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[mjh <moonbug1970@xxxxxxxxx>]

Confirmed present on 16.04 with kernel 4.4.0-22-generic, on the same hardware as my original report
Still occurs at about the same time as a Wifi dropout (which requires a reload of the wifi kernel modules to clear). Not clear which is causative of the other.

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https://bugs.launchpad.net/bugs/1525390

Title:
   [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on
  pipe A

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Dell 3552 Inspiron laptop, bought with Ubuntu 14.04LTS upgraded, to
  15.10.

  Every few minutes the following appears in the syslog:
  [ 6355.488381] [drm:intel_pipe_update_end [i915]] *ERROR* Atomic update failure on pipe A (start=1171 end=1172)

  Does not seem to be related to any specific user activity, though I note the Chrome 47 displays many graphical artifacts in images.
  Additionally, the below stack trace often appears:

  [ 1365.284232] perf interrupt took too long (2502 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
  [ 1599.998487] ------------[ cut here ]------------
  [ 1599.998536] WARNING: CPU: 0 PID: 2333 at /build/linux-26_gwp/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:11102 intel_check_page_flip+0xfc/0x110 [i915]()
  [ 1599.998539] Kicking stuck page flip: queued at 94224, now 94229
  [ 1599.998541] Modules linked in: ctr ccm ip6table_filter ip6_tables iptable_filter ip_tables x_tables pci_stub vboxpci(OE) vboxnetadp(OE) rfcomm vboxnetflt(OE) vboxdrv(OE) msr bnep binfmt_misc rtsx_usb_ms memstick snd_hda_codec_hdmi dell_led snd_hda_codec_realtek snd_hda_codec_generic btusb uvcvideo dell_wmi btrtl snd_hda_intel sparse_keymap btbcm videobuf2_vmalloc btintel videobuf2_memops snd_hda_codec videobuf2_core bluetooth v4l2_common snd_hda_core snd_hwdep arc4 videodev media snd_pcm dell_laptop dcdbas nls_iso8859_1 rtl8723be snd_seq_midi snd_seq_midi_event intel_rapl snd_rawmidi dell_smm_hwmon btcoexist rtl8723_common intel_powerclamp rtl_pci coretemp rtlwifi kvm_intel mac80211 kvm punit_atom_debug cfg80211 snd_seq input_leds joydev serio_raw snd_seq_device snd_timer lpc_ich snd mei_txe mei
  [ 1599.998609]  shpchp soundcore iosf_mbi i2c_designware_platform mac_hid i2c_designware_core dell_rbtn synaptics_i2c parport_pc ppdev lp parport autofs4 jitterentropy_rng drbg ansi_cprng algif_skcipher af_alg dm_crypt rtsx_usb_sdmmc rtsx_usb crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper i915 cryptd psmouse i2c_algo_bit drm_kms_helper drm ahci libahci wmi sdhci_acpi video sdhci pinctrl_cherryview
  [ 1599.998649] CPU: 0 PID: 2333 Comm: Chrome_IOThread Tainted: G           OE   4.2.0-19-generic #23-Ubuntu
  [ 1599.998651] Hardware name: Dell Inc. Inspiron 15-3552/0CP33T, BIOS 3.0.3 08/26/2015
  [ 1599.998654]  0000000000000000 0000000024a8568b ffff88017fc03ce8 ffffffff817e93f9
  [ 1599.998659]  0000000000000000 ffff88017fc03d40 ffff88017fc03d28 ffffffff8107b3d6
  [ 1599.998663]  ffff88017fc03d58 ffff880035904800 ffff88007777e000 ffff8800359049a8
  [ 1599.998668] Call Trace:
  [ 1599.998670]  <IRQ>  [<ffffffff817e93f9>] dump_stack+0x45/0x57
  [ 1599.998684]  [<ffffffff8107b3d6>] warn_slowpath_common+0x86/0xc0
  [ 1599.998687]  [<ffffffff8107b465>] warn_slowpath_fmt+0x55/0x70
  [ 1599.998714]  [<ffffffffc01ac92c>] intel_check_page_flip+0xfc/0x110 [i915]
  [ 1599.998736]  [<ffffffffc01713a6>] valleyview_pipestat_irq_handler+0x1f6/0x200 [i915]
  [ 1599.998759]  [<ffffffffc01758b3>] cherryview_irq_handler+0x63/0x110 [i915]
  [ 1599.998765]  [<ffffffff810d4204>] handle_irq_event_percpu+0x74/0x180
  [ 1599.998768]  [<ffffffff810d4359>] handle_irq_event+0x49/0x70
  [ 1599.998772]  [<ffffffff810d76d1>] handle_edge_irq+0x81/0x150
  [ 1599.998777]  [<ffffffff810172b5>] handle_irq+0x25/0x40
  [ 1599.998781]  [<ffffffff817f2def>] do_IRQ+0x4f/0xe0
  [ 1599.998785]  [<ffffffff817f0d6b>] common_interrupt+0x6b/0x6b
  [ 1599.998786]  <EOI>
  [ 1599.998789] ---[ end trace c4f14dcdc80fdcfe ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xorg 1:7.7+7ubuntu4
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  .tmp.unity.support.test.0:

  ApportVersion: 2.19.1-0ubuntu5
  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: Fri Dec 11 21:17:25 2015
  DistUpgraded: 2015-10-29 20:07:04,539 DEBUG enabling apt cron job
  DistroCodename: wily
  DistroVariant: ubuntu
  DkmsStatus: virtualbox, 5.0.10, 4.2.0-19-generic, x86_64: installed
  ExtraDebuggingInterest: Yes, if not too technical
  GraphicsCard:
   Intel Corporation Device [8086:22b1] (rev 21) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:06ac]
  InstallationDate: Installed on 2015-05-12 (213 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. Inspiron 15-3552
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-19-generic.efi.signed root=/dev/mapper/ubuntu--15--vg-root ro quiet splash i8042.nopnp
  SourcePackage: xorg
  Symptom: display
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-10-29 (43 days ago)
  dmi.bios.date: 08/26/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 3.0.3
  dmi.board.name: 0CP33T
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: Not Specified
  dmi.modalias: dmi:bvnDellInc.:bvr3.0.3:bd08/26/2015:svnDellInc.:pnInspiron15-3552:pvr3.0.3:rvnDellInc.:rn0CP33T:rvrA00:cvnDellInc.:ct8:cvrNotSpecified:
  dmi.product.name: Inspiron 15-3552
  dmi.product.version: 3.0.3
  dmi.sys.vendor: Dell Inc.
  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 2:1.17.2-1ubuntu9.1
  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: Fri Dec 11 19:30:09 2015
  xserver.configfile: default
  xserver.errors:

  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                5578
   vendor                                     CMN
  xserver.version: 2:1.17.2-1ubuntu9.1

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