>From da38c4f4decae22797aa39d5ac8518cada0302e3 Mon Sep 17 00:00:00 2001 From: Zhang Rui <rui.zhang@xxxxxxxxx> Date: Tue, 29 Nov 2016 16:13:56 +0800 Subject: [PATCH] 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: Zhang Rui <rui.zhang@xxxxxxxxx> --- drivers/acpi/scan.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c index 3d1856f..07aa2e6 100644 --- a/drivers/acpi/scan.c +++ b/drivers/acpi/scan.c @@ -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; } -- 2.7.4 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
