I built touch-debug packages of unity8 to get as much output as possible for this.
Interesting data point: playing music seems to trigger this more often - suspicion is not allowing the device to fully suspend increases the chance to get this bug. To get the debug-enabled unity8: $ wget http://people.canonical.com/~msawicz/unity8/touch-debug/repo-key.pub $ gpg --home-dir /dev/null --with-fingerprint repo-key.pub # verify fingerprint: C09A 0EA9 555F 5A80 D53B EE1F 47EA 8F76 B005 9747 $ sudo apt-key add repo-key.pub $ sudo apt update $ sudo apt install unity8 unity8-common unity8-private $ sudo reboot -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to unity8 in Ubuntu. https://bugs.launchpad.net/bugs/1408263 Title: Edge gestures still get lost Status in unity8 package in Ubuntu: In Progress Bug description: There are still cases where edge gestures are lost. Over the christmas holidays It happened about 5 times to me (in 2 weeks). Only way to recover is to reboot the phone. It always happened while the phone was in my pocket. When pulling it out of the pocket the edge gestures (launcher and right edge) were gone. This is most likely related to random taps on the screen, maybe in combination with the display toggling on/off. Haven't found a way yet to manually trigger it. Will keep on trying. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1408263/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp