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[Bug 1501993] UdevLog.txt

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: Martin Smith <1501993@xxxxxxxxxxxxxxxxxx>
Date: Fri, 02 Oct 2015 02:55:23 -0000
Reply-to: Bug 1501993 <1501993@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
apport information

** Attachment added: "UdevLog.txt"
   https://bugs.launchpad.net/bugs/1501993/+attachment/4481524/+files/UdevLog.txt

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https://bugs.launchpad.net/bugs/1501993

Title:
  drivers/gpu/drm/i915/intel_display.c:12326
  check_crtc_state+0x2c5/0x440 [i915]()

Status in linux package in Ubuntu:
  New

Bug description:
  Hi there --

  I'm seeing a kernel hang when I 'dock' my laptop into my docking station; this happens with 4.2, specifically with:
  linux-image-extra-4.2.0-11-generic
  linux-image-extra-4.2.0-12-generic

  Oct  1 21:38:33 mart6985-laptop kernel: [  876.317186] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:34 mart6985-laptop kernel: [  877.156378] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:35 mart6985-laptop kernel: [  877.995466] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:35 mart6985-laptop kernel: [  877.995698] [drm:intel_dp_complete_link_train [i915]] *ERROR* failed to train DP, aborting
  Oct  1 21:38:36 mart6985-laptop kernel: [  878.825806] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:37 mart6985-laptop kernel: [  879.664854] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:38 mart6985-laptop kernel: [  880.503908] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:38 mart6985-laptop kernel: [  880.821042] ACPI Error: Index value 0x0000000000000083 overflows field width 0x7 (20150619/exfldio-341)
  Oct  1 21:38:38 mart6985-laptop kernel: [  880.821046] ACPI Error: Method parse/execution failed [\NEVT] (Node ffff88040e0c7258), AE_AML_REGISTER_LIMIT (20150619/pspa
  rse-536)
  Oct  1 21:38:38 mart6985-laptop kernel: [  880.821050] ACPI Error: Method parse/execution failed [\_SB_.PCI0.LPCB.ECDV._Q66] (Node ffff88040e0c4b90), AE_AML_REGISTER_
  LIMIT (20150619/psparse-536)
  Oct  1 21:38:38 mart6985-laptop kernel: [  881.343010] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998373] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998374] ------------[ cut here ]------------
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998386] WARNING: CPU: 1 PID: 1038 at /build/linux-X28llO/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_c
  rtc_state+0x2c5/0x440 [i915]()
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998387] pipe state doesn't match!
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998387] Modules linked in: hid_generic usbhid iptable_filter ip_tables x_tables ctr ccm rfcomm btusb btrtl btbcm btinte
  l pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bnep bluetooth binfmt_misc pn544_mei mei_phy pn544 arc4 hci nfc dell_wmi iwlmvm sparse_keymap mac8021
  1 dell_laptop dcdbas dell_smm_hwmon intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp iwlwifi uvcvideo input_leds videobuf2_vmalloc kvm_intel videobu
  f2_memops kvm cfg80211 joydev serio_raw videobuf2_core v4l2_common snd_hda_codec_hdmi videodev media lpc_ich snd_hda_codec_realtek snd_soc_rt5640 snd_soc_rl6231 snd_h
  da_codec_generic snd_soc_core shpchp snd_compress ac97_bus snd_hda_intel snd_pcm_dmaengine snd_hda_codec snd_seq_midi snd_seq_midi_event snd_hda_core snd_hwdep snd_ra
  wmidi mei_me snd_pcm mei snd_seq snd_seq_device snd_timer 8250_fintek snd dell_smo8800 soundcore dw_dmac snd_soc_sst_acpi dw_dmac_core 8250_dw i2c_designware_platform
   i2c_designware_core spi_pxa2xx_platform dell_rbtn mac_hid nfsd auth_rpcgss nfs_acl lockd parport_pc grace sunrpc ppdev lp parport autofs4 drbg ansi_cprng algif_skcip
  her af_alg dm_crypt crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper i915 ablk_helper cryptd psmouse ahci libahci i2c
  _algo_bit sdhci_pci drm_kms_helper e1000e drm ptp pps_core wmi sdhci_acpi video sdhci i2c_hid hid
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998438] CPU: 1 PID: 1038 Comm: Xorg Tainted: G        W  OE   4.2.0-12-generic #14-Ubuntu
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998439] Hardware name: Dell Inc. Latitude E7440/03HFCG, BIOS A14 02/02/2015
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998440]  ffffffffc02b2ab0 ffff8800da29f7e8 ffffffff817b0cd5 0000000000000000
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998442]  ffff8800da29f838 ffff8800da29f828 ffffffff81076536 ffff8800da29f858
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998443]  ffff8800da29f8c0 ffff8800d9e08800 0000000000000001 ffff8800d9e08b50
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998445] Call Trace:
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998450]  [<ffffffff817b0cd5>] dump_stack+0x45/0x57
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998454]  [<ffffffff81076536>] warn_slowpath_common+0x86/0xc0
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998455]  [<ffffffff810765b6>] warn_slowpath_fmt+0x46/0x50
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998465]  [<ffffffffc02454d1>] ? intel_pipe_config_compare+0xb31/0xc60 [i915]
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998474]  [<ffffffffc02458c5>] check_crtc_state+0x2c5/0x440 [i915]
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998485]  [<ffffffffc02593de>] intel_modeset_check_state+0x20e/0x6b0 [i915]
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998495]  [<ffffffffc025a587>] intel_crtc_set_config+0x4c7/0x580 [i915]
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998505]  [<ffffffffc008b915>] ? drm_mode_create+0x25/0x60 [drm]
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998512]  [<ffffffffc0085036>] drm_mode_set_config_internal+0x66/0x100 [drm]
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998520]  [<ffffffffc00895f8>] drm_mode_setcrtc+0x3a8/0x4c0 [drm]
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998525]  [<ffffffffc007a365>] drm_ioctl+0x125/0x610 [drm]
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998527]  [<ffffffff81265a0d>] ? sysfs_notify+0x5d/0x90
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998533]  [<ffffffffc0089250>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998535]  [<ffffffff810a78f9>] ? update_curr+0x119/0x150
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998539]  [<ffffffff81200075>] do_vfs_ioctl+0x285/0x470
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998541]  [<ffffffff811ef785>] ? __sb_end_write+0x35/0x70
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998542]  [<ffffffff812002d9>] SyS_ioctl+0x79/0x90
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998545]  [<ffffffff817b7572>] entry_SYSCALL_64_fastpath+0x16/0x75
  Oct  1 21:38:39 mart6985-laptop kernel: [  881.998546] ---[ end trace b2fe7c20758e2f50 ]---
  Oct  1 21:38:39 mart6985-laptop kernel: [  882.067292] [drm:intel_mst_enable_dp [i915]] *ERROR* Timed out waiting for ACT sent
  Oct  1 21:38:39 mart6985-laptop kernel: [  882.182123] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:40 mart6985-laptop kernel: [  883.021220] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:41 mart6985-laptop kernel: [  883.860292] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:41 mart6985-laptop kernel: [  883.860524] [drm:intel_dp_complete_link_train [i915]] *ERROR* failed to train DP, aborting
  Oct  1 21:38:42 mart6985-laptop kernel: [  884.685456] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:43 mart6985-laptop kernel: [  885.524501] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:43 mart6985-laptop kernel: [  886.363581] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up
  Oct  1 21:38:44 mart6985-laptop kernel: [  887.202640] [drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up

