ACPI: do not warn if _BQC does not exist

From: Zhang Rui <[email protected]>
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.

---
 drivers/acpi/scan.c | 3 ---

 1 file changed, 3 deletions(-)

index 3d1856f..07aa2e6 100644
@@ -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

Applied.

Thanks,
Rafael