[arale] hardare button interferes with proximity sensor during calls

[Jean-Baptiste Lallement]

current build number: 299
device name: arale
channel: ubuntu-touch/rc-proposed/meizu.en

Test Case
1. Make a call to DUT
2. Answer the call
3. Cover the proximity sensor and verify that the display turns off
4. Cover the hardware button

Actual Result
Display turns on even if the proximity sensor is covered

Expected Result
Display must not turn on, otherwise the user may start tapping the screen with his ears.

[kevin gunn (kgunn72)]

isn't this effectively a dup of bug 1549701 &/or bug 1565818

[Michał Sawicz (saviq)]

Kinda, I think the issue here is the code that wakes the screen up on key events - it might be fighting with proximity sensor.

Should be easy to verify with a BT keyboard during a call - just press any key when the proximity sensor is covered.

[Michael Terry (mterry)]

Yup Saviq, that's exactly right. I just tested with a BT keyboard. I pressed a key and the screen turned back on.

[Michael Terry (mterry)]

Looking at code real quick, looks like this is entirely inside of USC then. It handles turning on the screen on a key press and knows about proximity status.