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| author | Zhang Rui <rui.zhang@intel.com> | 2009-03-12 16:57:11 +0800 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2009-03-27 22:37:22 -0400 |
| commit | 98758faffc86ee6fe9504eeab75481ee7c1aa860 (patch) | |
| tree | 8fe209e521f07b484b0b7de5e21b8babf1744f74 /drivers/acpi | |
| parent | 74a365b3f354fafc537efa5867deb7a9fadbfe27 (diff) | |
| download | linux-3.10-98758faffc86ee6fe9504eeab75481ee7c1aa860.tar.gz linux-3.10-98758faffc86ee6fe9504eeab75481ee7c1aa860.tar.bz2 linux-3.10-98758faffc86ee6fe9504eeab75481ee7c1aa860.zip | |
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.c | 3 |
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; } |