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If using the X server internal XRANDR 1.0 interface, it seems we must register a display size with RRRegisterSize() in order to make RRGetInfo() call RRScanOldConfig() to generate an output and crtc for us. Without this, the following GDM bug means that an XDMCP session to GDM cannot be started. https://bugzilla.gnome.org/show_bug.cgi?id=736054 Instead, use the more recent XRANDR 1.2 internal interface to explicitly create the output and crtc, and maintain a single mode which represents the current display size. Also don't emit a RRScreenSizeNotify when a RRScreenSizeSize is done which has no effect, this seems to throw the GDM greeter into a loop... v2: Maintain reference count for the mode we maintain more correctly, to avoid double free causing a crash on shutdown Connect crtc to output, so a subsequent RRSetCrtcConfig request doesn't change anything, so we don't fail due to our lack of rrSetConfig or rrCrtcSet hooks. See https://cygwin.com/ml/cygwin-xfree/2015-02/msg00032.html v3: Raise limit on X display size from 4Kx4K to 32Kx32K Signed-off-by: Jon Turney <jon.turney@dronecode.org.uk> Reviewed-by: Colin Harrison <colin.harrison@virgin.net>