gfxp_fb_detach
extern int gfxp_fb_detach(dev_info_t *devi, ddi_detach_cmd_t cmd,
(void) gfxp_fb_detach(devi, DDI_DETACH, (void *)softc);
(void) gfxp_fb_detach(devi, cmd, softc->gfxp_state);
return (gfxp_fb_detach(devi, cmd, softc->gfxp_state));