  
  And then almost immediately after:
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903150] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903153] ------------[ cut here ]------------
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903166] WARNING: CPU: 2 PID: 1038 at /build/linux-X28llO/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]()
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903167] pipe state doesn't match!
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903168] Modules linked in: hid_generic usbhid iptable_filter ip_tables x_tables ctr ccm rfcomm btusb btrtl btbcm btintel pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bnep bluetooth binfmt_misc pn544_mei mei_phy pn544 arc4 hci nfc dell_wmi iwlmvm sparse_keymap mac80211 dell_laptop dcdbas dell_smm_hwmon intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp iwlwifi uvcvideo input_leds videobuf2_vmalloc kvm_intel videobuf2_memops kvm cfg80211 joydev serio_raw videobuf2_core v4l2_common snd_hda_codec_hdmi videodev media lpc_ich snd_hda_codec_realtek snd_soc_rt5640 snd_soc_rl6231 snd_hda_codec_generic snd_soc_core shpchp snd_compress ac97_bus snd_hda_intel snd_pcm_dmaengine snd_hda_codec snd_seq_midi snd_seq_midi_event snd_hda_core snd_hwdep snd_rawmidi mei_me snd_pcm mei snd_seq snd_seq_device snd_timer 8250_fintek snd dell_smo8800 soundcore dw_dmac snd_soc_sst_acpi dw_dmac_core 8250_dw i2c_designware_platform i2c_designware_core spi_pxa2xx_platform dell_rbtn mac_hid nfsd auth_rpcgss nfs_acl lockd parport_pc grace sunrpc ppdev lp parport autofs4 drbg ansi_cprng algif_skcipher af_alg dm_crypt crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper i915 ablk_helper cryptd psmouse ahci libahci i2c_algo_bit sdhci_pci drm_kms_helper e1000e drm ptp pps_core wmi sdhci_acpi video sdhci i2c_hid hid
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903232] CPU: 2 PID: 1038 Comm: Xorg Tainted: G        W  OE   4.2.0-12-generic #14-Ubuntu
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903233] Hardware name: Dell Inc. Latitude E7440/03HFCG, BIOS A14 02/02/2015
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903234]  ffffffffc02b2ab0 ffff8800da29f7e8 ffffffff817b0cd5 0000000000000000
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903237]  ffff8800da29f838 ffff8800da29f828 ffffffff81076536 ffff8800da29f858
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903239]  ffff8800da29f8c0 ffff8800d9e08800 0000000000000001 ffff8800d9e08b50
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903241] Call Trace:
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903246]  [<ffffffff817b0cd5>] dump_stack+0x45/0x57
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903249]  [<ffffffff81076536>] warn_slowpath_common+0x86/0xc0
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903251]  [<ffffffff810765b6>] warn_slowpath_fmt+0x46/0x50
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903265]  [<ffffffffc02454d1>] ? intel_pipe_config_compare+0xb31/0xc60 [i915]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903275]  [<ffffffffc02458c5>] check_crtc_state+0x2c5/0x440 [i915]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903288]  [<ffffffffc02593de>] intel_modeset_check_state+0x20e/0x6b0 [i915]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903299]  [<ffffffffc025a587>] intel_crtc_set_config+0x4c7/0x580 [i915]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903311]  [<ffffffffc008b915>] ? drm_mode_create+0x25/0x60 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903319]  [<ffffffffc0085036>] drm_mode_set_config_internal+0x66/0x100 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903327]  [<ffffffffc00895f8>] drm_mode_setcrtc+0x3a8/0x4c0 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903333]  [<ffffffffc007a365>] drm_ioctl+0x125/0x610 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903341]  [<ffffffffc0089250>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903344]  [<ffffffff81200075>] do_vfs_ioctl+0x285/0x470
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903346]  [<ffffffff8108190f>] ? recalc_sigpending+0x1f/0x60
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903348]  [<ffffffff810828b2>] ? __set_task_blocked+0x32/0x70
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903350]  [<ffffffff812002d9>] SyS_ioctl+0x79/0x90
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903353]  [<ffffffff817b7572>] entry_SYSCALL_64_fastpath+0x16/0x75
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903354] ---[ end trace b2fe7c20758e2f51 ]---
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903372] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ddi_pll_sel (expected 0x00000000, found 0x20000000)
