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authorZhang Rui <rui.zhang@intel.com>2009-03-12 16:57:11 +0800
committerLen Brown <len.brown@intel.com>2009-03-27 22:37:22 -0400
commit98758faffc86ee6fe9504eeab75481ee7c1aa860 (patch)
tree8fe209e521f07b484b0b7de5e21b8babf1744f74 /drivers/acpi
parent74a365b3f354fafc537efa5867deb7a9fadbfe27 (diff)
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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 <rui.zhang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
Diffstat (limited to 'drivers/acpi')
-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 50e3d2dbf3a..09737275e25 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;
}