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[Alvin <info@xxxxxxxx>]

Tested with 4.3.0-994-generic_4.3.0-994.201510062200

New warning during installation:
W: Possible missing firmware /lib/firmware/i915/skl_guc_ver4.bin for module i915

The original error remains:
[drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in dpll_hw_state.wrpll

A new warning appears in the log:

Oct 07 09:31:25 pc-alvin kernel: ------------[ cut here ]------------
Oct 07 09:31:25 pc-alvin kernel: WARNING: CPU: 0 PID: 238 at /home/kernel/COD/linux/drivers/gpu/drm/i915/i915_gem_context.c:141 i915_gem_context_free+0x1df/0x1f0 [i915]()
Oct 07 09:31:25 pc-alvin kernel: WARN_ON_ONCE(!ppgtt)
Oct 07 09:31:25 pc-alvin kernel: Modules linked in:
Oct 07 09:31:25 pc-alvin kernel:  bnep nls_iso8859_1 xfs libcrc32c intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_
Oct 07 09:31:25 pc-alvin kernel:  iptable_filter ip_tables parport_pc x_tables ppdev lp parport autofs4 drbg ansi_cprng algif_skcipher af_alg hid_generic hid_cherry usbhid hid dm_crypt uas usb_stor
Oct 07 09:31:25 pc-alvin kernel: CPU: 0 PID: 238 Comm: plymouthd Tainted: G        W       4.3.0-994-generic #201510062200
Oct 07 09:31:25 pc-alvin kernel: Hardware name: FUJITSU D3222-B1/D3222-B1, BIOS V4.6.5.4 R1.37.0 for D3222-B1x 08/06/2015
Oct 07 09:31:25 pc-alvin kernel:  ffffffffc02bf560 ffff880405fd3c38 ffffffff813a637d ffff880405fd3c80
Oct 07 09:31:25 pc-alvin kernel:  ffff880405fd3c70 ffffffff8107a586 0000000000000000 0000000000000000
Oct 07 09:31:25 pc-alvin kernel:  ffff880405cbc200 0000000000000000 ffff880405fd3d30 ffff880405fd3cd0
Oct 07 09:31:25 pc-alvin kernel: Call Trace:
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffff813a637d>] dump_stack+0x44/0x57
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffff8107a586>] warn_slowpath_common+0x86/0xc0
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffff8107a60c>] warn_slowpath_fmt+0x4c/0x50
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffffc02125df>] i915_gem_context_free+0x1df/0x1f0 [i915]
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffffc021260a>] context_idr_cleanup+0x1a/0x20 [i915]
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffff813a6b4b>] idr_for_each+0x9b/0xe0
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffffc02125f0>] ? i915_gem_context_free+0x1f0/0x1f0 [i915]
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffffc02135e3>] i915_gem_context_close+0x23/0x30 [i915]
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffffc02a1e5b>] i915_driver_preclose+0x2b/0x50 [i915]
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffffc0032b75>] drm_release+0xa5/0x500 [drm]
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffff811f38d4>] __fput+0xe4/0x210
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffff811f3a3e>] ____fput+0xe/0x10
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffff81096997>] task_work_run+0x77/0x90
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffff8107cf9d>] do_exit+0x2bd/0xaf0
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffff81065977>] ? __do_page_fault+0x1b7/0x430
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffff8107d84f>] do_group_exit+0x3f/0xa0
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffff8107d8c4>] SyS_exit_group+0x14/0x20
Oct 07 09:31:25 pc-alvin kernel:  [<ffffffff817b3c76>] entry_SYSCALL_64_fastpath+0x16/0x75
Oct 07 09:31:25 pc-alvin kernel: ---[ end trace 31fbc57b8abb5f10 ]---

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https://bugs.launchpad.net/bugs/1501765

Title:
  [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in
  dpll_hw_state.wrpll (expected 0xb012040f, found 0x00000000)

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  No actual trouble, (except having to restart plasmashell manually
  after each login, but that might not be related). Logs are full of
  warnings:

