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[dan <d.dan@xxxxxxx>]

Also with kernel 4.3 the problem persists.

------------[ cut here ]------------
[Sam Dez  5 23:23:25 2015] WARNING: CPU: 2 PID: 880 at /home/kernel/COD/linux/drivers/gpu/drm/i915/intel_pm.c:3668 skl_update_other_pipe_wm+0x1de/0x1f0 [i915]()
[Sam Dez  5 23:23:25 2015] WARN_ON(!wm_changed)
[Sam Dez  5 23:23:25 2015] Modules linked in:
[Sam Dez  5 23:23:25 2015]  drbg ansi_cprng ctr ccm rfcomm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc hid_multitouch ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) bnep arc4 rtsx_usb_ms memstick uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev joydev media btusb btrtl btbcm btintel bluetooth i2c_designware_platform i2c_designware_core acer_wmi sparse_keymap snd_hda_codec_hdmi ath10k_pci ath10k_core snd_hda_codec_realtek ath snd_hda_codec_generic mac80211 intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp snd_hda_intel
[Sam Dez  5 23:23:25 2015]  snd_hda_codec coretemp snd_hda_core cfg80211 crct10dif_pclmul snd_hwdep crc32_pclmul snd_pcm aesni_intel aes_x86_64 snd_seq_midi lrw snd_seq_midi_event gf128mul glue_helper snd_rawmidi ablk_helper cryptd snd_seq snd_seq_device snd_timer input_leds serio_raw idma64 snd virt_dma soundcore mei_me mei shpchp intel_lpss_pci dell_smo8800 intel_lpss_acpi intel_lpss mac_hid tpm_crb acpi_pad kvm_intel kvm parport_pc ppdev lp parport autofs4 hid_generic rtsx_usb_sdmmc rtsx_usb hid_logitech_hidpp hid_logitech_dj usbhid nouveau i915 mxm_wmi ttm i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops r8169 ahci mii drm libahci i2c_hid hid wmi pinctrl_sunrisepoint video pinctrl_intel fjes
[Sam Dez  5 23:23:25 2015] CPU: 2 PID: 880 Comm: Xorg Tainted: G        W  OE   4.3.0-040300-generic #201511020949
[Sam Dez  5 23:23:25 2015] Hardware name: Acer Aspire V5-591G/Usopp_SLS, BIOS V1.03 10/23/2015
[Sam Dez  5 23:23:25 2015]  ffffffffc026e570 ffff880276227670 ffffffff813a4c94 ffff8802762276b8
[Sam Dez  5 23:23:25 2015]  ffff8802762276a8 ffffffff81078052 ffff8802762277f4 ffff880274339000
[Sam Dez  5 23:23:25 2015]  ffff88027433a000 0000000000000000 ffff880276227740 ffff880276227708
[Sam Dez  5 23:23:25 2015] Call Trace:
[Sam Dez  5 23:23:25 2015]  [<ffffffff813a4c94>] dump_stack+0x44/0x60
[Sam Dez  5 23:23:25 2015]  [<ffffffff81078052>] warn_slowpath_common+0x82/0xc0
[Sam Dez  5 23:23:25 2015]  [<ffffffff810780dc>] warn_slowpath_fmt+0x4c/0x50
[Sam Dez  5 23:23:25 2015]  [<ffffffffc01b57ce>] skl_update_other_pipe_wm+0x1de/0x1f0 [i915]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc01b599b>] skl_update_wm+0x1bb/0x740 [i915]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc01f8b27>] ? gen9_read32+0xf7/0x2d0 [i915]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc01ab28c>] ? i915_get_vblank_timestamp+0x5c/0x90 [i915]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc01ba03e>] intel_update_watermarks+0x1e/0x30 [i915]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc0215c70>] intel_atomic_commit+0x3d0/0x640 [i915]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc00a5482>] ? drm_atomic_get_crtc_state+0x32/0xd0 [drm]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc00a6407>] drm_atomic_commit+0x37/0x60 [drm]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc011d72f>] drm_atomic_helper_disable_plane+0xef/0x130 [drm_kms_helper]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc009611a>] __setplane_internal+0x23a/0x2f0 [drm]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc00962eb>] drm_mode_cursor_universal+0x11b/0x1f0 [drm]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc0096441>] drm_mode_cursor_common+0x81/0x180 [drm]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc009a241>] drm_mode_cursor_ioctl+0x41/0x50 [drm]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc008b408>] drm_ioctl+0x138/0x500 [drm]
[Sam Dez  5 23:23:25 2015]  [<ffffffffc009a200>] ? drm_mode_setcrtc+0x4c0/0x4c0 [drm]
[Sam Dez  5 23:23:25 2015]  [<ffffffff812077c5>] ? dput+0xb5/0x220
[Sam Dez  5 23:23:25 2015]  [<ffffffff811f0ea8>] ? __vfs_read+0x28/0xe0
[Sam Dez  5 23:23:25 2015]  [<ffffffff81204205>] do_vfs_ioctl+0x285/0x470
[Sam Dez  5 23:23:25 2015]  [<ffffffff81084912>] ? __set_task_blocked+0x32/0x70
[Sam Dez  5 23:23:25 2015]  [<ffffffff81204469>] SyS_ioctl+0x79/0x90
[Sam Dez  5 23:23:25 2015]  [<ffffffff817b3036>] entry_SYSCALL_64_fastpath+0x16/0x75
[Sam Dez  5 23:23:25 2015] ---[ end trace a62f2571d02f797e ]---

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Packages, which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1523088

