Syncing task from Mir.

** Changed in: mir (Ubuntu)
   Importance: Undecided => Wishlist

** Changed in: mir (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1672717

Title:
  Mir-on-X rendering is corrupt for dual GPU systems

Status in Mir:
  Confirmed
Status in mir package in Ubuntu:
  Confirmed

Bug description:
  Running mir-on-x mir_demo_server results in corruption when running
  mir_demo_client_egl_triangle. Image of corruption attached.

  Startup log:
  [2017-03-14 09:08:11.917539] x11-display: Screen resolution = 1920x1080
  [2017-03-14 09:08:11.917564] x11-display:  ... is smaller than the requested 
size (1280x1024) plus border (150). Clipping to (1770x930).
  [2017-03-14 09:08:11.922752] x11-display: 1 visual(s) found
  [2017-03-14 09:08:11.922763] x11-display: Using the first one :
  [2017-03-14 09:08:11.922777] x11-display: ID          :       33
  [2017-03-14 09:08:11.922780] x11-display: screen      :       0
  [2017-03-14 09:08:11.922784] x11-display: depth               :       24
  [2017-03-14 09:08:11.922787] x11-display: red_mask    :       0xFF0000
  [2017-03-14 09:08:11.922790] x11-display: green_mask  :       0xFF00
  [2017-03-14 09:08:11.922805] x11-display: blue_mask   :       0xFF
  [2017-03-14 09:08:11.922809] x11-display: colormap_size       :       256
  [2017-03-14 09:08:11.922812] x11-display: bits_per_rgb        :       8
  [2017-03-14 09:08:12.074043] mirserver: Using software cursor
  [2017-03-14 09:08:12.115520] mirserver: Selected input driver: mir:x11-input 
(version: 0.27.0)
  [2017-03-14 09:08:12.124136] mirserver: Mir version 0.27.0
  [2017-03-14 09:08:12.131270] GLRenderer: EGL vendor: Mesa Project
  [2017-03-14 09:08:12.131304] GLRenderer: EGL version: 1.4 (DRI2)
  [2017-03-14 09:08:12.131307] GLRenderer: EGL client APIs: OpenGL OpenGL_ES 
  [2017-03-14 09:08:12.131313] GLRenderer: GL vendor: Intel Open Source 
Technology Center
  [2017-03-14 09:08:12.131329] GLRenderer: GL renderer: Mesa DRI Intel(R) 
Haswell Mobile 
  [2017-03-14 09:08:12.131332] GLRenderer: GL version: OpenGL ES 3.1 Mesa 13.0.4
  [2017-03-14 09:08:12.131335] GLRenderer: GLSL version: OpenGL ES GLSL ES 3.10
  [2017-03-14 09:08:12.131342] GLRenderer: GL max texture size = 16384
  [2017-03-14 09:08:12.132097] GLRenderer: GL framebuffer bits: RGBA=8888, 
depth=0, stencil=0
  [2017-03-14 09:08:12.154863] mirserver: Initial display configuration:
  [2017-03-14 09:08:12.154915] mirserver:   Output 1: unknown connected, used
  [2017-03-14 09:08:12.154932] mirserver:       Physical size 20.8" 468x245mm
  [2017-03-14 09:08:12.154939] mirserver:       Power is on
  [2017-03-14 09:08:12.154946] mirserver:       Current mode 1770x930 60.00Hz
  [2017-03-14 09:08:12.154956] mirserver:       Preferred mode 1770x930 60.00Hz
  [2017-03-14 09:08:12.154963] mirserver:       Orientation normal
  [2017-03-14 09:08:12.154975] mirserver:       Logical size 1770x930
  [2017-03-14 09:08:12.154980] mirserver:       Logical position +0+0
  [2017-03-14 09:08:12.154986] mirserver:       Scaling factor: 1.00

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