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[Rodrigo-vivi <1194934@xxxxxxxxxxxxxxxxxx>]

After various hotplug fixes and rework that are landing on 3.11 this bug isn't reproducible with new kernels and production machines.
One thing it is worthful to try it the Takashi fix:

"In i915_drm_freeze(), dev_priv->enable_hotplug_processing must be set to false
before calling intel_modeset_disable().  (And better to cancel the pending,
too.)  Otherwise you'll get spurious hotplug events"

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https://bugs.launchpad.net/bugs/1194934

Title:
  eDP powered off while attempting aux channel communication

Status in intel:
  New
Status in The Linux Kernel:
  New
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835743] ------------[ cut here ]------------
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835747] WARNING: at /var/lib/dkms/intel-i915-backport-3.8-dkms/3.8.6.0/build/intel_dp.c:326 intel_dp_check_edp+0x6d/0xc0 [i915]()
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835748] Hardware name:  
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835748] eDP powered off while attempting aux channel communication.
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835748] Modules linked in: rtbth(O) ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs reiserfs ext2 rt2800pci rt2800lib crc_ccitt rt2x00pci rt2x00lib mac80211 cfg80211 eeprom_93cx6 nls_iso8859_1 snd_hda_codec_realtek(O) snd_hda_intel(O) snd_hda_codec(O) rfcomm dm_multipath bnep scsi_dh bluetooth snd_hwdep snd_pcm snd_seq_midi snd_rawmidi snd_seq_midi_event snd_seq snd_timer parport_pc snd_seq_device coretemp ppdev uvcvideo videobuf2_core kvm videodev rtsx_pci_ms videobuf2_vmalloc memstick psmouse videobuf2_memops mei serio_raw ghash_clmulni_intel snd joydev aesni_intel hp_wmi soundcore snd_page_alloc cryptd aes_x86_64 sparse_keymap mac_hid lpc_ich microcode lp parport binfmt_misc dm_raid45 xor dm_mirror dm_region_hash dm_log btrfs zlib_deflate libcrc32c hid_generic usbhid hid usb_storage rtsx_pci_sdmmc wmi rtsx_pci ahci libahci i915(O) drm_kms_helper drm i2c_algo_bit video [last unloaded: r8169]
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835768] Pid: 5296, comm: kworker/u:18 Tainted: G        W  O 3.5.0-30-generic #51~precise1-Ubuntu
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835768] Call Trace:
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835769]  [<ffffffff81052c8f>] warn_slowpath_common+0x7f/0xc0
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835770]  [<ffffffff81052d86>] warn_slowpath_fmt+0x46/0x50
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835772]  [<ffffffffa00c335d>] intel_dp_check_edp+0x6d/0xc0 [i915]
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835777]  [<ffffffffa00c3e74>] intel_dp_aux_native_write+0x34/0xf0 [i915]
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835782]  [<ffffffffa00c4575>] intel_dp_set_link_train+0xb5/0x300 [i915]
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835787]  [<ffffffffa00c4347>] ? intel_get_adjust_train+0x47/0x1c0 [i915]
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835792]  [<ffffffffa00c63b3>] intel_dp_complete_link_train+0xe3/0x2b0 [i915]
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835797]  [<ffffffffa00c66f0>] intel_dp_check_link_status+0xe0/0x1a0 [i915]
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835802]  [<ffffffffa00c67c5>] intel_dp_hot_plug+0x15/0x20 [i915]
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835807]  [<ffffffffa008f5de>] i915_hotplug_work_func+0x6e/0xa0 [i915]
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835811]  [<ffffffff81071af7>] process_one_work+0x127/0x470
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835812]  [<ffffffff81072d35>] worker_thread+0x165/0x370
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835813]  [<ffffffff81072bd0>] ? manage_workers.isra.29+0x130/0x130
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835814]  [<ffffffff81077cd3>] kthread+0x93/0xa0
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835815]  [<ffffffff816a6524>] kernel_thread_helper+0x4/0x10
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835816]  [<ffffffff81077c40>] ? flush_kthread_worker+0xb0/0xb0
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835817]  [<ffffffff816a6520>] ? gs_change+0x13/0x13
  May 22 07:20:11 ubuntu-desktop kernel: [ 3687.835818] ---[ end trace 6b87f9ae8a9261a4 ]---


  As you might expect, the intel-i915-backport-3.8-dkms is just a
  backport of the 3.8 driver code into the 3.5 kernel. We've experienced
  this problem on one late model HP system. The failure rate is 50%

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