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[harrychillboy <1314213@xxxxxxxxxxxxxxxxxx>]

This happens often when my laptop even with power supply left alone for
a while for the screens to get turn off. When I log back -in or press a
key to get to login screen, the second monitor never turns on. I have to
unplug and plug the monitor DVI cable to get the monitor to show the
screen.

I have verified that Ubuntu 14.04 thinks that both the monitors are on
even when just my laptop screen it working and external monitor is all
blank ( no signal ). This is happening on my lenovo x1 carbon which has
intel hd4000 graphics.

=================

[   11.201868] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training
[   11.208716] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization
[   11.241197] [drm:cpt_verify_modeset] *ERROR* mode set failed: pipe B stuck
[   11.305306] ------------[ cut here ]------------
[   11.305364] WARNING: CPU: 2 PID: 1250 at /var/lib/dkms/i915-3.15-3.13/0.01/build/drivers/gpu/drm/i915/intel_display.c:9763 intel_modeset_check_state+0x5bc/0x770 [i915]()
[   11.305365] encoder's hw state doesn't match sw tracking (expected 1, found 0)
[   11.305366] Modules linked in: ctr ccm acpi_call(OX) snd_hda_codec_hdmi snd_hda_codec_realtek rfcomm bnep bluetooth uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev hid_generic usbhid hid binfmt_misc joydev snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event intel_rapl x86_pkg_temp_thermal snd_rawmidi intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_seq arc4 aesni_intel aes_x86_64 lrw gf128mul glue_helper iwldvm ablk_helper cryptd mac80211 serio_raw iwlwifi thinkpad_acpi cfg80211 snd_seq_device wmi nvram snd_timer snd soundcore mei_me parport_pc intel_smartconnect mei i915(OX) ppdev video lpc_ich drm_kms_helper(OX) drm(OX) i2c_algo_bit mac_hid lp parport psmouse ahci libahci sdhci_pci sdhci
[   11.305392] CPU: 2 PID: 1250 Comm: Xorg Tainted: G           OX 3.13.0-37-generic #64-Ubuntu
[   11.305393] Hardware name: LENOVO 3460AJ1/3460AJ1, BIOS G6ETA7WW (2.67 ) 06/12/2014
[   11.305394]  0000000000000009 ffff8800c6c11b80 ffffffff8171ed09 ffff8800c6c11bc8
[   11.305396]  ffff8800c6c11bb8 ffffffff8106773d ffff8800c6c11c38 0000000000000001
[   11.305398]  ffff88021219f000 ffff88021219f320 ffff88020eab8800 ffff8800c6c11c18
[   11.305399] Call Trace:
[   11.305403]  [<ffffffff8171ed09>] dump_stack+0x45/0x56
[   11.305406]  [<ffffffff8106773d>] warn_slowpath_common+0x7d/0xa0
[   11.305408]  [<ffffffff810677ac>] warn_slowpath_fmt+0x4c/0x50
[   11.305418]  [<ffffffffa0129cdc>] intel_modeset_check_state+0x5bc/0x770 [i915]
[   11.305427]  [<ffffffffa0129f25>] intel_set_mode+0x25/0x30 [i915]
[   11.305436]  [<ffffffffa012adcd>] intel_crtc_set_config+0x8ed/0xdc0 [i915]
[   11.305447]  [<ffffffffa0076351>] drm_mode_set_config_internal+0x61/0xf0 [drm]
[   11.305455]  [<ffffffffa0079aa9>] drm_mode_setcrtc+0xd9/0x5e0 [drm]
[   11.305461]  [<ffffffffa006a9e9>] drm_ioctl+0x229/0x600 [drm]
[   11.305469]  [<ffffffffa00799d0>] ? drm_mode_setplane+0x410/0x410 [drm]
[   11.305473]  [<ffffffff811d03a0>] do_vfs_ioctl+0x2e0/0x4c0
[   11.305475]  [<ffffffff811bf761>] ? __sb_end_write+0x31/0x60
[   11.305477]  [<ffffffff811bd2d2>] ? vfs_write+0x192/0x1f0
[   11.305479]  [<ffffffff811d0601>] SyS_ioctl+0x81/0xa0
[   11.305482]  [<ffffffff8172f82d>] system_call_fastpath+0x1a/0x1f
[   11.305483] ---[ end trace d0acff2a2d4c1e2d ]---
[   11.305508] [drm:intel_pipe_config_compare] *ERROR* mismatch in has_dp_encoder (expected 1, found 0)
[   11.305510] ------------[ cut here ]------------

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https://bugs.launchpad.net/bugs/1314213

Title:
  [Lenovo ThinkPad X220] External DP1 monitor extremely unstable since
  upgrade to 14.04

Status in “xorg” package in Ubuntu:
  Confirmed

Bug description:
  Since upgrade to 14.04, using my Dell BIZLINK DisplayPort to DVI Dual
  Link Adapter the external display on DP1 is extremely unstable. I get
  constant "[drm:intel_dp_i2c_aux_ch] *ERROR* too many retries, giving
  up" messages over dmesg. I used to get those with 13.10, but there was
  no stability issue. Once the laptop (Lenovo X220) is connected to the
  monitor (resolution is 2560x1600), if I run any program like xrandr or
  unity-control-center, the system immediately reverts from the external
  display to the laptop display, and often crashes becoming
  unresponsive. Every time I run xrandr or unity-control-center, it
  triggers 20 "[drm:intel_dp_i2c_aux_ch] *ERROR* too many retries,
  giving up" messages in dmesg and if I am using the external monitor it
  further triggers a reproducible crash. It is possible that this might
  be related to the DVI->DP adapter I am using. Due to an unresolved
  bug, the correct EDID for the monitor is not recognized, and I have to
  manually add that after each boot.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  genovese   2538 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Tue Apr 29 10:00:31 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2013-01-21 (463 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: LENOVO 42872WU
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=1f880233-e827-4c00-b11a-2c7a4eb76497 ro quiet splash nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw nomdmonddf nomdmonisw vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-18 (10 days ago)
  dmi.bios.date: 08/31/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 8DET64WW (1.34 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 42872WU
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr8DET64WW(1.34):bd08/31/2012:svnLENOVO:pn42872WU:pvrThinkPadX220:rvnLENOVO:rn42872WU:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 42872WU
  dmi.product.version: ThinkPad X220
  dmi.sys.vendor: LENOVO

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