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[KaySL <1510970@xxxxxxxxxxxxxxxxxx>]

After a few days of this, added the xorg-edgers PPA, upgraded to the
newer packages, and I haven't had a single X server crash since. I also
installed the 4.4.0-040400rc4-generic kernel available here:
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.4-rc4-wily/ but I'm not
sure if that's required in addition to Edgers.

Disappointing that this bug remains unfixed.

-- 
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https://bugs.launchpad.net/bugs/1510970

Title:
  Intel driver crashes on Ubuntu 15.10

Status in xserver-xorg-video-intel package in Ubuntu:
  Confirmed

Bug description:
  The Xserver crashes randomly after upgrading to Ubuntu 15.10. Before
  the update everything was stable.

  The problem occured mostly while using Thunderbird but also once while
  using Firefox.

  The Xserver crashes and I'm logged out. It takes about 10 seconds
  until gdm fires up again and I'm able to login again.

  The last part of /var/log/Xorg.0.log says:
  [ 19778.602] (II) intel(0): resizing framebuffer to 3000x1920
  [ 19778.617] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI2 using pipe 1, position (0, 0), rotation left, reflection none
  [ 19778.623] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI1 using pipe 0, position (1080, 406), rotation normal, reflection none
  [ 19798.610] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI1 using pipe 0, position (1080, 502), rotation normal, reflection none
  [ 20012.432] (EE) 
  [ 20012.432] (EE) Backtrace:
  [ 20012.433] (EE) 0: /usr/bin/X (xorg_backtrace+0x4e) [0x55cab7c8f62e]
  [ 20012.433] (EE) 1: /usr/bin/X (0x55cab7adb000+0x1b8999) [0x55cab7c93999]
  [ 20012.433] (EE) 2: /lib/x86_64-linux-gnu/libc.so.6 (0x7fe7c651d000+0x352f0) [0x7fe7c65522f0]
  [ 20012.433] (EE) 3: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x24f18) [0x7fe7c2918f18]
  [ 20012.433] (EE) 4: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x26157) [0x7fe7c291a157]
  [ 20012.433] (EE) 5: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x2b4b1) [0x7fe7c291f4b1]
  [ 20012.433] (EE) 6: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x804e4) [0x7fe7c29744e4]
  [ 20012.433] (EE) 7: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x80e2c) [0x7fe7c2974e2c]
  [ 20012.433] (EE) 8: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x82e1a) [0x7fe7c2976e1a]
  [ 20012.433] (EE) 9: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x4197c) [0x7fe7c293597c]
  [ 20012.433] (EE) 10: /usr/lib/xorg/modules/drivers/intel_drv.so (0x7fe7c28f4000+0x59906) [0x7fe7c294d906]
  [ 20012.433] (EE) 11: /usr/bin/X (_CallCallbacks+0x34) [0x55cab7b38654]
  [ 20012.433] (EE) 12: /usr/bin/X (WriteToClient+0x244) [0x55cab7c93274]
  [ 20012.433] (EE) 13: /usr/bin/X (WriteEventsToClient+0x1e2) [0x55cab7b3e502]
  [ 20012.433] (EE) 14: /usr/bin/X (0x55cab7adb000+0xf495a) [0x55cab7bcf95a]
  [ 20012.433] (EE) 15: /usr/bin/X (0x55cab7adb000+0xf5ef5) [0x55cab7bd0ef5]
  [ 20012.433] (EE) 16: /usr/bin/X (0x55cab7adb000+0x5818f) [0x55cab7b3318f]
  [ 20012.433] (EE) 17: /usr/bin/X (0x55cab7adb000+0x5c34b) [0x55cab7b3734b]
  [ 20012.433] (EE) 18: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf0) [0x7fe7c653da40]
  [ 20012.433] (EE) 19: /usr/bin/X (_start+0x29) [0x55cab7b216c9]
  [ 20012.433] (EE) 
  [ 20012.433] (EE) Segmentation fault at address 0x0
  [ 20012.433] (EE) 
  Fatal server error:
  [ 20012.433] (EE) Caught signal 11 (Segmentation fault). Server aborting
  [ 20012.433] (EE) 
  [ 20012.433] (EE) 
  Please consult the The X.Org Foundation support 
           at http://wiki.x.org
   for help. 
  [ 20012.433] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
  [ 20012.433] (EE) 
  [ 20012.433] (II) AIGLX: Suspending AIGLX clients for VT switch
  [ 20012.456] (EE) Server terminated with error (1). Closing log file.

