a5xelte: disable fingerprint sensor when screen is off

When the screen is off, the fingerprint sensor scans every second for
a finger which causes unwanted battery drain. Disabling the sensor
when the device is sleeping extends the standby time by a factor of
about 2-3x.
As the fingerprint reader is also the power button, this doesn't
hinder its usage.

Change-Id: I347f5b060723ca663c683786ea10c3efe8a18782
Ref: BUGBASH-1422

diff --git a/overlay/frameworks/base/packages/SystemUI/res/values/lineage_config.xml b/overlay/frameworks/base/packages/SystemUI/res/values/lineage_config.xml
new file mode 100644 (file)
index 0000000..4f2236e
--- /dev/null
+++ b/overlay/frameworks/base/packages/SystemUI/res/values/lineage_config.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+**
+** Copyright 2015 The Android Open Source Project
+**           2017 The LineageOS Project
+**
+** Licensed under the Apache License, Version 2.0 (the "License");
+** you may not use this file except in compliance with the License.
+** You may obtain a copy of the License at
+**
+**     http://www.apache.org/licenses/LICENSE-2.0
+**
+** Unless required by applicable law or agreed to in writing, software
+** distributed under the License is distributed on an "AS IS" BASIS,
+** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+** See the License for the specific language governing permissions and
+** limitations under the License.
+*/
+-->
+
+<!-- These resources are around just to allow their values to be customized -->
+<resources>
+
+    <!-- Disable listening for fingerprints when the screen is off.
+         This reduces battery drain significantly. -->
+    <bool name="config_fingerprintWakeAndUnlock">false</bool>
+
+</resources>