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[Visi Bilius <visibilius@xxxxxxxxx>]

I just upgraded to 15.10. The provided kernel, 4.2.0-16-generic, works
fine so far. If the warning happens to come, it must come very rarely.

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https://bugs.launchpad.net/bugs/1505242

Title:
  WARNING: ... intel_display.c:11100 intel_check_page_flip

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I see warnings similar to this occasionally in the dmesg output.
  I first noticed it, when the system refused to put load on all but one core, and I tried to find the reason.
  But it happened again a few times, and I did not notice that effect (or any).
  I do not know the trigger. I suspect playing video.
  This is a fresh install of Ubuntu 15.04 on a fresh hardware.

  I found several similar error reports with google. All appeared to be unsolved.
  I thought, I submit this report, anyway. Perhaps it provides some new information.

  [ 5967.045926] ------------[ cut here ]------------
  [ 5967.045949] WARNING: CPU: 3 PID: 0 at /build/linux-qOmAV7/linux-3.19.0/ubuntu/i915/intel_display.c:11100 intel_check_page_flip+0x11c/0x130 [i915_bpo]()
  [ 5967.045950] Kicking stuck page flip: queued at 343930, now 343934
  [ 5967.045951] Modules linked in: cfg80211 binfmt_misc dm_crypt nls_iso8859_1 snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel eeepc_wmi snd_hda_controller asus_wmi sparse_keymap snd_hda_codec snd_usb_audio snd_usbmidi_lib snd_hwdep x86_pkg_temp_thermal snd_pcm coretemp kvm_intel kvm snd_seq_midi snd_seq_midi_event crct10dif_pclmul snd_rawmidi ip6t_REJECT nf_reject_ipv6 crc32_pclmul ghash_clmulni_intel nf_log_ipv6 snd_seq uvcvideo aesni_intel videobuf2_vmalloc videobuf2_memops snd_seq_device aes_x86_64 videobuf2_core lrw xt_hl gf128mul v4l2_common glue_helper hid_multitouch videodev ablk_helper ip6t_rt cryptd snd_timer media snd joydev serio_raw i915_bpo nf_conntrack_ipv6 soundcore nf_defrag_ipv6 intel_ips drm_kms_helper ipt_REJECT nf_reject_ipv4 drm 8250_fintek nf_log_ipv4
  [ 5967.045968]  nf_log_common i2c_algo_bit i2c_hid shpchp xt_LOG mac_hid acpi_pad 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 btrfs xor raid6_pq hid_generic usbhid hid mxm_wmi e1000e psmouse ptp pps_core ahci libahci wmi video
  [ 5967.045984] CPU: 3 PID: 0 Comm: swapper/3 Not tainted 3.19.0-30-generic #34-Ubuntu
  [ 5967.045985] Hardware name: System manufacturer System Product Name/Z170-A, BIOS 0502 07/14/2015
  [ 5967.045986]  ffffffffc076c138 ffff88046ed83d68 ffffffff817c4d5f 0000000000000007
  [ 5967.045987]  ffff88046ed83db8 ffff88046ed83da8 ffffffff81076a8a ffff88046ed83db8
  [ 5967.045988]  ffff88045ac18800 ffff880456f46000 ffff88045ac189a8 0000000000000000
  [ 5967.045990] Call Trace:
  [ 5967.045991]  <IRQ>  [<ffffffff817c4d5f>] dump_stack+0x45/0x57
  [ 5967.045997]  [<ffffffff81076a8a>] warn_slowpath_common+0x8a/0xc0
  [ 5967.045999]  [<ffffffff81076b06>] warn_slowpath_fmt+0x46/0x50
  [ 5967.046011]  [<ffffffffc07112ec>] intel_check_page_flip+0x11c/0x130 [i915_bpo]
  [ 5967.046021]  [<ffffffffc06d821e>] gen8_irq_handler+0x37e/0x5d0 [i915_bpo]
  [ 5967.046023]  [<ffffffff8101e289>] ? read_tsc+0x9/0x10
  [ 5967.046026]  [<ffffffff810cea87>] handle_irq_event_percpu+0x77/0x1a0
  [ 5967.046027]  [<ffffffff810cebf1>] handle_irq_event+0x41/0x70
  [ 5967.046029]  [<ffffffff810d1c5e>] handle_edge_irq+0x6e/0x120
  [ 5967.046031]  [<ffffffff81017772>] handle_irq+0x22/0x40
  [ 5967.046033]  [<ffffffff817cee1f>] do_IRQ+0x4f/0xf0
  [ 5967.046034]  [<ffffffff817ccc2d>] common_interrupt+0x6d/0x6d
  [ 5967.046035]  <EOI>  [<ffffffff8109f117>] ? finish_task_switch+0x67/0x150
  [ 5967.046039]  [<ffffffff817c6fac>] __schedule+0x39c/0x8e0
  [ 5967.046041]  [<ffffffff817c7a69>] schedule_preempt_disabled+0x29/0x70
  [ 5967.046043]  [<ffffffff810b7bc7>] cpu_startup_entry+0x187/0x3b0
  [ 5967.046045]  [<ffffffff81049117>] start_secondary+0x197/0x1c0
  [ 5967.046046] ---[ end trace 6b6de72fa2c286b6 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-30-generic 3.19.0-30.34
  ProcVersionSignature: Ubuntu 3.19.0-30.34-generic 3.19.8-ckt6
  Uname: Linux 3.19.0-30-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  lacko      1507 F.... pulseaudio
   /dev/snd/controlC0:  lacko      1507 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Oct 12 15:05:50 2015
  InstallationDate: Installed on 2015-10-10 (2 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: System manufacturer System Product Name
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.19.0-30-generic.efi.signed root=/dev/mapper/ubuntu_ssd1-ubuntu_root ro rootflags=subvol=@ quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-30-generic N/A
   linux-backports-modules-3.19.0-30-generic  N/A
   linux-firmware                             1.143.3
  RfKill:
   
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/14/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0502
  dmi.board.asset.tag: Default string
  dmi.board.name: Z170-A
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev 1.xx
  dmi.chassis.asset.tag: Default string
  dmi.chassis.type: 3
  dmi.chassis.vendor: Default string
  dmi.chassis.version: Default string
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0502:bd07/14/2015:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ170-A:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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