case HWC_DISPLAY_PRIMARY:
	    ALOGD("%s: %s display: HWC_DISPLAY_PRIMARY", __FUNCTION__,
	          blank==1 ? "Blanking":"Unblanking");
            if(blank) {
// guhl disable vsync here
	        int vsync_enable;
	        vsync_enable = ctx->vstate.enable;
	        ALOGD ("GUHL: VSYNC vsync_enable = %d", vsync_enable);
	        int enable;
	        enable = false;
	        if(vsync_enable){
		    ret = hwc_vsync_control(ctx, dpy, enable);
		    if(ret == 0) {
			ctx->vstate.enable = !!enable;
			pthread_cond_signal(&ctx->vstate.cond);
		    }
	        }
	        ALOGD ("GUHL: VSYNC state changed to %s", (enable)?"ENABLED":"DISABLED");
// guhl end
                ret = ioctl(ctx->dpyAttr[dpy].fd, FBIOBLANK,FB_BLANK_POWERDOWN);