CFREG_MODE
mode = cfxga_read_1(sc, CFREG_MODE) & LCD_MODE_SWIVEL_BIT_0;
cfxga_write_1(sc, CFREG_MODE, mode | MODE_CRT);
cfxga_write_1(sc, CFREG_MODE, mode | MODE_NO_DISPLAY);
cfxga_write_1(sc, CFREG_MODE, 0); /* disable all displays */
cfxga_write_1(sc, CFREG_MODE, MODE_CRT);