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-rw-r--r--drivers/acpi/video_detect.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 50e3d2dbf3af..09737275e25f 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -55,6 +55,9 @@ acpi_backlight_cap_match(acpi_handle handle, u32 level, void *context,
ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Found generic backlight "
"support\n"));
*cap |= ACPI_VIDEO_BACKLIGHT;
+ if (ACPI_FAILURE(acpi_get_handle(handle, "_BQC", &h_dummy)))
+ printk(KERN_WARNING FW_BUG PREFIX "ACPI brightness "
+ "control misses _BQC function\n");
/* We have backlight support, no need to scan further */
return AE_CTRL_TERMINATE;
}