The bug appeared after upgrade from Ubuntu 15.04 to 15.10 or possibly after
some refular update after that.

I have now upgraded to the lates BIOS (A16) but the problem remains. Should
I re-run something to report potentially updated files?

Below are the (this time two) "cut here" sections.

Kind regards,
  Patrik

[    3.853328] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in
ips_enabled (expected 1, found 0)
[    3.853331] ------------[ cut here ]------------
[    3.853343] WARNING: CPU: 0 PID: 343 at
/build/linux-jJX2Dm/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326
check_crtc_state+0x2c5/0x440 [i915]()
[    3.853344] pipe state doesn't match!
[    3.853345] Modules linked in: bnep binfmt_misc arc4 pn544_mei mei_phy
pn544 hci dell_laptop dcdbas nfc dell_smm_hwmon dell_wmi sparse_keymap
intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp btusb
kvm_intel btrtl btbcm btintel kvm bluetooth uvcvideo videobuf2_vmalloc
crct10dif_pclmul videobuf2_memops crc32_pclmul videobuf2_core
ghash_clmulni_intel v4l2_common cdc_mbim videodev cdc_wdm cdc_ncm media
iwlmvm qcserial usbnet usb_wwan mii usbserial mac80211 aesni_intel
aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel input_leds
serio_raw snd_hda_codec iwlwifi snd_hda_core snd_hwdep lpc_ich cfg80211
snd_soc_rt5640 snd_soc_rl6231 snd_soc_core snd_compress ac97_bus
snd_pcm_dmaengine mei_me snd_pcm shpchp
[    3.853376]  mei snd_seq_midi joydev snd_seq_midi_event snd_rawmidi
8250_fintek snd_seq dell_smo8800 snd_seq_device snd_timer dw_dmac
dw_dmac_core snd_soc_sst_acpi snd soundcore dell_rbtn 8250_dw
i2c_designware_platform i2c_designware_core spi_pxa2xx_platform mac_hid
parport_pc ppdev lp parport autofs4 uas usb_storage i915 psmouse
i2c_algo_bit sdhci_pci ahci drm_kms_helper e1000e libahci drm ptp pps_core
wmi sdhci_acpi sdhci video i2c_hid hid
[    3.853398] CPU: 0 PID: 343 Comm: plymouthd Not tainted 4.2.0-18-generic
#22-Ubuntu
[    3.853399] Hardware name: Dell Inc. Latitude E7440/07F3F4, BIOS A16
09/01/2015
[    3.853400]  0000000000000000 000000008b6d1e83 ffff8804096337c8
ffffffff817e8c09
[    3.853402]  0000000000000000 ffff880409633820 ffff880409633808
ffffffff8107b3c6
[    3.853403]  ffff880409633848 ffff8804096338b0 ffff8800d9fe8000
0000000000000001
[    3.853405] Call Trace:
[    3.853409]  [<ffffffff817e8c09>] dump_stack+0x45/0x57
[    3.853413]  [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
[    3.853415]  [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
[    3.853426]  [<ffffffffc0225bc1>] ?
intel_pipe_config_compare+0xb31/0xc60 [i915]
[    3.853435]  [<ffffffffc0225fb5>] check_crtc_state+0x2c5/0x440 [i915]
[    3.853449]  [<ffffffffc0239d6d>] intel_modeset_check_state+0x21d/0x6d0
[i915]
[    3.853508]  [<ffffffffc023af27>] intel_crtc_set_config+0x4c7/0x580
[i915]
[    3.853519]  [<ffffffffc008bee5>] ? drm_mode_create+0x25/0x60 [drm]
[    3.853526]  [<ffffffffc00854c6>]
drm_mode_set_config_internal+0x66/0x100 [drm]
[    3.853533]  [<ffffffffc0089b29>] drm_mode_setcrtc+0x3e9/0x500 [drm]
[    3.853538]  [<ffffffffc007a495>] drm_ioctl+0x125/0x610 [drm]
[    3.853545]  [<ffffffffc0089740>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
[    3.853548]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
[    3.853550]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
[    3.853552]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[    3.853553] ---[ end trace 95944ca887982c2f ]---
[    3.856181] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in
ips_enabled (expected 1, found 0)
[    3.856183] ------------[ cut here ]------------
[    3.856192] WARNING: CPU: 0 PID: 343 at
/build/linux-jJX2Dm/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326
check_crtc_state+0x2c5/0x440 [i915]()
[    3.856192] pipe state doesn't match!
