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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

*** This bug is a duplicate of bug 1533140 ***
    https://bugs.launchpad.net/bugs/1533140

** Package changed: linux-lts-vivid (Ubuntu) => linuxmint

** This bug has been marked a duplicate of bug 1533140
   X recognises no screens when external connected

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https://bugs.launchpad.net/bugs/1533590

Title:
  X recognises no screens when external connected

Status in Linux Mint:
  New

Bug description:
  Note that I'm really running Mint 17.3; but I don't believe they
  change the kernel packages, so this is still relevant here.

  When an external screen is connected through the dock (both
  displayport and displayport-to-dvi, on different docks), I get a
  message during startup that the X server has not found any screens.

  Simply turning the screen off (not even disconnecting it) lets the
  system boot into the single laptop screen as per normal. When I turn
  on (or reconnect) the screen, it isn't recognised, and not even seen
  as far as syslog is concerned.

  When not docked, the onboard displayport connection works as normal.

  Yesterday everything was normal, the only relevant upgrade that
  happened was from kernel 3.16.0-38.52 to 3.19.0-32.37.

  I've rebooted into the previous kernel, and that works normally - so I
  suspect a regression in the i915 driver or similar?

  I'm also noticing these lines in there, that aren't shown with the old
  kernel:

      [ 8.553727] [drm:gen8_irq_handler [i915_bpo]] *ERROR* The master
  control interrupt lied (SDE)!

  Kernel 3.19 loads i915_bpo and spews the above errors; kernel 3.16
  uses i915 and does not. I cannot rmmod i915_bpo as it is in use even
  when no X is active; and simply loading i915 on top does not help.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.19.0-32-generic 3.19.0-32.37~14.04.1
  ProcVersionSignature: Ubuntu 3.19.0-32.37~14.04.1-generic 3.19.8-ckt7
  Uname: Linux 3.19.0-32-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  Date: Wed Jan 13 11:04:01 2016
  InstallationDate: Installed on 2015-09-22 (112 days ago)
  InstallationMedia: Linux Mint 17.2 "Rafaela" - Release amd64 20150723
  SourcePackage: linux-lts-vivid
  UpgradeStatus: No upgrade log present (probably fresh install)

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