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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

This issue appears to be an upstream bug, since you tested the latest
upstream kernel. Would it be possible for you to open an upstream bug
report[0]? That will allow the upstream Developers to examine the issue,
and may provide a quicker resolution to the bug.

Please follow the instructions on the wiki page[0]. The first step is to
email the appropriate mailing list. If no response is received, then a
bug may be opened on bugzilla.kernel.org.

Once this bug is reported upstream, please add the tag: 'kernel-bug-
reported-upstream'.

[0] https://wiki.ubuntu.com/Bugs/Upstream/kernel

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https://bugs.launchpad.net/bugs/1392501

Title:
  intel 915 graphics fails to detect monitor resolution

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  What should happen:

  Upon login, an external monitor connected via displayport to the
  laptop should be detected correctly and the screen size should be set
  to the correct resolution. Further, if the display sleeps, it should
  restore back to the previous state before powering off/sleeping the
  display.

  What happens:

  Starting up with an external monitor connected over displayport, the
  login screen is the correct resolution.  After logging in, it reverts
  to the same resolution as the laptop display and dumps a trace in
  dmesg.

  The resolution can be fixed by use of xrandr, but doesn't work 100% of
  the time.  Further, after the display sleeps, very often the display
  port never wakes up and no longer functions without removing the
  displayport cord, replugging and then re-running xrandr with the
  correct resolution.

  Here are the relevant dmesg bits.

