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[Sergey Galkin <sgalkin@xxxxxxxxxxxx>]

may be this help 
reproduced on 4.2.1, 4.2.3 kernel but on gentoo :)

[    5.841753] [drm:check_crtc_state] *ERROR* mismatch in dpll_hw_state.wrpll (expected 0xb0210614, found 0x00000000)
[    5.842534] ------------[ cut here ]------------
[    5.843242] WARNING: CPU: 2 PID: 545 at drivers/gpu/drm/i915/intel_display.c:12324 check_crtc_state+0x86d/0xf90()
[    5.843960] pipe state doesn't match!
[    5.844670] Modules linked in: bridge stp llc snd_usb_audio snd_usbmidi_lib snd_rawmidi snd_hda_codec_realtek snd_hda_codec_generic intel_rapl snd_hda_codec_hdmi iosf_mbi x86_pkg_temp_thermal input_leds led_class snd_hda_intel snd_hda_codec snd_hwdep snd_hda_core snd_pcm snd_timer crc32c_intel ghash_clmulni_intel aesni_intel aes_x86_64 glue_helper lrw gf128mul ablk_helper cryptd
[    5.846294] CPU: 2 PID: 545 Comm: X Tainted: G        W       4.2.3-gentoo #1
[    5.847101] Hardware name: ASUS All Series/B85M-E, BIOS 0806 02/20/2014
[    5.847905]  0000000000000000 ffffffff81a1f318 ffffffff81768b3c ffff880405363918
[    5.848723]  ffffffff8109435c ffff8800d64e3000 ffff88040a302000 ffff8800d7c20000
[    5.849542]  0000000000000001 ffff88040a302350 ffffffff810943d5 ffffffff819f89d4
[    5.850351] Call Trace:
[    5.851152]  [<ffffffff81768b3c>] ? dump_stack+0x40/0x50
[    5.851951]  [<ffffffff8109435c>] ? warn_slowpath_common+0x7c/0xb0
[    5.852740]  [<ffffffff810943d5>] ? warn_slowpath_fmt+0x45/0x50
[    5.853527]  [<ffffffff8149bccd>] ? check_crtc_state+0x86d/0xf90
[    5.853529]  [<ffffffff8147915a>] ? i915_get_crtc_scanoutpos+0x18a/0x230
[    5.853531]  [<ffffffff814ae976>] ? intel_modeset_check_state+0x206/0xb00
[    5.853532]  [<ffffffff814affd9>] ? intel_crtc_set_config+0x529/0x590
[    5.853535]  [<ffffffff8141b15e>] ? drm_atomic_helper_plane_set_property+0x7e/0xc0
[    5.853537]  [<ffffffff8142e009>] ? drm_mode_set_config_internal+0x59/0xf0
[    5.853539]  [<ffffffff8141cf32>] ? restore_fbdev_mode+0xb2/0xd0
[    5.853539]  [<ffffffff8141ec0b>] ? drm_fb_helper_restore_fbdev_mode_unlocked+0x1b/0x60
[    5.853541]  [<ffffffff814bea39>] ? intel_fbdev_restore_mode+0x19/0x50
[    5.853543]  [<ffffffff81422888>] ? drm_lastclose+0x28/0x140
[    5.853544]  [<ffffffff81422cac>] ? drm_release+0x30c/0x4f0
[    5.853546]  [<ffffffff8119f7c7>] ? __fput+0xc7/0x1d0
[    5.853548]  [<ffffffff810acf5f>] ? task_work_run+0x7f/0xb0
[    5.853549]  [<ffffffff8104b7fe>] ? do_notify_resume+0x4e/0x70
[    5.853551]  [<ffffffff8176f67c>] ? int_signal+0x12/0x17
[    5.853552] ---[ end trace d1cdcf9ea2c0170b ]---

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https://bugs.launchpad.net/bugs/1501260

Title:
  drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in
  dpll_hw_state.wrpll (expected 0xb0210614, found 0x00000000

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  While surfing, I clicked on something,, X died, I was thrown back to a console and finally was able to log back in.
  dmesg is cluttered with:
   