[    3.856193] Modules linked in: bnep binfmt_misc arc4 pn544_mei mei_phy
pn544 hci dell_laptop dcdbas nfc dell_smm_hwmon dell_wmi sparse_keymap
intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp btusb
kvm_intel btrtl btbcm btintel kvm bluetooth uvcvideo videobuf2_vmalloc
crct10dif_pclmul videobuf2_memops crc32_pclmul videobuf2_core
ghash_clmulni_intel v4l2_common cdc_mbim videodev cdc_wdm cdc_ncm media
iwlmvm qcserial usbnet usb_wwan mii usbserial mac80211 aesni_intel
aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel input_leds
serio_raw snd_hda_codec iwlwifi snd_hda_core snd_hwdep lpc_ich cfg80211
snd_soc_rt5640 snd_soc_rl6231 snd_soc_core snd_compress ac97_bus
snd_pcm_dmaengine mei_me snd_pcm shpchp
[    3.856219]  mei snd_seq_midi joydev snd_seq_midi_event snd_rawmidi
8250_fintek snd_seq dell_smo8800 snd_seq_device snd_timer dw_dmac
dw_dmac_core snd_soc_sst_acpi snd soundcore dell_rbtn 8250_dw
i2c_designware_platform i2c_designware_core spi_pxa2xx_platform mac_hid
parport_pc ppdev lp parport autofs4 uas usb_storage i915 psmouse
i2c_algo_bit sdhci_pci ahci drm_kms_helper e1000e libahci drm ptp pps_core
wmi sdhci_acpi sdhci video i2c_hid hid
[    3.856236] CPU: 0 PID: 343 Comm: plymouthd Tainted: G        W
4.2.0-18-generic #22-Ubuntu
[    3.856237] Hardware name: Dell Inc. Latitude E7440/07F3F4, BIOS A16
09/01/2015
[    3.856237]  0000000000000000 000000008b6d1e83 ffff8804096337c8
ffffffff817e8c09
[    3.856239]  0000000000000000 ffff880409633820 ffff880409633808
ffffffff8107b3c6
[    3.856240]  ffff880409633848 ffff8804096338b0 ffff8800d9fe8000
0000000000000001
[    3.856242] Call Trace:
[    3.856244]  [<ffffffff817e8c09>] dump_stack+0x45/0x57
[    3.856248]  [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
[    3.856249]  [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
[    3.856257]  [<ffffffffc0225bc1>] ?
intel_pipe_config_compare+0xb31/0xc60 [i915]
[    3.856264]  [<ffffffffc0225fb5>] check_crtc_state+0x2c5/0x440 [i915]
[    3.856274]  [<ffffffffc0239d6d>] intel_modeset_check_state+0x21d/0x6d0
[i915]
[    3.856282]  [<ffffffffc023af27>] intel_crtc_set_config+0x4c7/0x580
[i915]
[    3.856290]  [<ffffffffc008bee5>] ? drm_mode_create+0x25/0x60 [drm]
[    3.856296]  [<ffffffffc00854c6>]
drm_mode_set_config_internal+0x66/0x100 [drm]
[    3.856302]  [<ffffffffc0089b29>] drm_mode_setcrtc+0x3e9/0x500 [drm]
[    3.856306]  [<ffffffffc007a495>] drm_ioctl+0x125/0x610 [drm]
[    3.856312]  [<ffffffffc0089740>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
[    3.856314]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
[    3.856316]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
[    3.856318]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[    3.856319] ---[ end trace 95944ca887982c30 ]---
[    3.860245] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[    3.933412] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[    4.087004] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in
ips_enabled (expected 1, found 0)
[    4.087008] ------------[ cut here ]------------
[    4.087019] WARNING: CPU: 2 PID: 934 at
/build/linux-jJX2Dm/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326
check_crtc_state+0x2c5/0x440 [i915]()
[    4.087020] pipe state doesn't match!
