Signed-off-by: Thomas Renninger <trenn@xxxxxxx>
---
drivers/misc/sony-laptop.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/drivers/misc/sony-laptop.c b/drivers/misc/sony-laptop.c
index 60775be..3d178ab 100644
--- a/drivers/misc/sony-laptop.c
+++ b/drivers/misc/sony-laptop.c
@@ -1038,7 +1038,11 @@ static int sony_nc_add(struct acpi_device *device)
goto outinput;
}
- if (ACPI_SUCCESS(acpi_get_handle(sony_nc_acpi_handle, "GBRT", &handle))) {
+ if (!acpi_video_backlight_support()) {
+ printk(KERN_INFO DRV_PFX "Sony: Brightness ignored, must be "
+ "controlled by ACPI video driver\n");
+ } else if (ACPI_SUCCESS(acpi_get_handle(sony_nc_acpi_handle, "GBRT",
+ &handle))) {
sony_backlight_device = backlight_device_register("sony", NULL,
NULL,
&sony_backlight_ops);
--
1.5.4.5
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