Patch to fix backlight on GM45

From: Peter Clifton <pcjc2@cam.ac.uk>
To: Intel <intel-gfx@lists.freedesktop.org>
Subject: Patch to fix backlight on GM45
Date: Fri, 28 Jan 2011 22:13:08 +0000	[thread overview]
Message-ID: <1296252789.2154.9.camel@localhost> (raw)


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Without this, querying the backlight value returns half of the value it
has been set to. Hilarity ensues, as my user-space likes to query first
before incrementing / decrementing brightness, leading to brightness
collapsing to near as I try to adjust.

-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)
Tel: +44 (0)1223 748328 - (Shared lab phone, ask for me)

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From db647ad5ff5ce80e1a515411db7e4c6587c7e798 Mon Sep 17 00:00:00 2001
From: Peter Clifton <pcjc2@cam.ac.uk>
Date: Fri, 28 Jan 2011 22:08:40 +0000
Subject: [PATCH] drm/intel: Fix brightness value query when in combination mode

---
 drivers/gpu/drm/i915/intel_panel.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 4ab4239..1795823 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -208,7 +208,6 @@ u32 intel_panel_get_backlight(struct drm_device *dev)
 			val &= ~1;
 			pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
 			val *= lbpc;
-			val >>= 1;
 		}
 	}
 
-- 
1.7.2.3


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