  Oct 01 14:52:39 pc-alvin kernel: [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in dpll_hw_state.wrpll (expected 0xb012040f, found 0x00000000)
  Oct 01 14:52:39 pc-alvin kernel: ------------[ cut here ]------------
  Oct 01 14:52:39 pc-alvin kernel: WARNING: CPU: 3 PID: 1033 at /build/linux-X28llO/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]()
  Oct 01 14:52:39 pc-alvin kernel: pipe state doesn't match!
  Oct 01 14:52:39 pc-alvin kernel: Modules linked in: rfcomm bnep nls_iso8859_1 xfs libcrc32c intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm snd_hda_codec_hdmi snd_h
  Oct 01 14:52:39 pc-alvin kernel:  nf_conntrack_ftp nf_conntrack iptable_filter parport_pc ip_tables ppdev x_tables lp parport autofs4 drbg ansi_cprng algif_skcipher af_alg uas usb_storage hid_gener
  Oct 01 14:52:39 pc-alvin kernel: CPU: 3 PID: 1033 Comm: Xorg Tainted: G        W       4.2.0-12-generic #14-Ubuntu
  Oct 01 14:52:39 pc-alvin kernel: Hardware name: FUJITSU D3222-B1/D3222-B1, BIOS V4.6.5.4 R1.37.0 for D3222-B1x 08/06/2015
  Oct 01 14:52:39 pc-alvin kernel:  ffffffffc027eab0 ffff8804087737e8 ffffffff817b0cd5 0000000000000000
  Oct 01 14:52:39 pc-alvin kernel:  ffff880408773838 ffff880408773828 ffffffff81076536 ffff880408773858
  Oct 01 14:52:39 pc-alvin kernel:  ffff8804087738c0 ffff88040ba1e800 0000000000000001 ffff88040ba1eb50
  Oct 01 14:52:39 pc-alvin kernel: Call Trace:
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffff817b0cd5>] dump_stack+0x45/0x57
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffff81076536>] warn_slowpath_common+0x86/0xc0
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffff810765b6>] warn_slowpath_fmt+0x46/0x50
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffffc0211407>] ? intel_pipe_config_compare+0xa67/0xc60 [i915]
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffffc02118c5>] check_crtc_state+0x2c5/0x440 [i915]
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffffc02253de>] intel_modeset_check_state+0x20e/0x6b0 [i915]
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffffc0226587>] intel_crtc_set_config+0x4c7/0x580 [i915]
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffffc0039915>] ? drm_mode_create+0x25/0x60 [drm]
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffffc0033036>] drm_mode_set_config_internal+0x66/0x100 [drm]
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffffc00375f8>] drm_mode_setcrtc+0x3a8/0x4c0 [drm]
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffffc0028365>] drm_ioctl+0x125/0x610 [drm]
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffffc0037250>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffff81200075>] do_vfs_ioctl+0x285/0x470
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffff8108190f>] ? recalc_sigpending+0x1f/0x60
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffff810828b2>] ? __set_task_blocked+0x32/0x70
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffff812002d9>] SyS_ioctl+0x79/0x90
  Oct 01 14:52:39 pc-alvin kernel:  [<ffffffff817b7572>] entry_SYSCALL_64_fastpath+0x16/0x75
  Oct 01 14:52:39 pc-alvin kernel: ---[ end trace 9b3399ab2e633e05 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-12-generic 4.2.0-12.14
  ProcVersionSignature: Ubuntu 4.2.0-12.14-generic 4.2.1
  Uname: Linux 4.2.0-12-generic x86_64
  ApportVersion: 2.19-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  alvin      1495 F.... pulseaudio
   /dev/snd/controlC1:  alvin      1495 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Thu Oct  1 15:28:34 2015
  HibernationDevice: RESUME=UUID=d6485f6e-2acf-4d0e-b368-65c0bb79b539
  InstallationDate: Installed on 2015-10-01 (0 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150924)
  IwConfig:
   enp0s25   no wireless extensions.
   
   lo        no wireless extensions.
  MachineType: FUJITSU D3222-B1
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-12-generic.efi.signed root=/dev/mapper/kubuntu-root ro noprompt quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-12-generic N/A
   linux-backports-modules-4.2.0-12-generic  N/A
   linux-firmware                            1.148
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  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: 08/06/2015
  dmi.bios.vendor: FUJITSU // American Megatrends Inc.
  dmi.bios.version: V4.6.5.4 R1.37.0 for D3222-B1x
  dmi.board.name: D3222-B1
  dmi.board.vendor: FUJITSU
  dmi.board.version: S26361-D3222-B1
  dmi.chassis.type: 6
  dmi.chassis.vendor: FUJITSU
  dmi.modalias: dmi:bvnFUJITSU//AmericanMegatrendsInc.:bvrV4.6.5.4R1.37.0forD3222-B1x:bd08/06/2015:svnFUJITSU:pnD3222-B1:pvr:rvnFUJITSU:rnD3222-B1:rvrS26361-D3222-B1:cvnFUJITSU:ct6:cvr:
  dmi.product.name: D3222-B1
  dmi.sys.vendor: FUJITSU

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