acpi_backlight_undef 47 drivers/acpi/video_detect.c static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef; acpi_backlight_undef 48 drivers/acpi/video_detect.c static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef; acpi_backlight_undef 421 drivers/acpi/video_detect.c if (acpi_backlight_cmdline != acpi_backlight_undef) acpi_backlight_undef 424 drivers/acpi/video_detect.c if (acpi_backlight_dmi != acpi_backlight_undef)