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Commit 7020bcb8 authored by Zhang Rui's avatar Zhang Rui Committed by Rafael J. Wysocki
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ACPI: do not warn if _BQC does not exist 



Starting from ACPI spec 3.0, it's only clarified that _BCM control
method is required if _BCL is implemented. There is no word
saying _BQC is required.

And in ACPI spec 6.1 B.5.4, for _BQC, it is explicitly stated that
"This optional method returns the current brightness level of a
built-in display output device. If present, it must be set by
the platform for initial brightness."

Thus remove the obsolete warning message.

Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent e5517c2a

drivers/acpi/scan.c

+0 −3
Original line number Diff line number Diff line
@@ -1119,9 +1119,6 @@ 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_has_method(handle, "_BQC"))

			printk(KERN_WARNING FW_BUG PREFIX "No _BQC method, "

				"cannot determine initial brightness\n");

		/* We have backlight support, no need to scan further */

		return AE_CTRL_TERMINATE;

	}