[15/87] drm/i915: Fix calculation of backlight value in combined mode

From: Greg KH
Date: Mon Mar 21 2011 - 19:50:03 EST

2.6.37-stable review patch. If anyone has any objections, please let us know.


From: Takashi Iwai <tiwai@xxxxxxx>

commit ba3820ade317ee36e496b9b40d2ec3987dd4aef0 upstream.

[The upstream commit above is a combination of revert + one-liner fix.
This patch contains only the latter that is needed for 2.6.37.x.]

This patch fixes the backlight level calculation for combination mode
used in some models like GM45. It's due to a wrong bit shift
introduced by the commit a95735569312f2ab0c80425e2cd1e5cb0b4e1870
drm/i915: Refactor panel backlight controls

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=23472
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=34524
Bugzilla: https://bugzilla.novell.com/show_bug.cgi?id=672946

Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
drivers/gpu/drm/i915/intel_panel.c | 1 -
1 file changed, 1 deletion(-)

--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -176,7 +176,6 @@ u32 intel_panel_get_backlight(struct drm
val &= ~1;
pci_read_config_byte(dev->pdev, PCI_LBPC, &lbpc);
val *= lbpc;
- val >>= 1;

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