superuser shell block works fine
05-12 10:16:59.819 I 5@1: Flow beginning
05-12 10:16:59.819 I 5@2: System setting set
05-12 10:16:59.820 F 5@2: android.os.RemoteException: Remote stack trace:
at com.android.providers.settings.SettingsProvider.enforceWritePermission(SettingsProvider.java:2261)
at com.android.providers.settings.SettingsProvider.mutateSecureSetting(SettingsProvider.java:1733)
at com.android.providers.settings.SettingsProvider.insertSecureSetting(SettingsProvider.java:1684)
at com.android.providers.settings.SettingsProvider.call(SettingsProvider.java:460)
at android.content.ContentProvider.call(ContentProvider.java:2511)
05-12 10:16:59.820 I 5@2: Stopped by failure