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903373] ------------[ cut here ]------------
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903383] WARNING: CPU: 2 PID: 1038 at /build/linux-X28llO/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_c
  rtc_state+0x2c5/0x440 [i915]()
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903384] pipe state doesn't match!
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903385] Modules linked in: hid_generic usbhid iptable_filter ip_tables x_tables ctr ccm rfcomm btusb btrtl btbcm btintel pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bnep bluetooth binfmt_misc pn544_mei mei_phy pn544 arc4 hci nfc dell_wmi iwlmvm sparse_keymap mac80211 dell_laptop dcdbas dell_smm_hwmon intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp iwlwifi uvcvideo input_leds videobuf2_vmalloc kvm_intel videobuf2_memops kvm cfg80211 joydev serio_raw videobuf2_core v4l2_common snd_hda_codec_hdmi videodev media lpc_ich snd_hda_codec_realtek snd_soc_rt5640 snd_soc_rl6231 snd_hda_codec_generic snd_soc_core shpchp snd_compress ac97_bus snd_hda_intel snd_pcm_dmaengine snd_hda_codec snd_seq_midi snd_seq_midi_event snd_hda_core snd_hwdep snd_rawmidi mei_me snd_pcm mei snd_seq snd_seq_device snd_timer 8250_fintek snd dell_smo8800 soundcore dw_dmac snd_soc_sst_acpi dw_dmac_core 8250_dw i2c_designware_platform i2c_designware_core spi_pxa2xx_platform dell_rbtn mac_hid nfsd auth_rpcgss nfs_acl lockd parport_pc grace sunrpc ppdev lp parport autofs4 drbg ansi_cprng algif_skcipher af_alg dm_crypt crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper i915 ablk_helper cryptd psmouse ahci libahci i2c_algo_bit sdhci_pci drm_kms_helper e1000e drm ptp pps_core wmi sdhci_acpi video sdhci i2c_hid hid
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903438] CPU: 2 PID: 1038 Comm: Xorg Tainted: G        W  OE   4.2.0-12-generic #14-Ubuntu
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903439] Hardware name: Dell Inc. Latitude E7440/03HFCG, BIOS A14 02/02/2015
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903440]  ffffffffc02b2ab0 ffff8800da29f7e8 ffffffff817b0cd5 0000000000000000
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903442]  ffff8800da29f838 ffff8800da29f828 ffffffff81076536 ffff8800da29f858
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903444]  ffff8800da29f8c0 ffff8800d9e08800 0000000000000001 ffff8800d9e08b50
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903446] Call Trace:
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903448]  [<ffffffff817b0cd5>] dump_stack+0x45/0x57
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903450]  [<ffffffff81076536>] warn_slowpath_common+0x86/0xc0
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903452]  [<ffffffff810765b6>] warn_slowpath_fmt+0x46/0x50
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903462]  [<ffffffffc0245479>] ? intel_pipe_config_compare+0xad9/0xc60 [i915]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903472]  [<ffffffffc02458c5>] check_crtc_state+0x2c5/0x440 [i915]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903484]  [<ffffffffc02593de>] intel_modeset_check_state+0x20e/0x6b0 [i915]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903494]  [<ffffffffc025a587>] intel_crtc_set_config+0x4c7/0x580 [i915]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903503]  [<ffffffffc008b915>] ? drm_mode_create+0x25/0x60 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903511]  [<ffffffffc0085036>] drm_mode_set_config_internal+0x66/0x100 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903519]  [<ffffffffc00895f8>] drm_mode_setcrtc+0x3a8/0x4c0 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903525]  [<ffffffffc007a365>] drm_ioctl+0x125/0x610 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903533]  [<ffffffffc0089250>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903535]  [<ffffffff81200075>] do_vfs_ioctl+0x285/0x470
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903537]  [<ffffffff8108190f>] ? recalc_sigpending+0x1f/0x60
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903539]  [<ffffffff810828b2>] ? __set_task_blocked+0x32/0x70
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903541]  [<ffffffff812002d9>] SyS_ioctl+0x79/0x90
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903544]  [<ffffffff817b7572>] entry_SYSCALL_64_fastpath+0x16/0x75
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903545] ---[ end trace b2fe7c20758e2f52 ]---
  Oct  1 21:38:45 mart6985-laptop kernel: [  888.180361] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
  Oct  1 21:38:45 mart6985-laptop kernel: [  888.180364] ------------[ cut here ]------------
