touch-packages team mailing list archive

[Kevin DuBois <kevin.dubois@xxxxxxxxxxxxx>]

So, what seems to be happening on these drivers is that the hotplug-
unplug event comes in while the driver is doing work in hwc::set() with
an external list. Since the driver cannot post the list to the display
anymore (as its physically disconnected), hwc::set() returns -1. At that
point, mir throws up the compositor thread (which is trying to be shut
down anyways at this point), and the exception is caught, which
terminates the server. Given that the thread that gets the throw is
shutting down anyways, we can ignore the exception.


** Branch linked: lp:~kdub/mir/fix-1474891

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https://bugs.launchpad.net/bugs/1474891

Title:
  USC crash on multimonitor unplug [std::exception::what: error during
  hwc prepare()]

Status in Mir:
  In Progress
Status in Unity System Compositor:
  New
Status in mir package in Ubuntu:
  New

Bug description:
  I've a slightly customized USC built in Silo0. On top of that, a multimonitor-aware unity8 is running.
  http://people.canonical.com/~platform/citrain_dashboard/#?q=ubuntu/landing-000

  On Android devices, Nexus 4 & 7, I occasionally get a crash on
  external monitor unplug. Here is the relevant log:

  ERROR: /build/mir-UAyS26/mir-0.13.4+15.04.20150709.2/src/platforms/android/server/real_hwc_wrapper.cpp(123): Throw in function virtual void mir::graphics::android::RealHwcWrapper::set(const std::array<hwc_display_contents_1*, 3u>&) const
  Dynamic exception type: N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE
  std::exception::what: error during hwc prepare(). rc = ffffffff

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