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["claudio@ubuntu" <1492764@xxxxxxxxxxxxxxxxxx>]

I noticed this syslog output just before the crash:
Oct 28 21:31:35 bologna lightdm[1388]: X Error of failed request:  BadValue (integer parameter out of range for operation)
Oct 28 21:31:35 bologna lightdm[1388]: Major opcode of failed request:  140 (RANDR)
Oct 28 21:31:35 bologna lightdm[1388]: Minor opcode of failed request:  35 (RRSetProviderOutputSource)
Oct 28 21:31:35 bologna lightdm[1388]: Value in failed request:  0x46
Oct 28 21:31:35 bologna lightdm[1388]: Serial number of failed request:  15
Oct 28 21:31:35 bologna lightdm[1388]: Current serial number in output stream:  16
Oct 28 21:31:36 bologna kernel: [ 6870.862956] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
Oct 28 21:31:36 bologna kernel: [ 6870.862960] ------------[ cut here ]------------
Oct 28 21:31:36 bologna kernel: [ 6870.862975] WARNING: CPU: 3 PID: 7966 at /build/linux-AxjFAn/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]()
Oct 28 21:31:36 bologna kernel: [ 6870.862977] pipe state doesn't match!
Oct 28 21:31:36 bologna kernel: [ 6870.862978] Modules linked in: rfcomm drbg ansi_cprng ctr ccm bnep pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) nls_iso8859_1 nvidia(POE) uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common arc4 videodev media iwlmvm mac80211 btusb btr
tl btbcm btintel bluetooth hid_multitouch dell_wmi sparse_keymap iwlwifi dell_laptop dcdbas dell_smm_hwmon snd_hda_codec_hdmi intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp dell_led rtsx_pci_ms kvm_intel kvm snd_hda_codec_realtek snd_hda_codec_generic snd_soc_rt5640 snd_soc_rl6231 snd_s
oc_core snd_hda_intel crct10dif_pclmul snd_hda_codec crc32_pclmul snd_compress ghash_clmulni_intel ac97_bus snd_hda_core snd_pcm_dmaengine snd_hwdep aesni_intel aes_x86_64 snd_pcm lrw gf128mul joydev glue_helper input_leds ablk_helper snd_seq_midi cryptd snd_seq_midi_event memstick serio_raw snd_rawmidi sn
d_seq cfg80211 snd_seq_device snd_timer snd soundcore wmi i2c_designware_platform i2c_designware_core spi_pxa2xx_platform intel_smartconnect dell_smo8800 dell_rbtn 8250_dw snd_soc_sst_acpi dw_dmac dw_dmac_core mei_me shpchp mei mac_hid lpc_ich sunrpc parport_pc ppdev lp parport autofs4 hid_logitech_hidpp h
id_logitech_dj hid_generic usbhid uas usb_storage rtsx_pci_sdmmc i915 i2c_algo_bit psmouse drm_kms_helper ahci drm r8169 libahci rtsx_pci mii video sdhci_acpi i2c_hid sdhci hid
Oct 28 21:31:36 bologna kernel: [ 6870.863044] CPU: 3 PID: 7966 Comm: Xorg Tainted: P        W  OE   4.2.0-16-generic #19-Ubuntu
Oct 28 21:31:36 bologna kernel: [ 6870.863045] Hardware name: Dell Inc.          Inspiron 7537/038M0M, BIOS A12 10/30/2014
Oct 28 21:31:36 bologna kernel: [ 6870.863047]  0000000000000000 00000000e0111a78 ffff8803e5e6f7c8 ffffffff817e8c09
Oct 28 21:31:36 bologna kernel: [ 6870.863049]  0000000000000000 ffff8803e5e6f820 ffff8803e5e6f808 ffffffff8107b3c6
Oct 28 21:31:36 bologna kernel: [ 6870.863051]  ffff8803e5e6f848 ffff8803e5e6f8b0 ffff880427bc4800 0000000000000001
Oct 28 21:31:36 bologna kernel: [ 6870.863054] Call Trace:
Oct 28 21:31:36 bologna kernel: [ 6870.863059]  [<ffffffff817e8c09>] dump_stack+0x45/0x57
Oct 28 21:31:36 bologna kernel: [ 6870.863063]  [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
Oct 28 21:31:36 bologna kernel: [ 6870.863065]  [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
Oct 28 21:31:36 bologna kernel: [ 6870.863079]  [<ffffffffc01efbc1>] ? intel_pipe_config_compare+0xb31/0xc60 [i915]
Oct 28 21:31:36 bologna kernel: [ 6870.863091]  [<ffffffffc01effb5>] check_crtc_state+0x2c5/0x440 [i915]
Oct 28 21:31:36 bologna kernel: [ 6870.863106]  [<ffffffffc0203d6d>] intel_modeset_check_state+0x21d/0x6d0 [i915]
Oct 28 21:31:36 bologna kernel: [ 6870.863119]  [<ffffffffc0204f27>] intel_crtc_set_config+0x4c7/0x580 [i915]
Oct 28 21:31:36 bologna kernel: [ 6870.863131]  [<ffffffffc00bbee5>] ? drm_mode_create+0x25/0x60 [drm]
Oct 28 21:31:36 bologna kernel: [ 6870.863140]  [<ffffffffc00b54c6>] drm_mode_set_config_internal+0x66/0x100 [drm]
Oct 28 21:31:36 bologna kernel: [ 6870.863150]  [<ffffffffc00b9b29>] drm_mode_setcrtc+0x3e9/0x500 [drm]
Oct 28 21:31:36 bologna kernel: [ 6870.863156]  [<ffffffffc00aa495>] drm_ioctl+0x125/0x610 [drm]
Oct 28 21:31:36 bologna kernel: [ 6870.863159]  [<ffffffff8123e696>] ? fsnotify+0x316/0x4a0
Oct 28 21:31:36 bologna kernel: [ 6870.863167]  [<ffffffffc00b9740>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
Oct 28 21:31:36 bologna kernel: [ 6870.863171]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
Oct 28 21:31:36 bologna kernel: [ 6870.863174]  [<ffffffff81087f61>] ? __set_task_blocked+0x41/0xa0
Oct 28 21:31:36 bologna kernel: [ 6870.863176]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
Oct 28 21:31:36 bologna kernel: [ 6870.863179]  [<ffffffff8108ab8e>] ? SyS_rt_sigprocmask+0x8e/0xc0
Oct 28 21:31:36 bologna kernel: [ 6870.863183]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
Oct 28 21:31:36 bologna kernel: [ 6870.863184] ---[ end trace 4d14a9175e944d86 ]---

