DRM_SCANOUTPOS_IN_VBLANK  572 drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h #define DRM_SCANOUTPOS_IN_VBLANK    (1 << 1)
DRM_SCANOUTPOS_IN_VBLANK  689 drivers/gpu/drm/radeon/radeon_mode.h #define DRM_SCANOUTPOS_IN_VBLANK    (1 << 1)