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[Bug 1501993] Re: drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]()

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: "Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>
Date: Sat, 03 Oct 2015 15:46:43 -0000
Reply-to: Bug 1501993 <1501993@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Martin Smith, could you please test the latest upstream kernel available
from the very top line at the top of the page from
http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D (the release
names are irrelevant for testing, and please do not test the daily
folder)? Install instructions are available at
https://wiki.ubuntu.com/Kernel/MainlineBuilds . This will allow
additional upstream developers to examine the issue.

If the latest kernel did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this issue is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description:
kernel-fixed-upstream
kernel-fixed-upstream-X.Y-rcZ

Where X, Y, and Z are numbers corresponding to the kernel version.

If the mainline kernel does not fix the issue, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-X.Y-rcZ

Please note, an error to install the kernel does not fit the criteria of
kernel-bug-exists-upstream.

Once testing of the latest upstream kernel is complete, please mark this
report's Status as Confirmed. Please let us know your results.

Thank you for your understanding.

** Tags removed: bios-outdated-a15
** Tags added: latest-bios-a15

** Changed in: linux (Ubuntu)
   Importance: Low => Medium

-- 
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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:
  Incomplete

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