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ACPI video: add a warning message if _BQC is not found

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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>
This commit is contained in:
Zhang Rui 2009-03-12 16:57:11 +08:00 committed by Len Brown
parent 74a365b3f3
commit 98758faffc
1 changed files with 3 additions and 0 deletions
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3
drivers/acpi/video_detect.c
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@ -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;
}