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    SubjectRe: Regression: i915 blank issue on kernel 3.1.0-rc3
    .From: Keith Packard <keithp@keithp.com>
    >> The following patch fixed my backlight issues:
    >>
    >> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
    >> index a9e0c7b..6f56676 100644
    >> --- a/drivers/gpu/drm/i915/intel_panel.c
    >> +++ b/drivers/gpu/drm/i915/intel_panel.c
    >> @@ -262,8 +262,6 @@ 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)
    >>
    >> I've been using it since yesterday morning with no issues.
    >
    >Matthew -- if we cannot resolve this backlight issue, we're going to
    >need to disable the new backlight code for 3.1. Do you want to try and
    >fix it? Or should we bail for now?

    By 'disable', do you mean revert? If so, I would the like chance to submit a patch that adds a boot parameter
    for the driver to disable the backlight by default, e.g: i915_disable_bl. Once the issues are sorted, the
    parameter could be removed.
    --
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