[more stacktraces of other CPUs]

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https://bugs.launchpad.net/bugs/1492764

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:
  System: Kubuntu 15.10

  Since kernel version 4.2 I have a few of this errors:

  Sep 06 16:16:35 benediktZ50-70 kernel: [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
  Sep 06 16:16:35 benediktZ50-70 kernel: ------------[ cut here ]------------
  Sep 06 16:16:35 benediktZ50-70 kernel: WARNING: CPU: 0 PID: 187 at /build/linux-4dBub_/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12324 check_crtc_state+0x2c5/0x440 [i915]()
  Sep 06 16:16:35 benediktZ50-70 kernel: pipe state doesn't match!
  Sep 06 16:16:35 benediktZ50-70 kernel: Modules linked in: rtsx_usb_sdmmc rtsx_usb i915 i2c_algo_bit drm_kms_helper psmouse ahci drm libahci r8169 mii sdhci_acpi video sdhci i2c_hid hid
  Sep 06 16:16:35 benediktZ50-70 kernel: CPU: 0 PID: 187 Comm: plymouthd Tainted: G        W       4.2.0-7-generic #7-Ubuntu
  Sep 06 16:16:35 benediktZ50-70 kernel: Hardware name: LENOVO 20354/Lancer 5A5, BIOS 9BCN91WW 07/21/2015
  Sep 06 16:16:35 benediktZ50-70 kernel:  ffffffffc023f1e8 ffff8802413277e8 ffffffff817b0465 0000000000000000
  Sep 06 16:16:35 benediktZ50-70 kernel:  ffff880241327838 ffff880241327828 ffffffff81076536 ffff880241327858
  Sep 06 16:16:35 benediktZ50-70 kernel:  ffff8802413278c0 ffff880241152000 0000000000000001 ffff880241152350
  Sep 06 16:16:35 benediktZ50-70 kernel: Call Trace:
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff817b0465>] dump_stack+0x45/0x57
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff81076536>] warn_slowpath_common+0x86/0xc0
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff810765b6>] warn_slowpath_fmt+0x46/0x50
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc01d3091>] ? intel_pipe_config_compare+0xb31/0xc60 [i915]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc01d3485>] check_crtc_state+0x2c5/0x440 [i915]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc01e6f3e>] intel_modeset_check_state+0x20e/0x6b0 [i915]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc01e80e7>] intel_crtc_set_config+0x4c7/0x580 [i915]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc009f915>] ? drm_mode_create+0x25/0x60 [drm]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc0099036>] drm_mode_set_config_internal+0x66/0x100 [drm]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc009d5f8>] drm_mode_setcrtc+0x3a8/0x4c0 [drm]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc008e365>] drm_ioctl+0x125/0x610 [drm]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffffc009d250>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff811fffd5>] do_vfs_ioctl+0x285/0x470
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff811ac159>] ? do_munmap+0x349/0x480
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff81200239>] SyS_ioctl+0x79/0x90
  Sep 06 16:16:35 benediktZ50-70 kernel:  [<ffffffff817b6cf2>] entry_SYSCALL_64_fastpath+0x16/0x75
  Sep 06 16:16:35 benediktZ50-70 kernel: ---[ end trace 724377a3c01e4270 ]---

  
  I will check next week if these errors have any impact on my system.

  This is a Nvidia Optimus System with the Intel graphic card activated
  by default.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-7-generic 4.2.0-7.7
  ProcVersionSignature: Ubuntu 4.2.0-7.7-generic 4.2.0
  Uname: Linux 4.2.0-7-generic x86_64
  ApportVersion: 2.18-0ubuntu9
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  benedikt   1550 F.... pulseaudio
   /dev/snd/controlC1:  benedikt   1550 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Sun Sep  6 16:22:48 2015
  HibernationDevice: UUID=3383b02e-b89c-462c-903a-cb936e81b2bf
  InstallationDate: Installed on 2014-12-21 (259 days ago)
  InstallationMedia: Kubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141218)
  MachineType: LENOVO 20354
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-7-generic root=UUID=b549945a-67ac-4d14-849c-b54e561d47cc ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-7-generic N/A
   linux-backports-modules-4.2.0-7-generic  N/A
   linux-firmware                           1.147
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/21/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 9BCN91WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Lancer 5A5
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900058WIN
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo Z50-70
  dmi.modalias: dmi:bvnLENOVO:bvr9BCN91WW:bd07/21/2015:svnLENOVO:pn20354:pvrLenovoZ50-70:rvnLENOVO:rnLancer5A5:rvr31900058WIN:cvnLENOVO:ct10:cvrLenovoZ50-70:
  dmi.product.name: 20354
  dmi.product.version: Lenovo Z50-70
  dmi.sys.vendor: LENOVO

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