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[Bug 1496069] Re: [usc] Mir gives up and shuts down due to input with multimonitor qtmir (std::exception::what: Failure sending input event)

 

This bug was fixed in the package mir - 0.17.0+15.10.20151008.2-0ubuntu1

---------------
mir (0.17.0+15.10.20151008.2-0ubuntu1) wily; urgency=medium

  [ Alexandros Frantzis ]
  * New upstream release 0.17.0 (https://launchpad.net/mir/+milestone/0.17.0)
    - ABI summary: Only servers and graphics drivers need rebuilding;
      . Mirclient ABI unchanged at 9
      . Mirserver ABI bumped to 35
      . Mircommon ABI unchanged at 5
      . Mirplatform ABI bumped to 11
      . Mirprotobuf ABI bumped to 3
      . Mirplatformgraphics ABI bumped to 6
      . Mirclientplatform ABI unchanged at 3
    - Enhancements:
      . Introduce libmircookie, a simple mechanism for a group of cooperating
        processes to hand out and verify difficult-to-forge timestamps to
        untrusted 3rd parties.
      . More refactorings to support renderers other than GL.
      . Add MirBlob to the client API - a tool for serializing and
        deserializing data.
      . Introduce a libinput based input platform, not yet used by default.
      . Provide a mechanism for the shell to send events on surface
        construction.
      . Provide mir::shell::DisplayConfigurationController allowing shells
        to correctly change the display configuration, notifying clients
        as appropriate.
      . New DSO versioning guide.
      . Send events pertaining to the output a surface is currently on (dpi,
        form factor, scale) to clients.
    - Bug fixes:
      . [enhancement] XMir specific documentation should live in its own
        subsection (LP: #1200114)
      . Nested servers need cursor support (LP: #1289072)
      . Mir cursor is missing/invisible until the client sets it multiple
        times (LP: #1308133)
      . [regression] Fullscreen software surfaces (like Xmir -sw) can crash
        the Mir server (LP: #1493721)
      . [usc] Mir gives up and shuts down due to input with multimonitor qtmir
        (std::exception::what: Failure sending input event) (LP: #1496069)
      . Mouse cursor disappears upon entering the surface area of a nested
        client (LP: #1496849)
      . [android] input is not dispatched when attaching an external monitor
        (LP: #1498045)
      . [android] input coordinates are scaled incorrectly when an external
        display is connected (LP: #1498540)
      . [android] std::exception::what: error during hwc set() when unplugging
        external monitor (LP: #1498550)
      . tests do not compile without precompiled headers (LP: #1498829)
      . [android] std::exception::what: Failed to monitor fd: Operation not
        permitted when unplugging external display in a nested configuration
        (LP: #1499042)
      . Mir suddenly no longer builds since 'mesa (11.0.0-1ubuntu1) wily':
        /usr/include/EGL/eglplatform.h:100:35: fatal error:
        android/native_window.h: No such file or directory (LP: #1499134)
      . [android] various crashes when unplugging external display on a
        nested configuration (LP: #1501927)
      . Cursor becomes visible by itself when an external monitor is connected
        (LP: #1502200)
      . mesa FTBFS due to missing Requires in mirclient (LP: #1503450)

  [ CI Train Bot ]
  * New rebuild forced.

 -- Alexandros Frantzis <alexandros.frantzis@xxxxxxxxxxxxx>  Thu, 08 Oct
2015 16:12:19 +0000

** Changed in: mir (Ubuntu)
       Status: Triaged => Fix Released

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https://bugs.launchpad.net/bugs/1496069

Title:
  [usc] Mir gives up and shuts down due to input with multimonitor qtmir
  (std::exception::what: Failure sending input event)

Status in Mir:
  Fix Released
Status in mir package in Ubuntu:
  Fix Released

Bug description:
  I'm implementing proper multimonitor support in QtMir in this branch:
  lp:~gerboland/qtmir/multimonitor/

  Please build & install on device. You don't need to change unity8. The
  immediate goal is for unity8 to remain on the tablet screen, and have
  nothing (well a black screen) drawn on the external monitor.

  This is mostly happening, but I'm experiencing problems related to
  input.

  Steps to repro:
  1. When you plug in the external monitor, nothing will appear on it (for later), but unity8 should still be interactive on the N7 
      - unity8 will flicker when the display config changes, due to it tearing down the old gl context and creating a new one.
      - unity8 is not getting any touch input events. I checked that USC is not sending it any. [1]
      - however the vol up/down key does cause the volume notification to appear.

  2. Now unplug the external monitor. 
      - *sometimes* unity8 works fine, gets input events again just fine and works great.
      - *sometimes* unity8 crashes as soon as you tap on the screen. It crashes because USC shuts down [2]! Relevant failure message:

  ERROR: /home/gerry/dev/projects/mir/mir-0.15/src/server/input/android/input_sender.cpp(218): Throw in function void mir::input::android::InputSender::ActiveTransfer::send(mir::input::android::InputSendEntry&&)
  Dynamic exception type: N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE
  std::exception::what: Failure sending input event : 
  9, "Bad file descriptor"

  Something gone screwy with input then.

  
  Perhaps QtMir needs to do something special to its input receiver when the multimonitor situation changes and its surface is destroyed & recreated??
  Guidance appreciated
  -G


  [1] http://pastebin.ubuntu.com/12418660/ - is USC log with input reporting enabled. Started with 1 monitor, then was 2, then 1 again. Observe while in multimonitor case, no input events are "Published" and "Received"
  [2] http://pastebin.ubuntu.com/12419006/ - USC backtrace when it shuts down

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