acpi_video_brightness_set
if (acpi_video_brightness_set(vidbp,
if (acpi_video_brightness_set(vidbp,
if (acpi_video_brightness_set(vidbp, 0) != ACPI_DRV_OK) {
if (acpi_video_brightness_set(vidbp,
if (acpi_video_brightness_set(vidbp,
if (acpi_video_brightness_set(vidbp, level) != ACPI_DRV_OK) {