Title:
  WARN_ON(!wm_changed) warning and stacktrace in kernel log

Status in xorg-server package in Ubuntu:
  New

Bug description:
  I always get an warning and stacktrace (and it seems to hang a little
  bit). This occurs after reboot as well as when I move with the cursor
  between my hdmi monitor and my laptop. (This only occurs when HDMI is
  connected)

  Default Kubuntu install version 15.10 with kernel 4.2.0-19-generic
  Processor: i5 6300hq
  Graphics: gtx950m

  WARNING: CPU: 1 PID: 827 at /build/linux-26_gwp/linux-4.2.0/drivers/gpu/drm/i915/intel_pm.c:3404 skl_update_other_pipe_wm+0x1de/0x1f0 [i915]()
  [Sam Dez  5 12:34:46 2015] WARN_ON(!wm_changed)
  [Sam Dez  5 12:34:46 2015] Modules linked in:
  [Sam Dez  5 12:34:46 2015]  nls_iso8859_1 pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) drbg ansi_cprng ctr ccm rfcomm bnep arc4 rtsx_usb_ms memstick i2c_designware_platform i2c_designware_core acer_wmi sparse_keymap snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core intel_rapl snd_hwdep iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul snd_seq_device glue_helper snd_timer ablk_helper cryptd ath10k_pci ath10k_core snd ath mac80211 serio_raw soundcore idma64 virt_dma cfg80211 joydev input_leds uvcvideo mei_me videobuf2_vmalloc videobuf2_memops mei videobuf2_core v4l2_common intel_lpss_pci videodev media
  [Sam Dez  5 12:34:46 2015]  btusb btrtl btbcm btintel bluetooth shpchp dell_smo8800 intel_lpss_acpi intel_lpss tpm_crb acpi_pad mac_hid parport_pc ppdev lp parport autofs4 hid_generic hid_logitech_hidpp hid_logitech_dj usbhid rtsx_usb_sdmmc rtsx_usb uas usb_storage nouveau i915 mxm_wmi ttm i2c_algo_bit drm_kms_helper r8169 mii drm ahci libahci i2c_hid hid wmi pinctrl_sunrisepoint video pinctrl_intel
  [Sam Dez  5 12:34:46 2015] CPU: 1 PID: 827 Comm: Xorg Tainted: G        W  OE   4.2.0-19-generic #23-Ubuntu
  [Sam Dez  5 12:34:46 2015] Hardware name: Acer Aspire V5-591G/Usopp_SLS, BIOS V1.03 10/23/2015
  [Sam Dez  5 12:34:46 2015]  0000000000000000 00000000a287b8f0 ffff880071b03518 ffffffff817e93f9
  [Sam Dez  5 12:34:46 2015]  0000000000000000 ffff880071b03570 ffff880071b03558 ffffffff8107b3d6
  [Sam Dez  5 12:34:46 2015]  ffff880071b03620 ffff880071b036c4 ffff880279bf2000 ffff880279bf7000
  [Sam Dez  5 12:34:46 2015] Call Trace:
  [Sam Dez  5 12:34:46 2015]  [<ffffffff817e93f9>] dump_stack+0x45/0x57
  [Sam Dez  5 12:34:46 2015]  [<ffffffff8107b3d6>] warn_slowpath_common+0x86/0xc0
  [Sam Dez  5 12:34:46 2015]  [<ffffffff8107b465>] warn_slowpath_fmt+0x55/0x70
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc017eb9e>] skl_update_other_pipe_wm+0x1de/0x1f0 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc017ed6b>] skl_update_wm+0x1bb/0x740 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc01ca837>] ? gen9_read32+0xf7/0x2d0 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc01b32a2>] ? i915_get_vblank_timestamp+0x62/0xa0 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc01824be>] intel_update_watermarks+0x1e/0x30 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc01e5ad9>] intel_finish_crtc_commit+0x169/0x190 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc00f3793>] drm_atomic_helper_commit_planes_on_crtc+0x143/0x260 [drm_kms_helper]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc01fee3b>] intel_atomic_commit+0x6b/0x100 [i915]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc0094d47>] drm_atomic_commit+0x37/0x60 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc00f20cf>] drm_atomic_helper_disable_plane+0xef/0x130 [drm_kms_helper]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc008493a>] __setplane_internal+0x23a/0x2f0 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc0084b1b>] drm_mode_cursor_universal+0x12b/0x210 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffff817edf2f>] ? __ww_mutex_lock+0x5f/0xa0
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc0084c81>] drm_mode_cursor_common+0x81/0x180 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc0088ca0>] drm_mode_cursor_ioctl+0x50/0x70 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc0079495>] drm_ioctl+0x125/0x610 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffffc0088c50>] ? drm_mode_setcrtc+0x500/0x500 [drm]
  [Sam Dez  5 12:34:46 2015]  [<ffffffff81210a25>] do_vfs_ioctl+0x295/0x480
  [Sam Dez  5 12:34:46 2015]  [<ffffffff81087f71>] ? __set_task_blocked+0x41/0xa0
  [Sam Dez  5 12:34:46 2015]  [<ffffffff81210c89>] SyS_ioctl+0x79/0x90
  [Sam Dez  5 12:34:46 2015]  [<ffffffff817f01f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [Sam Dez  5 12:34:46 2015] ---[ end trace c72c2dc92b88cd01 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: xserver-xorg-core 2:1.17.2-1ubuntu9.1
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Uname: Linux 4.2.0-19-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  Date: Sat Dec  5 12:35:24 2015
  ExecutablePath: /usr/bin/Xorg
  InstallationDate: Installed on 2015-12-04 (0 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
  SourcePackage: xorg-server
  UpgradeStatus: No upgrade log present (probably fresh install)

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