restore the fbdev state if a drm app like X is killed.
Tested-by: NMichel Dänzer <michel.daenzer@amd.com>
Reviewed-by: NMichel Dänzer <michel.daenzer@amd.com>
Reviewed-by: NChristian König <christian.koenig@amd.com>
Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>