()     proxy = bus.get_object(obj, path)     aux = 'org.freedesktop.dbus.properties'     props_iface = dbus.interface(proxy, aux)     props = props_iface.get(iface, prop)     return props  def get_dbus_method(bus_type, obj, path, interface, method, arg):     """ utility: executes dbus method on specific interface"""     if bus_type == "session":         bus = dbus.sessionbus()     if bus_type == "system":         bus = dbus.systembus()     proxy = bus.get_object(obj, path)     method = proxy.get_dbus_method(method, interface)     if arg:         return method(arg)     else:         return method()  def on_ac_power():     adapter = get_adapter_path()     call = ['system','org.freedesktop.upower',adapter,             'org.freedesktop.upower.device','online'     ]      if get_dbus_property(*call): return true  def get_adapter_path():     """ finds dbus path of ac adapter device """     call = ['system', 'org.freedesktop.upower',             '/org/freedesktop/upower','org.freedesktop.upower',             'enumeratedevices',none     ]     devices = get_dbus_method(*call)     dev in devices:         call = ['system','org.freedesktop.upower',dev,                 'org.freedesktop.upower.device','type'         ]         if get_dbus_property(*call) == 1:             return dev  def set_brightness(*args):     call = ['session','org.gnome.settingsdaemon.power', '/org/gnome/settingsdaemon/power',              'org.gnome.settingsdaemon.power.screen', 'setpercentage', args[-1]     ]     get_dbus_method(*call)  def parse_args():     info = """     simple brightness control laptops,     depending on presense of ac power supply     """     arg_parser = argparse.argumentparser(                  description=info,                  formatter_class=argparse.rawtexthelpformatter)     arg_parser.add_argument(                '-a','--adapter',action='store',                type=int, help='brightness on ac',                default=100,                required=false)      arg_parser.add_argument(                '-b','--battery',action='store',                type=int, help='brightness on battery',                default=10,                required=false)     return arg_parser.parse_args()  def main():     args = parse_args()      while true:         if on_ac_power():             set_brightness(args.adapter)             while on_ac_power():                 time.sleep(1)         else:             set_brightness(args.battery)             while not on_ac_power():                 time.sleep(1)  if __name__ == "__main__": main()