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The correct way for legacy drivers to update properties that need to do a full modeset, is to do a full modeset. Note that we don't need to call the drm_mode_config_internal helper because we're not changing any of the refcounted paramters. v2: Fixup error handling (Ville). Since the old code didn't bother I decided to just delete it instead of adding even more code for just error handling. Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com> (v1) Signed-off-by: Daniel Vetter <daniel.vetter@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181217194303.14397-1-daniel.vetter@ffwll.ch