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["James M. Leddy" <1194934@xxxxxxxxxxxxxxxxxx>]

In fact, we have not been able to reproduce this problem with a 3.10
kernel. Closing for now.

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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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