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[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

Confirmed even with trunk Xmir... Although Xmir doesn't crash it does
show errors with Chromium:

Focus: unfocused
chromium-browser --type=gpu-process --channel=29964.0.243176076 --v8-natives-passed-by-fd --v8-snapshot-passed-by-fd --supports-dual-gpus=false --gpu-driver-bug-workarounds=2,15,44,56 --disable-accelerated-video-decode --gpu-vendor-id=0x8086 --gpu-device-id=0x0412 --gpu-driver-vendor --gpu-driver-version --v8-natives-passed-by-fd --v8-snapshot-passed-by-: Could not find mir surface for swapping!
[DRI2] DRI2SwapBuffers: driver failed to schedule swap

Looks like maybe Chromium is confused and trying to speak native Mir and
X/GLX simultaneously..?

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Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1420959

Title:
  Xmir (DRI2 mode) crashes when launching chromium

Status in xorg-server package in Ubuntu:
  Confirmed

Bug description:
  I've installed xserver-xorg-xmir, unity8-desktop-session-mir, and set
  my lightdm seat type to "unity".  Using normal everyday unity-greeter
  and unity7 session with xmir, most things work well.

  The one thing that doesn't is trying to launch chromium.  Doing so
  takes down the xmir session entirely.  Looking at the log file, I see:

  (==) Log file: "/var/log/Xorg.0.log", Time: Wed Feb 11 15:23:28 2015
  (==) Using system config directory "/usr/share/X11/xorg.conf.d"
  Driver needs flags 0, incompatible with nested, deleting.
  Driver needs flags 0, incompatible with nested, deleting.
  Driver needs flags 1, incompatible with nested, deleting.
  (EE) 
  (EE) Backtrace:
  (EE) 0: /usr/bin/X (xorg_backtrace+0x56) [0x7fd0feaa7806]
  (EE) 1: /usr/bin/X (0x7fd0fe8f0000+0x1bb9e9) [0x7fd0feaab9e9]
  (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fd0fc5c5000+0x36eb0) [0x7fd0fc5fbeb0]
  (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fd0f6544000+0x6ea04) [0x7fd0f65b2a04]
  (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fd0f6544000+0x10d280) [0x7fd0f6651280]
  (EE) 5: /usr/bin/X (0x7fd0fe8f0000+0x186edc) [0x7fd0fea76edc]
  (EE) 6: /usr/bin/X (DRI2CopyRegion+0x8b) [0x7fd0fea7786b]
  (EE) 7: /usr/bin/X (0x7fd0fe8f0000+0x189b53) [0x7fd0fea79b53]
  (EE) 8: /usr/bin/X (0x7fd0fe8f0000+0x57257) [0x7fd0fe947257]
  (EE) 9: /usr/bin/X (0x7fd0fe8f0000+0x5b466) [0x7fd0fe94b466]
  (EE) 10: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5) [0x7fd0fc5e6ec5]
  (EE) 11: /usr/bin/X (0x7fd0fe8f0000+0x4577e) [0x7fd0fe93577e]
  (EE) 
  (EE) Segmentation fault at address 0xffffffffffffff00
  (EE) 
  Fatal server error:
  (EE) Caught signal 11 (Segmentation fault). Server aborting
  (EE) 
  (EE) 
  Please consult the The X.Org Foundation support 
  	 at http://wiki.x.org
   for help. 
  (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
  (EE) 
  (II) AIGLX: Suspending AIGLX clients for VT switch
  (EE) Server terminated with error (1). Closing log file.

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