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[wicklow <lduruel@xxxxxxxxxxx>]

I tested with the latest upstream kernel (v4.3-rc1-unstable) and the
problem does not occur.

In summary :

linux-image-4.1.0-3-generic (4.1.0-3.3) amd64 : Ok
linux-image-4.2.0-7-generic (4.2.0-7.7) amd64 : Not Ok (Kernel DRM stack trace mentionned in this bug report)
linux-image-4.2.0-10-generic (4.2.0-10.11) amd64 : Not Ok (Kernel DRM stack trace mentionned in this bug report)
linux-image-4.3.0-040300rc1-generic (4.3.0-040300rc1.201509160642) amd64 : Ok (Act as kernel 4.1, no DRM stack trace) 

** Tags added: kernel-fixed-upstream

** Changed in: linux (Ubuntu Wily)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1494903

Title:
  Kernel 4.2 drm/i915 erractic error

Status in linux package in Ubuntu:
  Confirmed
Status in linux source package in Wily:
  Confirmed

Bug description:
  I am encountering this following erratic error with Wily kernel 4.2.
  With Kernel, 4.1 I did not encounter such issues with drm i915.

  [ 5437.034758] ------------[ cut here ]------------
  [ 5437.034784] WARNING: CPU: 2 PID: 0 at /build/linux-4dBub_/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:11098 intel_check_page_flip+0xfc/0x110 [i915]()
  [ 5437.034785] Kicking stuck page flip: queued at 322707, now 322711
  [ 5437.034786] Modules linked in: hid_generic snd_usb_audio usbhid snd_usbmidi_lib drbg ansi_cprng ctr ccm rfcomm binfmt_misc bnep nls_iso8859_1 joydev dcdbas dell_wmi arc4 hid_multitouch sparse_keymap intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm snd_soc_rt286 snd_soc_rl6347a iwlmvm snd_soc_core crct10dif_pclmul mac80211 snd_compress ac97_bus crc32_pclmul snd_pcm_dmaengine snd_seq_midi ghash_clmulni_intel uvcvideo snd_seq_midi_event aesni_intel snd_rawmidi videobuf2_vmalloc aes_x86_64 videobuf2_memops lrw gf128mul glue_helper btusb iwlwifi ablk_helper cryptd input_leds videobuf2_core serio_raw v4l2_common dell_led btrtl videodev snd_seq snd_hda_codec_hdmi btbcm btintel snd_hda_codec_realtek media bluetooth snd_hda_codec_generic cfg80211 rtsx_pci_ms snd_hda_intel memstick snd_hda_codec
  [ 5437.034821]  snd_hda_core snd_hwdep snd_pcm lpc_ich snd_seq_device shpchp snd_timer snd soundcore soc_button_array int3403_thermal acpi_als kfifo_buf industrialio dw_dmac int3400_thermal spi_pxa2xx_platform processor_thermal_device dw_dmac_core acpi_thermal_rel snd_soc_sst_acpi intel_soc_dts_iosf 8250_dw i2c_designware_platform int3402_thermal tpm_crb iosf_mbi i2c_designware_core int340x_thermal_zone mac_hid acpi_pad parport_pc ppdev lp parport autofs4 rtsx_pci_sdmmc i915 i2c_algo_bit ahci drm_kms_helper libahci rtsx_pci drm wmi sdhci_acpi video sdhci i2c_hid hid
  [ 5437.034846] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 4.2.0-7-generic #7-Ubuntu
  [ 5437.034847] Hardware name: Dell Inc. XPS 13 9343/0TM99H, BIOS A05 07/14/2015
  [ 5437.034849]  ffffffffc02101e8 ffff88021f503d68 ffffffff817b0465 0000000000000000
  [ 5437.034851]  ffff88021f503db8 ffff88021f503da8 ffffffff81076536 ffff88021f503db8
  [ 5437.034853]  ffff880211a46800 ffff880211be3000 ffff880211a469a8 0000000000000000
  [ 5437.034855] Call Trace:
  [ 5437.034857]  <IRQ>  [<ffffffff817b0465>] dump_stack+0x45/0x57
  [ 5437.034864]  [<ffffffff81076536>] warn_slowpath_common+0x86/0xc0
  [ 5437.034866]  [<ffffffff810765b6>] warn_slowpath_fmt+0x46/0x50
  [ 5437.034882]  [<ffffffffc01b7d1c>] intel_check_page_flip+0xfc/0x110 [i915]
  [ 5437.034894]  [<ffffffffc0182749>] gen8_irq_handler+0x369/0x560 [i915]
  [ 5437.034897]  [<ffffffff810cca94>] handle_irq_event_percpu+0x74/0x180
  [ 5437.034899]  [<ffffffff810ccbe9>] handle_irq_event+0x49/0x70
  [ 5437.034902]  [<ffffffff810cfcd1>] handle_edge_irq+0x81/0x150
  [ 5437.034904]  [<ffffffff81016105>] handle_irq+0x25/0x40
  [ 5437.034906]  [<ffffffff817b98ef>] do_IRQ+0x4f/0xe0
  [ 5437.034909]  [<ffffffff817b786b>] common_interrupt+0x6b/0x6b
  [ 5437.034910]  <EOI>  [<ffffffff810df5f4>] ? enqueue_hrtimer+0x44/0x80
  [ 5437.034915]  [<ffffffff81655f10>] ? cpuidle_enter_state+0x130/0x270
  [ 5437.034917]  [<ffffffff81655eeb>] ? cpuidle_enter_state+0x10b/0x270
  [ 5437.034919]  [<ffffffff81656087>] cpuidle_enter+0x17/0x20
  [ 5437.034920]  [<ffffffff810b6422>] call_cpuidle+0x32/0x60
  [ 5437.034922]  [<ffffffff81656063>] ? cpuidle_select+0x13/0x20
  [ 5437.034923]  [<ffffffff810b66a9>] cpu_startup_entry+0x259/0x320
  [ 5437.034927]  [<ffffffff81049f04>] start_secondary+0x174/0x1a0
  [ 5437.034928] ---[ end trace 3d8fa70b3cf1a1ff ]---

  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: 2.18.1-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  loic       1504 F.... pulseaudio
   /dev/snd/controlC1:  loic       1504 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Sep 11 21:10:42 2015
  HibernationDevice: RESUME=UUID=8c8fb0c1-2656-491a-9e7c-df539df7f606
  InstallationDate: Installed on 2015-08-08 (34 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150808)
  MachineType: Dell Inc. XPS 13 9343
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-7-generic.efi.signed root=/dev/mapper/vgroot-lvroot ro priority=low i915.enable_ips=0 pcie_aspm=force radeon.modeset=0 nouveau.modeset=0 ipv6.disable=1 cgroup_disable=memory nmi_watchdog=0
  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
  UdevLog: Error: [Errno 2] Aucun fichier ou dossier de ce type: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/14/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 0TM99H
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd07/14/2015:svnDellInc.:pnXPS139343:pvr:rvnDellInc.:rn0TM99H:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: XPS 13 9343
  dmi.sys.vendor: Dell Inc.
  --- 
  ApportVersion: 2.18.1-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 15.10
  InstallationDate: Installed on 2015-08-08 (40 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150808)
  Package: linux (not installed)
  Tags:  wily
  Uname: Linux 4.3.0-040300rc1-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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