[Bug 84974] [VLV bisected] LVDS/powerdomains: Screen goes blank on rotate using xrandr

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84974

--- Comment #26 from Jani Nikula <jani.nikula at intel.com> ---
Presuming the log from comment #22 is with just the eDP->LVDS output, the VBT
on the thing doesn't indicate that port C is eDP. What if you try this hack
patch:

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 6421593d95de..e5ab5f2ee879 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4527,7 +4527,7 @@ bool intel_dp_is_edp(struct drm_device *dev, enum port
port)
         [PORT_D] = PORT_IDPD,
     };

-    if (port == PORT_A)
+    if (port == PORT_C)
         return true;

     if (!dev_priv->vbt.child_dev_num)

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