atombios_enable_crtc_memreq(crtc, ATOM_ENABLE);
atombios_blank_crtc(crtc, ATOM_DISABLE);
drm_vblank_post_modeset(dev, radeon_crtc->crtc_id);
atombios_enable_crtc_memreq(crtc, ATOM_ENABLE);
atombios_blank_crtc(crtc, ATOM_DISABLE);
drm_vblank_post_modeset(dev, radeon_crtc->crtc_id);