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drm_queue_handler just puts the event on the signalled list; without calling drm_queue_handle_deferred, actual processing of the event may be delayed indefinitely, e.g. until another event arrives from the kernel. This could result in DRI2 clients hanging during DPMS off. Fixes: 739181c8 "Add amdgpu_drm_handle_event wrapper for drmHandleEvent" Reviewed-by: Aaron Liu <aaron.liu@amd.com> Tested-by: Aaron Liu <aaron.liu@amd.com>
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