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[Kevin DuBois <kevin.dubois@xxxxxxxxxxxxx>]

fix checked on the n10, still need confirmation on the n5. Regression
came in rev 1767 and caused the error from the drivers (which was
previously ignored) to generate an exception on startup.

** Changed in: mir/0.5
     Assignee: (unassigned) => Kevin DuBois (kdub)

** Changed in: mir/0.5
       Status: New => In Progress

** Branch linked: lp:~mir-team/mir/fix-1345533-0.5

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https://bugs.launchpad.net/bugs/1345533

Title:
  [regression][hammerhead] Mir fails to start on Nexus 5 as it fails to
  turn vsync signal on

Status in Mir:
  In Progress
Status in Mir 0.5 series:
  In Progress
Status in “mir” package in Ubuntu:
  New

Bug description:
  Starting from image 137, with mir 0.5, Mir fails to start on Nexus 5
  (hammerhead), as it fails to turn the vsync signal on.

  This is what I get from logcat:

  D/libEGL  ( 3038): loaded /vendor/lib/egl/libEGL_adreno.so
  D/libEGL  ( 3038): loaded /vendor/lib/egl/libGLESv1_CM_adreno.so
  D/libEGL  ( 3038): loaded /vendor/lib/egl/libGLESv2_adreno.so
  I/qdutils ( 3038): Right Split=0
  D/qdhwcomposer( 3038): int qhwc::adRead(): /sys/class/graphics/fb2/ad could not be opened : No such file or directory
  I/qdhwcomposer( 3038): Initializing Qualcomm Hardware Composer
  I/qdhwcomposer( 3038): MDP version: 500
  I/Adreno-EGL( 3038): <qeglDrvAPI_eglInitialize:320>: EGL 1.4 QUALCOMM Build: I0404c4692afb8623f95c43aeb6d5e13ed4b30ddbDate: 11/06/13
  D/qdhwcomposer( 3038): hwc_getDisplayAttributes disp = 0, width = 1080
  D/qdhwcomposer( 3038): hwc_getDisplayAttributes disp = 0, height = 1920
  I/Adreno-EGL( 3038): <qeglDrvAPI_eglInitialize:320>: EGL 1.4 QUALCOMM Build: I0404c4692afb8623f95c43aeb6d5e13ed4b30ddbDate: 11/06/13
  I/qdhwcomposer( 3038): hwc_registerProcs
  I/qdhwcomposer( 3038): Initializing UEVENT Thread
  I/qdhwcomposer( 3038): Initializing VSYNC Thread
  I/qdhwcomposer( 3038): vsync_loop: Reading vsync for dpy=0 from /sys/class/graphics/fb0/vsync_event
  I/qdhwcomposer( 3038): vsync_loop: Reading vsync for dpy=1 from /sys/class/graphics/fb1/vsync_event
  D/qdhwcomposer( 3038): hwc_blank: Unblanking display: 0
  D/qdhwcomposer( 3038): hwc_blank: Done unblanking display: 0
  E/qdhwcomposer( 3038): hwc_vsync_control: vsync control failed. Dpy=0, enable=1 : Operation not supported
  W/libEGL  ( 3038): eglTerminate() called w/ 1 objects remaining
  E/libEGL  ( 3038): validate_display:263 error 3001 (EGL_NOT_INITIALIZED)
  I/ServiceManager(  913): service 'display.qservice' died

  The vsync control failed message was always there, and Mir 0.4 worked
  fine with it still.

  System compositor log:
  root@ubuntu-phablet:/var/log/lightdm# cat unity-system-compositor.log
  ERROR: /build/buildd/mir-0.5.0+14.10.20140717/src/platform/graphics/android/real_hwc_wrapper.cpp(75): Throw in function virtual void mir::graphics::android::RealHwcWrapper::vsync_signal_on() const
  Dynamic exception type: N5boost16exception_detail10clone_implINS0_19error_info_injectorISt13runtime_errorEEEE
  std::exception::what: error turning vsync signal on. rc = ffffffa1

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