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903373] ------------[ cut here ]------------
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903383] WARNING: CPU: 2 PID: 1038 at /build/linux-X28llO/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_c
  rtc_state+0x2c5/0x440 [i915]()
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903384] pipe state doesn't match!
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903385] Modules linked in: hid_generic usbhid iptable_filter ip_tables x_tables ctr ccm rfcomm btusb btrtl btbcm btintel pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bnep bluetooth binfmt_misc pn544_mei mei_phy pn544 arc4 hci nfc dell_wmi iwlmvm sparse_keymap mac80211 dell_laptop dcdbas dell_smm_hwmon intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp iwlwifi uvcvideo input_leds videobuf2_vmalloc kvm_intel videobuf2_memops kvm cfg80211 joydev serio_raw videobuf2_core v4l2_common snd_hda_codec_hdmi videodev media lpc_ich snd_hda_codec_realtek snd_soc_rt5640 snd_soc_rl6231 snd_hda_codec_generic snd_soc_core shpchp snd_compress ac97_bus snd_hda_intel snd_pcm_dmaengine snd_hda_codec snd_seq_midi snd_seq_midi_event snd_hda_core snd_hwdep snd_rawmidi mei_me snd_pcm mei snd_seq snd_seq_device snd_timer 8250_fintek snd dell_smo8800 soundcore dw_dmac snd_soc_sst_acpi dw_dmac_core 8250_dw i2c_designware_platform i2c_designware_core spi_pxa2xx_platform dell_rbtn mac_hid nfsd auth_rpcgss nfs_acl lockd parport_pc grace sunrpc ppdev lp parport autofs4 drbg ansi_cprng algif_skcipher af_alg dm_crypt crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper i915 ablk_helper cryptd psmouse ahci libahci i2c_algo_bit sdhci_pci drm_kms_helper e1000e drm ptp pps_core wmi sdhci_acpi video sdhci i2c_hid hid
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903438] CPU: 2 PID: 1038 Comm: Xorg Tainted: G        W  OE   4.2.0-12-generic #14-Ubuntu
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903439] Hardware name: Dell Inc. Latitude E7440/03HFCG, BIOS A14 02/02/2015
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903440]  ffffffffc02b2ab0 ffff8800da29f7e8 ffffffff817b0cd5 0000000000000000
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903442]  ffff8800da29f838 ffff8800da29f828 ffffffff81076536 ffff8800da29f858
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903444]  ffff8800da29f8c0 ffff8800d9e08800 0000000000000001 ffff8800d9e08b50
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903446] Call Trace:
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903448]  [<ffffffff817b0cd5>] dump_stack+0x45/0x57
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903450]  [<ffffffff81076536>] warn_slowpath_common+0x86/0xc0
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903452]  [<ffffffff810765b6>] warn_slowpath_fmt+0x46/0x50
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903462]  [<ffffffffc0245479>] ? intel_pipe_config_compare+0xad9/0xc60 [i915]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903472]  [<ffffffffc02458c5>] check_crtc_state+0x2c5/0x440 [i915]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903484]  [<ffffffffc02593de>] intel_modeset_check_state+0x20e/0x6b0 [i915]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903494]  [<ffffffffc025a587>] intel_crtc_set_config+0x4c7/0x580 [i915]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903503]  [<ffffffffc008b915>] ? drm_mode_create+0x25/0x60 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903511]  [<ffffffffc0085036>] drm_mode_set_config_internal+0x66/0x100 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903519]  [<ffffffffc00895f8>] drm_mode_setcrtc+0x3a8/0x4c0 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903525]  [<ffffffffc007a365>] drm_ioctl+0x125/0x610 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903533]  [<ffffffffc0089250>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903535]  [<ffffffff81200075>] do_vfs_ioctl+0x285/0x470
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903537]  [<ffffffff8108190f>] ? recalc_sigpending+0x1f/0x60
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903539]  [<ffffffff810828b2>] ? __set_task_blocked+0x32/0x70
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903541]  [<ffffffff812002d9>] SyS_ioctl+0x79/0x90
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903544]  [<ffffffff817b7572>] entry_SYSCALL_64_fastpath+0x16/0x75
  Oct  1 21:38:45 mart6985-laptop kernel: [  887.903545] ---[ end trace b2fe7c20758e2f52 ]---
  Oct  1 21:38:45 mart6985-laptop kernel: [  888.180361] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
  Oct  1 21:38:45 mart6985-laptop kernel: [  888.180364] ------------[ cut here ]------------