  
  [79849.958943] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in dpll_hw_state.wrpll (expected 0xb0210614, found 0x00000000)
  [79849.958944] ------------[ cut here ]------------
  [79849.958962] WARNING: CPU: 0 PID: 14689 at /build/linux-1dujk3/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]()
  [79849.958963] pipe state doesn't match!
  [79849.958981] Modules linked in: bnep bluetooth binfmt_misc nls_iso8859_1 intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_hdmi coretemp snd_hda_codec_realtek input_leds snd_hda_codec_generic kvm_intel snd_hda_intel kvm snd_hda_codec snd_hda_core snd_hwdep snd_pcm crct10dif_pclmul snd_seq_midi snd_seq_midi_event snd_rawmidi crc32_pclmul ghash_clmulni_intel snd_seq snd_seq_device snd_timer mei_me aesni_intel snd mei aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd soundcore serio_raw 8250_fintek fujitsu_laptop lpc_ich tpm_infineon mac_hid parport_pc ppdev lp parport autofs4 hid_generic usbhid hid i915 psmouse ahci libahci i2c_algo_bit drm_kms_helper e1000e drm ptp pps_core video
  [79849.958983] CPU: 0 PID: 14689 Comm: Xorg Tainted: G        W       4.2.0-11-generic #13-Ubuntu
  [79849.958983] Hardware name: FUJITSU ESPRIMO E920/D3222-A1, BIOS V4.6.5.4 R1.34.0 for D3222-A1x 01/08/2015
  [79849.958985]  ffffffffc0232ab0 ffff88030edef538 ffffffff817b0cc5 0000000000000000
  [79849.958986]  ffff88030edef588 ffff88030edef578 ffffffff81076536 ffff88030edef5a8
  [79849.958986]  ffff88030edef610 ffff88030a600800 0000000000000001 ffff88030a600b50
  [79849.958987] Call Trace:
  [79849.958991]  [<ffffffff817b0cc5>] dump_stack+0x45/0x57
  [79849.958994]  [<ffffffff81076536>] warn_slowpath_common+0x86/0xc0
  [79849.958995]  [<ffffffff810765b6>] warn_slowpath_fmt+0x46/0x50
  [79849.959008]  [<ffffffffc01c5327>] ? intel_pipe_config_compare+0xa67/0xc60 [i915]
  [79849.959015]  [<ffffffffc01c57e5>] check_crtc_state+0x2c5/0x440 [i915]
  [79849.959024]  [<ffffffffc01d92fe>] intel_modeset_check_state+0x20e/0x6b0 [i915]
  [79849.959032]  [<ffffffffc01da4a7>] intel_crtc_set_config+0x4c7/0x580 [i915]
  [79849.959042]  [<ffffffffc0033036>] drm_mode_set_config_internal+0x66/0x100 [drm]
  [79849.959045]  [<ffffffffc00f23b2>] restore_fbdev_mode+0xc2/0xf0 [drm_kms_helper]
  [79849.959048]  [<ffffffffc00f4239>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x70 [drm_kms_helper]
  [79849.959050]  [<ffffffffc00f42a2>] drm_fb_helper_set_par+0x22/0x40 [drm_kms_helper]
  [79849.959060]  [<ffffffffc01e76da>] intel_fbdev_set_par+0x1a/0x60 [i915]
  [79849.959062]  [<ffffffff8109e4ad>] ? ttwu_do_activate.constprop.89+0x5d/0x70
  [79849.959064]  [<ffffffff814262a8>] fb_set_var+0x238/0x460
  [79849.959066]  [<ffffffff81201da7>] ? do_sys_poll+0x127/0x5a0
  [79849.959068]  [<ffffffff8141ca59>] fbcon_blank+0x2e9/0x330
  [79849.959070]  [<ffffffff810a7e13>] ? check_preempt_wakeup+0x193/0x220
  [79849.959071]  [<ffffffff814ad2c3>] do_unblank_screen+0xd3/0x1a0
  [79849.959073]  [<ffffffff814a2adb>] vt_ioctl+0x4fb/0x12c0
  [79849.959074]  [<ffffffff8109f042>] ? default_wake_function+0x12/0x20
  [79849.959076]  [<ffffffff810b60e6>] ? autoremove_wake_function+0x16/0x40
  [79849.959078]  [<ffffffff8149601c>] tty_ioctl+0x3cc/0xbb0
  [79849.959079]  [<ffffffff810b5a88>] ? __wake_up+0x48/0x60
  [79849.959080]  [<ffffffff810d599d>] ? wake_nocb_leader+0x4d/0x50
  [79849.959081]  [<ffffffff810d5a6d>] ? __call_rcu_nocb_enqueue+0xcd/0xd0
  [79849.959083]  [<ffffffff81200075>] do_vfs_ioctl+0x285/0x470
  [79849.959084]  [<ffffffff8120ca04>] ? mntput+0x24/0x40
  [79849.959085]  [<ffffffff811ef040>] ? __fput+0x190/0x220
  [79849.959086]  [<ffffffff812002d9>] SyS_ioctl+0x79/0x90
  [79849.959088]  [<ffffffff817b7532>] entry_SYSCALL_64_fastpath+0x16/0x75
  [79849.959089] ---[ end trace c15f693470bdbc48 ]---
  [79849.959131] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in dpll_hw_state.wrpll (expected 0xb0210614, found 0x00000000)
  [79849.959131] ------------[ cut here ]------------

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-11-generic 4.2.0-11.13
  ProcVersionSignature: Ubuntu 4.2.0-11.13-generic 4.2.1
  Uname: Linux 4.2.0-11-generic x86_64
  ApportVersion: 2.19-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  hildeb    25581 F.... pulseaudio
   /dev/snd/controlC1:  hildeb    25581 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Sep 30 12:04:59 2015
  HibernationDevice: RESUME=UUID=d5037585-3853-4049-a410-b17d0c104ef3
  InstallationDate: Installed on 2014-06-19 (467 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  IwConfig:
   eth0      no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: FUJITSU ESPRIMO E920
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-11-generic.efi.signed root=UUID=e0d7cff3-bbdd-467d-b15b-fb96697320f0 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-11-generic N/A
   linux-backports-modules-4.2.0-11-generic  N/A
   linux-firmware                            1.148
  RfKill:
   
  SourcePackage: linux
  UpgradeStatus: Upgraded to wily on 2015-09-29 (0 days ago)
  dmi.bios.date: 01/08/2015
  dmi.bios.vendor: FUJITSU // American Megatrends Inc.
  dmi.bios.version: V4.6.5.4 R1.34.0 for D3222-A1x
  dmi.board.name: D3222-A1
  dmi.board.vendor: FUJITSU
  dmi.board.version: S26361-D3222-A1
  dmi.chassis.type: 3
  dmi.chassis.vendor: FUJITSU
  dmi.chassis.version: C$BK02
  dmi.modalias: dmi:bvnFUJITSU//AmericanMegatrendsInc.:bvrV4.6.5.4R1.34.0forD3222-A1x:bd01/08/2015:svnFUJITSU:pnESPRIMOE920:pvr:rvnFUJITSU:rnD3222-A1:rvrS26361-D3222-A1:cvnFUJITSU:ct3:cvrC$BK02:
  dmi.product.name: ESPRIMO E920
  dmi.sys.vendor: FUJITSU

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