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Currently, Xwayland uses libxcvt to generate the mode info and then passes that to RRModeGet() to generate a RRMode. However, libxcvt may round down the width to match the horizontal granularity (8), and that's a problem when the Wayland compositor is running a non-standard size (like, e.g. running nested with a custom size) because XRandR would report a width smaller than the actual size. To avoid that, check whether the CVT computed size differs from the expected size, and fallback to a simpler computation not doing any rounding if that's the case. Signed-off-by: Olivier Fourdan <ofourdan@redhat.com> Closes: https://gitlab.freedesktop.org/xorg/xserver/-/issues/1540 Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>