[Bug 71101] Intel screen backlight control not working

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=71101

--- Comment #9 from Jani Nikula <jani.nikula at intel.com> ---
Please try these, separately:

1)
$ intel_reg_write 0xc8254 0x056c056c

2)
diff --git a/drivers/gpu/drm/i915/intel_panel.c
b/drivers/gpu/drm/i915/intel_panel.c
index 350de359123a..cc03c74c6f31 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -1165,7 +1165,7 @@ void intel_panel_init_backlight_funcs(struct drm_device
*dev)
 {
     struct drm_i915_private *dev_priv = dev->dev_private;

-    if (IS_BROADWELL(dev)) {
+    if (IS_BROADWELL(dev) || IS_HASWELL(dev)) {
         dev_priv->display.setup_backlight = bdw_setup_backlight;
         dev_priv->display.enable_backlight = bdw_enable_backlight;
         dev_priv->display.disable_backlight = pch_disable_backlight;

3) blacklist i915, attach reg dump *before* i915 has touched them.

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