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See [this thread](https://forums.puri.sm/t/phone-call-api/8433) for context.
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### Getting/Setting Screen Brightness
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## Getting/Setting Screen Brightness
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Introspect the GNOME Settings daemon to see what interfaces are available:
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```
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gdbus introspect --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power
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gdbus introspect --session \
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--dest org.gnome.SettingsDaemon.Power \
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--object-path /org/gnome/SettingsDaemon/Power
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```
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The `org.gnome.SettingsDaemon.Power.Screen` interface is relevant:
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Get all properties related to the screen:
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```
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gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.freedesktop.DBus.Properties.GetAll org.gnome.SettingsDaemon.Power.Screen
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gdbus call --session \
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--dest org.gnome.SettingsDaemon.Power \
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--object-path /org/gnome/SettingsDaemon/Power \
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--method org.freedesktop.DBus.Properties.GetAll \
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org.gnome.SettingsDaemon.Power.Screen
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```
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This should return something like the following:
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```
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The brightness can be individually read:
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```
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gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.freedesktop.DBus.Properties.Get org.gnome.SettingsDaemon.Power.Screen Brightness
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gdbus call --session \
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--dest org.gnome.SettingsDaemon.Power \
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--object-path /org/gnome/SettingsDaemon/Power \
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--method org.freedesktop.DBus.Properties.Get \
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org.gnome.SettingsDaemon.Power.Screen Brightness
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```
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It can also be set:
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```
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gdbus call --session --dest org.gnome.SettingsDaemon.Power --object-path /org/gnome/SettingsDaemon/Power --method org.freedesktop.DBus.Properties.Set org.gnome.SettingsDaemon.Power.Screen Brightness '<30>'
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gdbus call --session \
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--dest org.gnome.SettingsDaemon.Power \
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--object-path /org/gnome/SettingsDaemon/Power \
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--method org.freedesktop.DBus.Properties.Set \
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org.gnome.SettingsDaemon.Power.Screen Brightness '<30>'
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```
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## Using Applications to Provide Services
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