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Commit 98758faf authored by Zhang Rui's avatar Zhang Rui Committed by Len Brown
Browse files

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: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 74a365b3

drivers/acpi/video_detect.c

+3 −0
Original line number Diff line number Diff line
@@ -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;

	}