  These parts of dmesg might be interesting:
  [    1.661760] input: Logitech USB Keyboard as /devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1.6/3-1.6:1.1/0003:046D:C31C.0003/input/input8
  [    1.714657] hid-generic 0003:046D:C31C.0003: input,hidraw2: USB HID v1.10 Device [Logitech USB Keyboard] on usb-0000:00:1a.0-1.6/input1
  [    2.530993] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder A
  [    2.531006] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun
  [    2.531018] [drm:intel_set_pch_fifo_underrun_reporting [i915]] *ERROR* uncleared pch fifo underrun on pch transcoder B
  [    2.531026] [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder B FIFO underrun
  [    2.561370] EXT4-fs (sda6): mounted filesystem with ordered data mode. Opts: (null)
  [    2.586624] clocksource: Switched to clocksource tsc
  [    2.652818] systemd[1]: Failed to insert module 'kdbus': Function not implemented
  [    2.658814] systemd[1]: systemd 225 running in system mode. (+PAM +AUDIT +SELINUX +IMA +APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ -LZ4 +SECCOMP +BLKID -ELFUTILS +KMOD -IDN)
  [    2.658922] systemd[1]: Detected architecture x86-64.

  [  626.810377] audit_printk_skb: 45 callbacks suppressed
  [  626.810379] audit: type=1400 audit(1446023055.661:26): apparmor="STATUS" operation="profile_replace" profile="unconfined" name="/usr/sbin/ntpd" pid=7632 comm="apparmor_parser"
  [ 1472.735741] perf interrupt took too long (2516 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
  [18181.742252] perf interrupt took too long (5015 > 5000), lowering kernel.perf_event_max_sample_rate to 25000
  [20027.083426] QXcbEventReader[6871]: segfault at 7f9ae83f1a39 ip 00007f9ae83f1a39 sp 00007f9ae5ea9de0 error 14 in locale-archive[7f9ae847f000+443000]
  --- 
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  BootLog:
   fsck from util-linux 2.26.2
   /dev/sda6: clean, 494071/6750208 files, 11149720/26982656 blocks
  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
  DistUpgraded: 2015-10-27 12:01:00,814 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroRelease: Ubuntu 15.10
  DistroVariant: ubuntu
  DkmsStatus:
   virtualbox, 5.0.4, 3.19.0-31-generic, x86_64: installed
   virtualbox, 5.0.4, 4.2.0-16-generic, x86_64: installed
  EcryptfsInUse: Yes
  ExtraDebuggingInterest: Yes, including running git bisection searches
  GraphicsCard:
   Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller [8086:0152] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Gigabyte Technology Co., Ltd Device [1458:d000]
  InstallationDate: Installed on 2015-04-01 (211 days ago)
  InstallationMedia: Ubuntu 14.04.2 LTS "Trusty Tahr" - Release amd64 (20150218.1)
  MachineType: Gigabyte Technology Co., Ltd. To be filled by O.E.M.
  Package: xorg 1:7.7+7ubuntu4
  PackageArchitecture: amd64
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-16-generic root=UUID=b514c962-608b-4d57-950b-e56f54b6ff34 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Tags:  wily ubuntu compiz-0.9
  Uname: Linux 4.2.0-16-generic x86_64
  UpgradeStatus: Upgraded to wily on 2015-10-27 (2 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 01/06/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F17b
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: Z77MX-D3H
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF17b:bd01/06/2014:svnGigabyteTechnologyCo.,Ltd.:pnTobefilledbyO.E.M.:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnZ77MX-D3H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To be filled by O.E.M.
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.
  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: Thu Oct 29 10:20:34 2015
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   
  xserver.version: 2:1.17.2-1ubuntu9

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