[    4.087021] Modules linked in: bnep binfmt_misc arc4 pn544_mei mei_phy
pn544 hci dell_laptop dcdbas nfc dell_smm_hwmon dell_wmi sparse_keymap
intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp btusb
kvm_intel btrtl btbcm btintel kvm bluetooth uvcvideo videobuf2_vmalloc
crct10dif_pclmul videobuf2_memops crc32_pclmul videobuf2_core
ghash_clmulni_intel v4l2_common cdc_mbim videodev cdc_wdm cdc_ncm media
iwlmvm qcserial usbnet usb_wwan mii usbserial mac80211 aesni_intel
aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_hda_codec_hdmi
snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel input_leds
serio_raw snd_hda_codec iwlwifi snd_hda_core snd_hwdep lpc_ich cfg80211
snd_soc_rt5640 snd_soc_rl6231 snd_soc_core snd_compress ac97_bus
snd_pcm_dmaengine mei_me snd_pcm shpchp
[    4.087052]  mei snd_seq_midi joydev snd_seq_midi_event snd_rawmidi
8250_fintek snd_seq dell_smo8800 snd_seq_device snd_timer dw_dmac
dw_dmac_core snd_soc_sst_acpi snd soundcore dell_rbtn 8250_dw
i2c_designware_platform i2c_designware_core spi_pxa2xx_platform mac_hid
parport_pc ppdev lp parport autofs4 uas usb_storage i915 psmouse
i2c_algo_bit sdhci_pci ahci drm_kms_helper e1000e libahci drm ptp pps_core
wmi sdhci_acpi sdhci video i2c_hid hid
[    4.087072] CPU: 2 PID: 934 Comm: Xorg Tainted: G        W
4.2.0-18-generic #22-Ubuntu
[    4.087073] Hardware name: Dell Inc. Latitude E7440/07F3F4, BIOS A16
09/01/2015
[    4.087075]  0000000000000000 00000000fdec4985 ffff88040963b7c8
ffffffff817e8c09
[    4.087077]  0000000000000000 ffff88040963b820 ffff88040963b808
ffffffff8107b3c6
[    4.087078]  ffff88040963b848 ffff88040963b8b0 ffff8800d9fe8000
0000000000000001
[    4.087080] Call Trace:
[    4.087084]  [<ffffffff817e8c09>] dump_stack+0x45/0x57
[    4.087088]  [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
[    4.087090]  [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
[    4.087100]  [<ffffffffc0225bc1>] ?
intel_pipe_config_compare+0xb31/0xc60 [i915]
[    4.087108]  [<ffffffffc0225fb5>] check_crtc_state+0x2c5/0x440 [i915]
[    4.087120]  [<ffffffffc0239d6d>] intel_modeset_check_state+0x21d/0x6d0
[i915]
[    4.087130]  [<ffffffffc023af27>] intel_crtc_set_config+0x4c7/0x580
[i915]
[    4.087140]  [<ffffffffc008bee5>] ? drm_mode_create+0x25/0x60 [drm]
[    4.087148]  [<ffffffffc00854c6>]
drm_mode_set_config_internal+0x66/0x100 [drm]
[    4.087155]  [<ffffffffc0089b29>] drm_mode_setcrtc+0x3e9/0x500 [drm]
[    4.087160]  [<ffffffffc007a495>] drm_ioctl+0x125/0x610 [drm]
[    4.087167]  [<ffffffffc0089740>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
[    4.087170]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
[    4.087172]  [<ffffffff81087f61>] ? __set_task_blocked+0x41/0xa0
[    4.087174]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
[    4.087176]  [<ffffffff8108ab8e>] ? SyS_rt_sigprocmask+0x8e/0xc0
[    4.087179]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
[    4.087180] ---[ end trace 95944ca887982c31 ]---
[


On 6 November 2015 at 00:04, Joseph Salisbury <
<email address hidden>> wrote:

> Did this issue start happening after an update/upgrade?  Was there a
> prior kernel version where you were not having this particular problem?
