~⟫ mir_demo_server --arw-file
[2017-03-21 14:06:25.747270] mirplatform: Found graphics driver: mir:mesa-kms (version 0.26.1)
[2017-03-21 14:06:25.749924] mirplatform: Found graphics driver: mir:mesa-x11 (version 0.26.1)
[2017-03-21 14:06:25.752822] mirserver: Starting
[2017-03-21 14:06:25.753638] mircommon: Loading modules from: /usr/lib/x86_64-linux-gnu/mir/server-platform
[2017-03-21 14:06:25.753746] mircommon: Loading module: /usr/lib/x86_64-linux-gnu/mir/server-platform/graphics-mesa-kms.so.12
[2017-03-21 14:06:25.754442] mircommon: Loading module: /usr/lib/x86_64-linux-gnu/mir/server-platform/server-mesa-x11.so.12
[2017-03-21 14:06:25.754486] mircommon: Loading module: /usr/lib/x86_64-linux-gnu/mir/server-platform/input-evdev.so.6
[2017-03-21 14:06:25.757079] mirplatform: Found graphics driver: mir:mesa-kms (version 0.26.1)
[2017-03-21 14:06:25.759048] mirplatform: Found graphics driver: mir:mesa-x11 (version 0.26.1)
[2017-03-21 14:06:25.759407] mirserver: Selected driver: mir:mesa-x11 (version 0.26.1)
[2017-03-21 14:06:25.893514] x11-display: Screen resolution = 1366x768
[2017-03-21 14:06:25.893620] x11-display:  ... is smaller than the requested size (1280x1024) plus border (150). Clipping to (1216x618).
ERROR: Cannot create report: [Errno 17] File exists: '/var/crash/_usr_bin_mir_demo_server.1000.crash'
ERROR: /build/mir-sajBv9/mir-0.26.1+16.04.20170209.1/src/platforms/mesa/server/x11/graphics/egl_helper.cpp(155): Throw in function void mir::graphics::X::helpers::EGLHelper::setup_internal(Display*, bool)
Dynamic exception type: boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<std::system_error> >
std::exception::what: Failed to get EGL display: EGL_BAD_PARAMETER (0x300c)