[Bug 85861] backlight control doesn't work on Lenovo t440p after upgrading to 3.17 [bisected]

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=85861

--- Comment #9 from Jani Nikula <jani.nikula at intel.com> ---
Please try this patch:

diff --git a/drivers/gpu/drm/i915/intel_panel.c
b/drivers/gpu/drm/i915/intel_panel.c
index 18784470a760..443b62356e55 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -1103,8 +1103,7 @@ static u32 get_backlight_min_vbt(struct intel_connector
*connector)
     WARN_ON(panel->backlight.max == 0);

     /* vbt value is a coefficient in range [0..255] */
-    return scale(dev_priv->vbt.backlight.min_brightness, 0, 255,
-             0, panel->backlight.max);
+    return 0;
 }

 static int bdw_setup_backlight(struct intel_connector *connector)

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