From: Zhang Rui Date: Thu, 12 Mar 2009 08:57:11 +0000 (+0800) Subject: ACPI video: add a warning message if _BQC is not found X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=98758faffc86ee6fe9504eeab75481ee7c1aa860;p=linux-beck.git ACPI video: add a warning message if _BQC is not found ACPI backlight control w/o _BQC support is kinda firmware bug. Add a warning if _BQC is not implemented. Signed-off-by: Zhang Rui Signed-off-by: Len Brown --- 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; }