  [   13.316104] [drm] write mode info 153
  [   13.318134] [drm] write mode info 153
  [   15.489330] [drm:intel_dp_aux_native_write] *ERROR* too many retries, giving up
  [   15.489335] [drm:intel_dp_start_link_train] *ERROR* failed to enable link training
  [   15.496326] [drm:intel_dp_aux_native_write] *ERROR* too many retries, giving up
  [   15.496328] [drm:intel_dp_complete_link_train] *ERROR* failed to start channel equalization
  [   15.528617] [drm:cpt_verify_modeset] *ERROR* mode set failed: pipe B stuck
  [   15.592730] ------------[ cut here ]------------
  [   15.592769] WARNING: CPU: 0 PID: 3009 at /build/buildd/linux-3.13.0/drivers/gpu/drm/i915/intel_display.c:9237 intel_modeset_check_state+0x62d/0x780 [i915]()
  [   15.592772] encoder's hw state doesn't match sw tracking (expected 1, found 0)
  [   15.592773] Modules linked in: ctr ccm ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp bridge stp llc ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables dm_crypt udl drm_usb syscopyarea sysfillrect rfcomm sysimgblt bnep binfmt_misc nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache ax88179_178a usbnet mii joydev uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev btusb bluetooth snd_usb_audio arc4 snd_usbmidi_lib iwldvm mac80211 intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul snd_hda_codec_hdmi ghash_clmulni_intel aesni_intel aes_x86_64 snd_hda_codec_realtek lrw gf128mul glue_helper ablk_helper cryptd snd_hda_intel snd_hda_codec serio_raw snd_hwdep snd_pcm snd_page_alloc lpc_ich snd_seq_midi snd_seq_midi_event snd_rawmidi thinkpad_acpi snd_seq iwlwifi snd_seq_device nvram snd_timer parport_pc cfg80211 snd ppdev intel_smartconnect mac_hid mei_me mei soundcore lp parport btrfs xor raid6_pq libcrc32c hid_generic usbhid hid i915 psmouse ahci libahci sdhci_pci i2c_algo_bit sdhci drm_kms_helper drm wmi video
  [   15.593042] CPU: 0 PID: 3009 Comm: Xorg Tainted: G        W     3.13.0-39-generic #66-Ubuntu
  [   15.593044] Hardware name: LENOVO 3443CTO/3443CTO, BIOS G6ET96WW (2.56 ) 04/29/2013
  [   15.593046]  0000000000000009 ffff8802101c7b68 ffffffff8171ece7 ffff8802101c7bb0
  [   15.593049]  ffff8802101c7ba0 ffffffff8106773d ffff8802101c7c20 0000000000000001
  [   15.593051]  ffff88020d60f800 ffff88020d60faf8 ffff88020d33a000 ffff8802101c7c00
  [   15.593053] Call Trace:
  [   15.593059]  [<ffffffff8171ece7>] dump_stack+0x45/0x56
  [   15.593063]  [<ffffffff8106773d>] warn_slowpath_common+0x7d/0xa0
  [   15.593064]  [<ffffffff810677ac>] warn_slowpath_fmt+0x4c/0x50
  [   15.593089]  [<ffffffffa010b4cd>] intel_modeset_check_state+0x62d/0x780 [i915]
  [   15.593106]  [<ffffffffa010b6b5>] intel_set_mode+0x25/0x30 [i915]
  [   15.593121]  [<ffffffffa010bf5b>] intel_crtc_set_config+0x7ab/0x9a0 [i915]
  [   15.593139]  [<ffffffffa0030eed>] drm_mode_set_config_internal+0x5d/0xe0 [drm]
  [   15.593153]  [<ffffffffa0033dd7>] drm_mode_setcrtc+0xf7/0x5e0 [drm]
  [   15.593165]  [<ffffffffa0024c22>] drm_ioctl+0x502/0x630 [drm]
  [   15.593174]  [<ffffffff811d03c0>] do_vfs_ioctl+0x2e0/0x4c0
  [   15.593178]  [<ffffffff811bf781>] ? __sb_end_write+0x31/0x60
  [   15.593180]  [<ffffffff811bd2f2>] ? vfs_write+0x192/0x1f0
  [   15.593182]  [<ffffffff811d0621>] SyS_ioctl+0x81/0xa0
  [   15.593185]  [<ffffffff8172f7ed>] system_call_fastpath+0x1a/0x1f
  [   15.593187] ---[ end trace af807806a5294a21 ]---
  [   15.593209] [drm:intel_pipe_config_compare] *ERROR* mismatch in has_dp_encoder (expected 1, found 0)
  [   15.593211] ------------[ cut here ]------------
  [   15.593226] WARNING: CPU: 0 PID: 3009 at /build/buildd/linux-3.13.0/drivers/gpu/drm/i915/intel_display.c:9310 check_crtc_state+0x255/0x340 [i915]()
  [   15.593227] pipe state doesn't match!
  [   15.593227] Modules linked in: ctr ccm ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT xt_CHECKSUM iptable_mangle xt_tcpudp bridge stp llc ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables dm_crypt udl drm_usb syscopyarea sysfillrect rfcomm sysimgblt bnep binfmt_misc nfsd auth_rpcgss nfs_acl nfs lockd sunrpc fscache ax88179_178a usbnet mii joydev uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev btusb bluetooth snd_usb_audio arc4 snd_usbmidi_lib iwldvm mac80211 intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul snd_hda_codec_hdmi ghash_clmulni_intel aesni_intel aes_x86_64 snd_hda_codec_realtek lrw gf128mul glue_helper ablk_helper cryptd snd_hda_intel snd_hda_codec serio_raw snd_hwdep snd_pcm snd_page_alloc lpc_ich snd_seq_midi snd_seq_midi_event snd_rawmidi thinkpad_acpi snd_seq iwlwifi snd_seq_device nvram snd_timer parport_pc cfg80211 snd ppdev intel_smartconnect mac_hid mei_me mei soundcore lp parport btrfs xor raid6_pq libcrc32c hid_generic usbhid hid i915 psmouse ahci libahci sdhci_pci i2c_algo_bit sdhci drm_kms_helper drm wmi video
  [   15.593270] CPU: 0 PID: 3009 Comm: Xorg Tainted: G        W     3.13.0-39-generic #66-Ubuntu
  [   15.593271] Hardware name: LENOVO 3443CTO/3443CTO, BIOS G6ET96WW (2.56 ) 04/29/2013
  [   15.593272]  0000000000000009 ffff8802101c78a8 ffffffff8171ece7 ffff8802101c78f0
  [   15.593273]  ffff8802101c78e0 ffffffff8106773d ffff88020d6ef6e0 ffff8802101c7970
  [   15.593275]  ffff88020d60f800 ffff88020d6ef000 ffff88020d60fb28 ffff8802101c7940
  [   15.593276] Call Trace:
  [   15.593278]  [<ffffffff8171ece7>] dump_stack+0x45/0x56
  [   15.593280]  [<ffffffff8106773d>] warn_slowpath_common+0x7d/0xa0
  [   15.593282]  [<ffffffff810677ac>] warn_slowpath_fmt+0x4c/0x50
  [   15.593292]  [<ffffffffa00fc23b>] ? intel_pipe_config_compare+0x60b/0xae0 [i915]
  [   15.593300]  [<ffffffffa00fda55>] check_crtc_state+0x255/0x340 [i915]
  [   15.593310]  [<ffffffffa010b15b>] intel_modeset_check_state+0x2bb/0x780 [i915]
  [   15.593319]  [<ffffffffa010b6b5>] intel_set_mode+0x25/0x30 [i915]
  [   15.593327]  [<ffffffffa010bf5b>] intel_crtc_set_config+0x7ab/0x9a0 [i915]
  [   15.593336]  [<ffffffffa0030eed>] drm_mode_set_config_internal+0x5d/0xe0 [drm]
  [   15.593345]  [<ffffffffa0033dd7>] drm_mode_setcrtc+0xf7/0x5e0 [drm]
  [   15.593352]  [<ffffffffa0024c22>] drm_ioctl+0x502/0x630 [drm]
  [   15.593357]  [<ffffffff811d03c0>] do_vfs_ioctl+0x2e0/0x4c0
  [   15.593359]  [<ffffffff811bf781>] ? __sb_end_write+0x31/0x60
  [   15.593361]  [<ffffffff811bd2f2>] ? vfs_write+0x192/0x1f0
  [   15.593363]  [<ffffffff811d0621>] SyS_ioctl+0x81/0xa0
  [   15.593364]  [<ffffffff8172f7ed>] system_call_fastpath+0x1a/0x1f
  [   15.593365] ---[ end trace af807806a5294a22 ]---
  [   29.030916] [drm] write mode info 153
  [   29.033243] [drm] write mode info 153