>
> Would it be possible for you to test the latest upstream kernel? Refer
> to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
> v4.3 kernel[0].
>
> If this bug is fixed in the mainline kernel, please add the following
> tag 'kernel-fixed-upstream'.
>
> If the mainline kernel does not fix this bug, please add the tag:
> 'kernel-bug-exists-upstream'.
>
> Once testing of the upstream kernel is complete, please mark this bug as
> "Confirmed".
>
>
> Thanks in advance.
>
> [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-unstable/
>
> ** Changed in: linux (Ubuntu)
>    Importance: Undecided => Medium
>
> ** Changed in: linux (Ubuntu)
>        Status: Confirmed => Incomplete
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1513648
>
> Title:
>   [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled
>   (expected 1, found 0)
>
> Status in linux package in Ubuntu:
>   Incomplete
>
> Bug description:
>   A few seconds after boot I get this message in the log (and wifi does
>   not activate).
>
>   Many things still work, but the system acts a bit confused. Sometimes
>   it gets almost unsusable until reboot (and then there are more of
>   those "cut here" sections in the log).
>
>   Kind regards,
>     Patrik
>
>
>   [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled
> (expected 1, found 0)
>    ------------[ cut here ]------------
>   [    6.549187] WARNING: CPU: 2 PID: 1048 at
> /build/linux-AxjFAn/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326
> check_crtc_state+0x2c5/0x440 [i915]()
>   [    6.549188] pipe state doesn't match!
>   [    6.549189] Modules linked in: iptable_filter ip_tables x_tables
> pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) binfmt_misc
> bnep pn544_mei mei_phy pn544 hci nfc arc4 dell_wmi joydev btusb btrtl btbcm
> sparse_keymap btintel bluetooth dell_laptop dcdbas dell_smm_hwmon uvcvideo
> videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev
> media intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp
> kvm_intel kvm snd_soc_rt5640 iwlmvm snd_soc_rl6231 mac80211 snd_soc_core
> snd_compress snd_hda_codec_hdmi crct10dif_pclmul ac97_bus crc32_pclmul
> snd_pcm_dmaengine ghash_clmulni_intel snd_hda_codec_realtek
> snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep
> aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd iwlwifi
> snd_pcm input_leds serio_raw
>   [    6.549234]  cfg80211 lpc_ich snd_seq_midi snd_seq_midi_event shpchp
> mei_me mei snd_rawmidi snd_seq snd_seq_device snd_timer snd 8250_fintek
> soundcore dw_dmac dw_dmac_core dell_smo8800 snd_soc_sst_acpi 8250_dw
> dell_rbtn i2c_designware_platform i2c_designware_core spi_pxa2xx_platform
> mac_hid cdc_mbim qcserial cdc_wdm cdc_ncm usb_wwan usbnet mii usbserial
> parport_pc ppdev lp parport autofs4 uas usb_storage i915 i2c_algo_bit
> psmouse drm_kms_helper e1000e drm ahci libahci ptp sdhci_pci pps_core wmi
> sdhci_acpi video sdhci i2c_hid hid
>   [    6.549269] CPU: 2 PID: 1048 Comm: Xorg Tainted: G        W  OE
>  4.2.0-16-generic #19-Ubuntu
>   [    6.549270] Hardware name: Dell Inc. Latitude E7440/07F3F4, BIOS A09
> 05/01/2014
>   [    6.549272]  0000000000000000 000000002ecf7f35 ffff880409e337c8
> ffffffff817e8c09
>   [    6.549275]  0000000000000000 ffff880409e33820 ffff880409e33808
> ffffffff8107b3c6
>   [    6.549278]  ffff880409e33848 ffff880409e338b0 ffff8804072d6800
> 0000000000000001
>   [    6.549280] Call Trace:
>   [    6.549286]  [<ffffffff817e8c09>] dump_stack+0x45/0x57
>   [    6.549291]  [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
>   [    6.549293]  [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
>   [    6.549308]  [<ffffffffc0225bc1>] ?
