Comment 7 for bug 1501260

Same here and this error messages is repeated about 20 times. After the error my user session is logged off and login screen appears.

# uname -a
Linux lito-pc 4.2.0-19-generic #23-Ubuntu SMP Wed Nov 11 11:39:30 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

# lsb_release -a
LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch:core-4.1-amd64:core-4.1-noarch:cxx-3.0-amd64:cxx-3.0-noarch:cxx-3.1-amd64:cxx-3.1-noarch:cxx-3.2-amd64:cxx-3.2-noarch:cxx-4.0-amd64:cxx-4.0-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-3.1-amd64:desktop-3.1-noarch:desktop-3.2-amd64:desktop-3.2-noarch:desktop-4.0-amd64:desktop-4.0-noarch:desktop-4.1-amd64:desktop-4.1-noarch:graphics-2.0-amd64:graphics-2.0-noarch:graphics-3.0-amd64:graphics-3.0-noarch:graphics-3.1-amd64:graphics-3.1-noarch:graphics-3.2-amd64:graphics-3.2-noarch:graphics-4.0-amd64:graphics-4.0-noarch:graphics-4.1-amd64:graphics-4.1-noarch:languages-3.2-amd64:languages-3.2-noarch:languages-4.0-amd64:languages-4.0-noarch:languages-4.1-amd64:languages-4.1-noarch:multimedia-3.2-amd64:multimedia-3.2-noarch:multimedia-4.0-amd64:multimedia-4.0-noarch:multimedia-4.1-amd64:multimedia-4.1-noarch:printing-3.2-amd64:printing-3.2-noarch:printing-4.0-amd64:printing-4.0-noarch:printing-4.1-amd64:printing-4.1-noarch:qt4-3.1-amd64:qt4-3.1-noarch:security-4.0-amd64:security-4.0-noarch:security-4.1-amd64:security-4.1-noarch
Distributor ID: Ubuntu
Description: Ubuntu 15.10
Release: 15.10
Codename: wily

# lspci
00:00.0 Host bridge: Intel Corporation 4th Gen Core Processor DRAM Controller (rev 06)
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06)
00:03.0 Audio device: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller (rev 06)
00:14.0 USB controller: Intel Corporation 9 Series Chipset Family USB xHCI Controller
00:16.0 Communication controller: Intel Corporation 9 Series Chipset Family ME Interface #1
00:1a.0 USB controller: Intel Corporation 9 Series Chipset Family USB EHCI Controller #2
00:1b.0 Audio device: Intel Corporation 9 Series Chipset Family HD Audio Controller
00:1c.0 PCI bridge: Intel Corporation 9 Series Chipset Family PCI Express Root Port 1 (rev d0)
00:1c.2 PCI bridge: Intel Corporation 9 Series Chipset Family PCI Express Root Port 3 (rev d0)
00:1c.3 PCI bridge: Intel Corporation 9 Series Chipset Family PCI Express Root Port 4 (rev d0)
00:1d.0 USB controller: Intel Corporation 9 Series Chipset Family USB EHCI Controller #1
00:1f.0 ISA bridge: Intel Corporation 9 Series Chipset Family H97 Controller
00:1f.2 SATA controller: Intel Corporation 9 Series Chipset Family SATA Controller [AHCI Mode]
00:1f.3 SMBus: Intel Corporation 9 Series Chipset Family SMBus Controller
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
03:00.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 41)