  
  At this point I lose video, and can't do much else without a hard reboot back to linux-image-extra-3.19.0-30-generic.
  --- 
  ApportVersion: 2.19-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  mart6985   1824 F.... pulseaudio
   /dev/snd/controlC0:  mart6985   1824 F.... pulseaudio
  DistroRelease: Ubuntu 15.10
  HibernationDevice: RESUME=UUID=ef25a70d-08ea-4cfb-a7a0-ab30671365cc
  InstallationDate: Installed on 2014-07-02 (456 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Latitude E7440
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-30-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.19.0-30.33-generic 3.19.8-ckt6
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-30-generic N/A
   linux-backports-modules-3.19.0-30-generic  N/A
   linux-firmware                             1.148
  Tags:  wily
  Uname: Linux 3.19.0-30-generic x86_64
  UpgradeStatus: Upgraded to wily on 2015-09-29 (3 days ago)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 02/02/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A14
  dmi.board.name: 03HFCG
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA14:bd02/02/2015:svnDellInc.:pnLatitudeE7440:pvr01:rvnDellInc.:rn03HFCG:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7440
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.
  --- 
  ApportVersion: 2.19-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  mart6985   1824 F.... pulseaudio
   /dev/snd/controlC0:  mart6985   1824 F.... pulseaudio
  DistroRelease: Ubuntu 15.10
  HibernationDevice: RESUME=UUID=ef25a70d-08ea-4cfb-a7a0-ab30671365cc
  InstallationDate: Installed on 2014-07-02 (456 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Dell Inc. Latitude E7440
  Package: linux-image-4.2.0-12-generic 4.2.0-12.14
  PackageArchitecture: amd64
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-30-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.19.0-30.33-generic 3.19.8-ckt6
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-30-generic N/A
   linux-backports-modules-3.19.0-30-generic  N/A
   linux-firmware                             1.148
  Tags:  wily
  Uname: Linux 3.19.0-30-generic x86_64
  UpgradeStatus: Upgraded to wily on 2015-09-29 (3 days ago)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 02/02/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A14
  dmi.board.name: 03HFCG
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA14:bd02/02/2015:svnDellInc.:pnLatitudeE7440:pvr01:rvnDellInc.:rn03HFCG:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7440
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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References

[Bug 1501993] [NEW] drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]()
From: Martin Smith, 2015-10-02