> intel_pipe_config_compare+0xb31/0xc60 [i915]
>   [    6.549320]  [<ffffffffc0225fb5>] check_crtc_state+0x2c5/0x440 [i915]
>   [    6.549336]  [<ffffffffc0239d6d>]
> intel_modeset_check_state+0x21d/0x6d0 [i915]
>   [    6.549350]  [<ffffffffc023af27>] intel_crtc_set_config+0x4c7/0x580
> [i915]
>   [    6.549364]  [<ffffffffc00b6ee5>] ? drm_mode_create+0x25/0x60 [drm]
>   [    6.549374]  [<ffffffffc00b04c6>]
> drm_mode_set_config_internal+0x66/0x100 [drm]
>   [    6.549384]  [<ffffffffc00b4b29>] drm_mode_setcrtc+0x3e9/0x500 [drm]
>   [    6.549392]  [<ffffffffc00a5495>] drm_ioctl+0x125/0x610 [drm]
>   [    6.549400]  [<ffffffffc00b4740>] ? drm_mode_setplane+0x1b0/0x1b0
> [drm]
>   [    6.549404]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
>   [    6.549407]  [<ffffffff81087f61>] ? __set_task_blocked+0x41/0xa0
>   [    6.549410]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
>   [    6.549413]  [<ffffffff8108ab8e>] ? SyS_rt_sigprocmask+0x8e/0xc0
>   [    6.549416]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
>   [    6.549418] ---[ end trace 5a9f3f63db8e3888 ]---
>
>   ProblemType: Bug
>   DistroRelease: Ubuntu 15.10
>   Package: linux-image-4.2.0-16-generic 4.2.0-16.19
>   ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
>   Uname: Linux 4.2.0-16-generic x86_64
>   ApportVersion: 2.19.1-0ubuntu4
>   Architecture: amd64
>   AudioDevicesInUse:
>    USER        PID ACCESS COMMAND
>    /dev/snd/controlC0:  patrikj    1724 F.... pulseaudio
>    /dev/snd/controlC1:  patrikj    1724 F.... pulseaudio
>   CurrentDesktop: Unity
>   Date: Thu Nov  5 23:43:28 2015
>   HibernationDevice: RESUME=UUID=2c948eae-cab3-47b5-a293-ceefec2af360
>   InstallationDate: Installed on 2014-10-14 (387 days ago)
>   InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64
> (20140722.2)
>   MachineType: Dell Inc. Latitude E7440
>   ProcFB: 0 inteldrmfb
>   ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic
> root=UUID=a8c1bdf4-4a10-4923-be0e-03d7148a6b88 ro quiet splash vt.handoff=7
>   RelatedPackageVersions:
>    linux-restricted-modules-4.2.0-16-generic N/A
>    linux-backports-modules-4.2.0-16-generic  N/A
>    linux-firmware                            1.149
>   SourcePackage: linux
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 05/01/2014
>   dmi.bios.vendor: Dell Inc.
>   dmi.bios.version: A09
>   dmi.board.name: 07F3F4
>   dmi.board.vendor: Dell Inc.
>   dmi.board.version: A00
>   dmi.chassis.type: 9
>   dmi.chassis.vendor: Dell Inc.
>   dmi.modalias:
> dmi:bvnDellInc.:bvrA09:bd05/01/2014:svnDellInc.:pnLatitudeE7440:pvr01:rvnDellInc.:rn07F3F4:rvrA00:cvnDellInc.:ct9:cvr:
>   dmi.product.name: Latitude E7440
>   dmi.product.version: 01
>   dmi.sys.vendor: Dell Inc.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1513648/+subscriptions
>