losing touches in arale when home button is pressed

[Daniel d'Andrada]

Might be a bug in arale's drivers, but worth checking mir first.

Image: vivid-proposed #155

Steps to reproduce:
1 - lay one finger on the screen and start moving it (do *not* lift it)
2 - while step 1 is ongoing, tap the home button with another finger a couple of times

Expected outcome:
touch events from step 1 keep coming as long as your finger is moving

Actual outcome:
Eventually you stop receiving touch events from step 1. If you lift your finger and tap on the screen you will get a touch-pressed with a new id. So you will never even get a touch-release for the finger from step 1.

[kevin gunn (kgunn72)]

alf offered to take a look tomorrow
btw, dandrader saying he's just heavily crippled by this issue, not necessarily dead in the water

[Alexandros Frantzis (afrantzis)]

This behavior seems to be caused by an optimization present in the Android input stack, which is supposed to reduce the latency of handling certain "app switching" keys like "Home".

As a quick fix, the attached patch disables the optimization, but we should investigate if/how we can make use of it with our usage scenarios (esp. if we actually enable a home button in a device).

[Daniel d'Andrada (dandrader)]

I confirm the patch does fix the bug. Excellent work!

[PS Jenkins bot (ps-jenkins)]

Fix committed into lp:mir at revision None, scheduled for release in mir, milestone 0.13.0

[Ubuntu Foundations Team Bug Bot (crichton)]

The attachment "Proposed fix for lost input events with home button" seems to be a patch. If it isn't, please remove the "patch" flag from the attachment, remove the "patch" tag, and if you are a member of the ~ubuntu-reviewers, unsubscribe the team.

[This is an automated message performed by a Launchpad user owned by ~brian-murray, for any issues please contact him.]

[Launchpad Janitor (janitor)]

This bug was fixed in the package mir - 0.13.1+15.10.20150520-0ubuntu1

---------------
mir (0.13.1+15.10.20150520-0ubuntu1) wily; urgency=medium

  [ Cemil Azizoglu ]
  * New upstream release 0.13.1 (https://launchpad.net/mir/+milestone/0.13.1)
    - ABI summary: No ABI break. Servers and clients do not need rebuilding.
      . Mirclient ABI unchanged at 8
      . Mircommon ABI unchanged at 4
      . Mirplatform ABI unchanged at 7
      . Mirserver ABI unchanged at 31
    - Bug fixes:
      . Can't load app purchase UI without a U1 account (LP: #1450377)
      . Crash because uncaught exception in mir::events::add_touch (LP: #1437357)

 -- CI Train Bot <email address hidden> Wed, 20 May 2015 21:20:15 +0000