  
  1) Ubuntu 3.13.0-39.66-generic 3.13.11.8
  2) attached.

  % lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.0

  % apt-cache policy linux-generic
  linux-generic:
    Installed: 3.13.0.39.46
    Candidate: 3.13.0.39.46
    Version table:
   *** 3.13.0.39.46 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
          100 /var/lib/dpkg/status
       3.13.0.24.28 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-39-generic 3.13.0-39.66
  ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
  Uname: Linux 3.13.0-39-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  rharper    4069 F.... pulseaudio
   /dev/snd/controlC0:  rharper    4069 F.... pulseaudio
  CurrentDesktop: GNOME
  Date: Thu Nov 13 15:46:14 2014
  HibernationDevice: RESUME=UUID=d7de9528-c3f7-40ea-a43d-59c7d7beb216
  InstallationDate: Installed on 2013-10-15 (394 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Beta amd64 (20130925.1)
  MachineType: LENOVO 3443CTO
  ProcFB:
   0 inteldrmfb
   1 udldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-39-generic root=UUID=aa553e3a-3e79-4f9f-8be3-e40e357c06f7 ro splash quiet elevator=deadline plymouth:debug=1
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-39-generic N/A
   linux-backports-modules-3.13.0-39-generic  N/A
   linux-firmware                             1.127.8
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-08-01 (104 days ago)
  dmi.bios.date: 04/29/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G6ET96WW (2.56 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 3443CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrG6ET96WW(2.56):bd04/29/2013:svnLENOVO:pn3443CTO:pvrThinkPadX1Carbon:rvnLENOVO:rn3443CTO:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 3443CTO
  dmi.product.version: ThinkPad X1 Carbon
  dmi.sys.vendor: LENOVO

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