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[Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>]

It's in Linus's tree:

commit b708a1d5ea7880b399dbd45cacafff6ae8d73171
Author: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Date:   Mon Jun 11 14:39:56 2012 -0400

    drm/i915: don't enumerate HDMID if an eDP panel is already active on
the por

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https://bugs.launchpad.net/bugs/800226

Title:
  [Sandybridge GT1] No display on dell all-in-one

Status in The Linux Kernel:
  Fix Released
Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Precise:
  Fix Released

Bug description:
  -- CPU: Intel Core(TM) i3-2100 CPU @ 3.10GHz (Sandy Bridge)
  -- GPU: Intel Corporation Sandy Bridge Integrated Graphics Controller
  [8086:0102] (rev 09) (prog-if 00 [VGA controller])
  -- system architecture: 32-bit
  -- Linux distribution: Ubuntu 10.10 and 11.04
  -- Package versions:
     libdrm - 2.4.21-1ubuntu2 and 2.4.23-1ubuntu6
     xf86-video-intel - 2:2.12.0-1ubuntu5.2 and 2:2.14.0-4ubuntu7
     kernel - 2.6.35-24.42-generic (2.6.35.8) through 2.6.39.1


  This system is a desktop one with a eDP->LVDS converter (CH7511B) for the
  all-in-one panel and it only works with VESA. As soon as KMS kicks in it goes
  black and doesn't come back. External monitors still work fine, its just the
  internal panel that is black. Ubuntu maverick and natty were tested, as well as
  a 2.6.39.1 kernel. the 2.6.39.1 kernel actually hung with an external monitor,
  with additional messages like these at the end

  PCH HDCP audio interrupt

  Followed by a two additional DRM messages:

  <7> [ 17.668935 ] [drm.ironlake_dp_detect], DPCD: 0000
  <7> [ 245.874118] [drm:i915_hotplug_work_func], running encoder hotplug
  functions

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