OK I get what the problem is: it's the proximity sensor. I have a flip- case for my phone that covers the proximity sensor. If the flip-case is closed the phone thinks it's next to my ear and switches off the screen.
So there are two things wrong here. First (IMO) it doesn't make sense to use the proximity sensor to control the screen when the phone call hasn't been answered yet. Second, the phone should at least switch the screen on when I open the flip case, but it doesn't. I tested it with four phone calls just now: 1) Flip-case closed. Didn't switch on screen. 2) Flip-case open. Screen turned on fine 3) Flip-case closed, then opened once it started ringing. Still didn't switch on screen. 4) Flip-case open. Screen turned on fine. syslog attached. ** Attachment added: "syslog.gz" https://bugs.launchpad.net/canonical-devices-system-image/+bug/1524648/+attachment/4535610/+files/syslog.gz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1524648 Title: Display doesn't turn on for incoming phone call To manage notifications about this bug go to: https://bugs.launchpad.net/canonical-devices-system-image/+bug/1524648/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs