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[Ljiljan Veselinovic <ljiljan.veselinovic@xxxxxxxxx>]

I experience similar problem but with Intel graphic card i915. And
mostly when using Google Chrome, LibreOffice or Viber. For example, I
clicked Tools -> Options in LibreOffice and I was returned to login
screen. Or I was zooming google maps... or when talking to someone on
Viber... I believe it has to do something with hardware accelerator or
openGL? (I am just an ordinary user so do not take my comments so
seriously). I noticed that LibreOffice does not allow to enable
Hardware Accelerator from time to time...

When Ubuntu 15.10 was published, this was happening more often. Now, it
happenes rarely. But unexpected.

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https://bugs.launchpad.net/bugs/1513024

Title:
  Display-server randomly crashing in Ubuntu 15.10 after upgrade

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  On: Ubuntu 15.10

  After some random amount of time (at first correlated with actions
  such as switching between screens, max-/minimising windows, but now
  also sometimes not), the display server seems to die completely,
  restarting after a few seconds to dump me at the login screen.

  Getting errors like:

  $ dmesg
  ...
  [  239.809761] WARNING: CPU: 0 PID: 1879 at /build/linux-AxjFAn/linux-4.2.0/drivers/gpu/drm/i915/i915_gem.c:5269 i915_gem_track_fb+0x129/0x140 [i915]()
  [  239.809762] WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits))
  [  239.809763] Modules linked in:
  [  239.809765]  rfcomm msr acpi_call(OE) pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) openafs(POE) binfmt_misc bnep btusb btrtl btbcm btintel bluetooth uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media arc4 intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel iwlmvm aes_x86_64 lrw gf128mul glue_helper mac80211 ablk_helper cryptd joydev input_leds snd_seq_midi serio_raw snd_seq_midi_event snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi thinkpad_acpi snd_rawmidi nvram iwlwifi snd_seq snd_hda_intel rtsx_pci_ms memstick snd_hda_codec lpc_ich cfg80211 snd_hda_core snd_hwdep snd_pcm mei_me ie31200_edac mei snd_seq_device edac_core shpchp snd_timer snd soundcore
  [  239.809798]  ip6t_REJECT nf_reject_ipv6 nf_log_ipv6 mac_hid xt_hl ip6t_rt nf_conntrack_ipv6 nf_defrag_ipv6 ipt_REJECT nf_reject_ipv4 nf_log_ipv4 nf_log_common xt_LOG xt_limit xt_tcpudp xt_addrtype nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ip6table_filter ip6_tables nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_nat nf_conntrack_ftp nf_conntrack iptable_filter ip_tables x_tables parport_pc ppdev lp parport autofs4 rtsx_pci_sdmmc nouveau i915 mxm_wmi ttm e1000e i2c_algo_bit psmouse ahci drm_kms_helper libahci ptp rtsx_pci pps_core drm wmi video
  [  239.809822] CPU: 0 PID: 1879 Comm: Xorg Tainted: P           OE   4.2.0-16-generic #19-Ubuntu
  [  239.809824] Hardware name: LENOVO 20AWS37E00/20AWS37E00, BIOS GLET77WW (2.31 ) 01/27/2015
  [  239.809825]  0000000000000000 000000002aa5ef7b ffff8800a922fac8 ffffffff817e8c09
  [  239.809827]  0000000000000000 ffff8800a922fb20 ffff8800a922fb08 ffffffff8107b3c6
  [  239.809829]  ffff880425a47840 0000000000000010 ffff8804256a0000 ffff8804256a0000
  [  239.809831] Call Trace:
  [  239.809836]  [<ffffffff817e8c09>] dump_stack+0x45/0x57
  [  239.809841]  [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
  [  239.809843]  [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
  [  239.809853]  [<ffffffffc01e0ec9>] i915_gem_track_fb+0x129/0x140 [i915]
  [  239.809868]  [<ffffffffc0229367>] intel_prepare_plane_fb+0xe7/0x1a0 [i915]
  [  239.809874]  [<ffffffffc00c7fa9>] drm_atomic_helper_prepare_planes+0x59/0xe0 [drm_kms_helper]
  [  239.809887]  [<ffffffffc004d9d5>] ? drm_atomic_check_only+0x215/0x540 [drm]
  [  239.809901]  [<ffffffffc023a022>] intel_atomic_commit+0x42/0x100 [i915]
  [  239.809910]  [<ffffffffc004dd37>] drm_atomic_commit+0x37/0x60 [drm]
  [  239.809915]  [<ffffffffc00c9617>] drm_atomic_helper_plane_set_property+0x87/0xc0 [drm_kms_helper]
  [  239.809922]  [<ffffffffc003b759>] ? _object_find+0x69/0xa0 [drm]
  [  239.809930]  [<ffffffffc003bfdd>] drm_mode_plane_set_obj_prop+0x2d/0x90 [drm]
  [  239.809939]  [<ffffffffc0042a66>] drm_mode_obj_set_property_ioctl+0x1c6/0x270 [drm]
  [  239.809944]  [<ffffffffc0032495>] drm_ioctl+0x125/0x610 [drm]
  [  239.809947]  [<ffffffff8123e696>] ? fsnotify+0x316/0x4a0
  [  239.809954]  [<ffffffffc00428a0>] ? drm_mode_obj_get_properties_ioctl+0xa0/0xa0 [drm]
  [  239.809957]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
  [  239.809959]  [<ffffffff811ff685>] ? __sb_end_write+0x35/0x70
  [  239.809961]  [<ffffffff811fd2ba>] ? vfs_write+0x15a/0x1a0
  [  239.809963]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
  [  239.809966]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  239.809967] ---[ end trace d4f1687d97169580 ]---
  [  240.634359] nouveau E[   PIBUS][0000:02:00.0] HUB0: 0x6013d4 0xffff5704 (0x1c708200)
  [  240.634368] nouveau E[   PIBUS][0000:02:00.0] GPC0: 0x4188ac 0x00000001 (0x1c70822e)

  where the latter part also appears in the error log after xserver
  crashed, briefly visible before its restart.

  Any help is appreciated.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  NonfreeKernelModules: openafs
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Wed Nov  4 11:27:45 2015
  DistUpgraded: 2015-10-25 18:54:25,555 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 4th Gen Core Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:221d]
   NVIDIA Corporation GK208M [GeForce GT 730M] [10de:1290] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:221d]
  InstallationDate: Installed on 2015-03-09 (239 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: LENOVO 20AWS37E00
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=e63961f1-f0ea-4f12-94c7-c71dbf3f18c1 ro quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to wily on 2015-10-25 (9 days ago)
  dmi.bios.date: 01/27/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GLET77WW (2.31 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AWS37E00
  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:bvrGLET77WW(2.31):bd01/27/2015:svnLENOVO:pn20AWS37E00:pvrThinkPadT440p:rvnLENOVO:rn20AWS37E00:rvrNotDefined:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AWS37E00
  dmi.product.version: ThinkPad T440p
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.12.2+15.10.20151015-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.64-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
  version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
  xserver.bootTime: Wed Nov  4 11:24:31 2015
  xserver.configfile: default
  xserver.errors:
   Failed to load module "nvidia" (module does not exist, 0)
   Failed to load module "nvidia" (module does not exist, 0)
   NOUVEAU(G0): [XvMC] Failed to initialize extension.
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                4669 
   vendor                                     AUO
  xserver.version: 2:1.17.2-1ubuntu9

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