# dmesg

[34021.224106] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in dpll_hw_state.wrpll (expected 0xb0210614, found 0x00000000)
[34021.224109] ------------[ cut here ]------------
[34021.224118] WARNING: CPU: 2 PID: 3448 at /build/linux-26_gwp/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12328 check_crtc_state+0x2c5/0x440 [i915]()
[34021.224119] pipe state doesn't match!
[34021.224119] Modules linked in: nls_iso8859_1 bnep rpcsec_gss_krb5 auth_rpcgss nfsv4 nfs lockd grace fscache uas mceusb usb_storage rc_core input_leds uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core hid_generic v4l2_common snd_usb_audio videodev usbhid snd_usbmidi_lib media pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bluetooth binfmt_misc intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel snd_hda_codec_hdmi kvm crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 snd_hda_codec_realtek lrw snd_hda_codec_generic gf128mul snd_soc_rt5640 glue_helper ablk_helper snd_soc_rl6231 cryptd snd_soc_core snd_compress ac97_bus snd_pcm_dmaengine serio_raw snd_hda_intel snd_seq_midi snd_hda_codec snd_seq_midi_event snd_hda_core snd_rawmidi snd_hwdep mei_me snd_pcm
[34021.224142] mei shpchp lpc_ich snd_seq snd_seq_device snd_timer 8250_fintek acpi_pad snd_soc_sst_acpi dw_dmac snd dw_dmac_core soundcore tpm_infineon i2c_designware_platform mac_hid i2c_designware_core spi_pxa2xx_platform 8250_dw sunrpc parport_pc ppdev lp parport autofs4 i915 i2c_algo_bit drm_kms_helper psmouse ahci r8169 drm libahci mii sdhci_acpi video sdhci i2c_hid hid
[34021.224156] CPU: 2 PID: 3448 Comm: chrome Tainted: G OE 4.2.0-19-generic #23-Ubuntu
[34021.224156] Hardware name: Gigabyte Technology Co., Ltd. H97M-D3H/H97M-D3H, BIOS F6 04/21/2015
[34021.224157] 0000000000000000 0000000032735b2e ffff8803b7f57608 ffffffff817e93f9
[34021.224159] 0000000000000000 ffff8803b7f57660 ffff8803b7f57648 ffffffff8107b3d6
[34021.224160] ffff8803b7f57688 ffff8803b7f576f0 ffff88040ca44000 0000000000000001
[34021.224161] Call Trace:
[34021.224165] [<ffffffff817e93f9>] dump_stack+0x45/0x57
[34021.224168] [<ffffffff8107b3d6>] warn_slowpath_common+0x86/0xc0
[34021.224169] [<ffffffff8107b465>] warn_slowpath_fmt+0x55/0x70
[34021.224178] [<ffffffffc01d8877>] ? intel_pipe_config_compare+0xa67/0xc60 [i915]
[34021.224186] [<ffffffffc01d8d35>] check_crtc_state+0x2c5/0x440 [i915]
[34021.224196] [<ffffffffc01ecb5d>] intel_modeset_check_state+0x21d/0x6d0 [i915]
[34021.224205] [<ffffffffc01edd17>] intel_crtc_set_config+0x4c7/0x580 [i915]
[34021.224213] [<ffffffffc00824a6>] drm_mode_set_config_internal+0x66/0x100 [drm]
[34021.224216] [<ffffffffc0150692>] restore_fbdev_mode+0xc2/0xf0 [drm_kms_helper]
[34021.224219] [<ffffffffc0152549>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x70 [drm_kms_helper]
[34021.224228] [<ffffffffc01fbe6e>] intel_fbdev_restore_mode+0x1e/0x50 [i915]
[34021.224237] [<ffffffffc022588e>] i915_driver_lastclose+0xe/0x20 [i915]
[34021.224241] [<ffffffffc007596e>] drm_lastclose+0x2e/0x140 [drm]
[34021.224245] [<ffffffffc0075d96>] drm_release+0x316/0x500 [drm]
[34021.224247] [<ffffffff811feff4>] __fput+0xe4/0x220
[34021.224248] [<ffffffff811ff17e>] ____fput+0xe/0x10
[34021.224249] [<ffffffff81098b8b>] task_work_run+0x9b/0xb0
[34021.224251] [<ffffffff8107db80>] do_exit+0x3a0/0xb10
[34021.224253] [<ffffffff8123e836>] ? fsnotify+0x316/0x4a0
[34021.224254] [<ffffffff8107e383>] do_group_exit+0x43/0xb0
[34021.224256] [<ffffffff8108a414>] get_signal+0x274/0x600
[34021.224258] [<ffffffff81014457>] do_signal+0x37/0xa40
[34021.224260] [<ffffffff811337e8>] ? seccomp_phase1+0x98/0x290
[34021.224262] [<ffffffff81210a25>] ? do_vfs_ioctl+0x295/0x480
[34021.224263] [<ffffffff81014ebb>] do_notify_resume+0x5b/0x70
[34021.224265] [<ffffffff817f03c4>] int_signal+0x12/0x17
[34021.224266] ---[ end trace 4fcb719092116d3b ]---