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Message-ID: <1319747904.1731.YahooMailNeo@web130113.mail.mud.yahoo.com>
Date:	Thu, 27 Oct 2011 13:38:24 -0700 (PDT)
From:	Alex Davis <alex14641@...oo.com>
To:	"wmkoolen@...ence.uva.nl" <wmkoolen@...ence.uva.nl>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [bisected] i915 dpms does not switch back light on



>I've been having this problem as well. I created a patch that fixes the problem for me and others:
>
>diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
>index 6f56676..a9e0c7b 100644
>--- a/drivers/gpu/drm/i915/intel_panel.c
>+++ b/drivers/gpu/drm/i915/intel_panel.c
>@@ -262,6 +262,8 @@ void intel_panel_disable_backlight(struct drm_device *dev)
>                dev_priv->backlight_level = intel_panel_get_backlight(dev);
>                dev_priv->backlight_enabled = false;
>        }
>+
>+       intel_panel_set_backlight(dev, 0);
> }
>

If the patch above doesn't work, try this one:

diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 6f56676..a9e0c7b 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -262,6 +262,8 @@ void intel_panel_disable_backlight(struct drm_device *dev)
                dev_priv->backlight_level = intel_panel_get_backlight(dev);
                dev_priv->backlight_enabled = false;
        }
+
+       intel_panel_set_backlight(dev, 0);
 }
 
 void intel_panel_enable_backlight(struct drm_device *dev)
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