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[Hector-yuen <1523088@xxxxxxxxxxxxxxxxxx>]

Has been happening to me as well

i7-6560U running 3.19.0-58-generic

[ 2523.443953] ------------[ cut here ]------------
[ 2523.443993] WARNING: CPU: 2 PID: 1681 at /build/linux-lts-vivid-GISjUd/linux-lts-vivid-3.19.0/ubuntu/i915/intel_pm.c:3406 skl_update_other_pipe_wm+0x210/0x220 [i915_bpo]()
[ 2523.443995] WARN_ON(!wm_changed)
[ 2523.443996] Modules linked in: hid_generic cdc_ether usbnet r8152 mii dell_wmi sparse_keymap ctr ccm nvram msr dm_crypt arc4 snd_hda_codec_hdmi(OE) dell_led dell_laptop dcdbas x86_pkg_temp_thermal coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul snd_hda_codec_realtek(OE) snd_hda_codec_generic(OE) aesni_intel snd_hda_intel(OE) snd_hda_codec(OE) snd_hda_core(OE) snd_hwdep snd_pcm aes_x86_64 lrw gf128mul glue_helper ablk_helper snd_seq_midi cryptd iwlmvm(OE) snd_seq_midi_event mac80211(OE) snd_rawmidi dm_multipath joydev scsi_dh iwlwifi(OE) serio_raw rts_cr_host(OE) cfg80211(OE) rts_cr_core(OE) uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media hid_multitouch snd_seq snd_seq_device snd_timer snd soundcore shpchp i2c_hid acpi_pad int3403_thermal int3400_thermal acpi_thermal_rel mac_hid intel_hid(OE) i915_bpo intel_ips drm_kms_helper cmac drm i2c_algo_bit parport_pc ppdev rfcomm(OE) bnep(OE) lp parport nls_iso8859_1 btrfs xor raid6_pq dm_mirror dm_region_hash dm_log usbhid hid btusb(OE) btintel(OE) bluetooth(OE) compat(OE) psmouse ahci nvme libahci wmi video
[ 2523.444052] CPU: 2 PID: 1681 Comm: Xorg Tainted: G        W  OE  3.19.0-58-generic #64~14.04.1-Ubuntu
[ 2523.444054] Hardware name: Dell Inc. XPS 13 9350/09JHRY, BIOS 1.3.3 03/01/2016
[ 2523.444056]  0000000000000000 ffff88046af8f588 ffffffff817b6c3d ffff88046af8f5d8
[ 2523.444059]  ffffffffc0448268 ffff88046af8f5c8 ffffffff81075f3a ffff88046af8f700
[ 2523.444061]  ffff880466999000 ffff88046af8f670 ffff88046af8f724 ffff880466998000
[ 2523.444064] Call Trace:
[ 2523.444071]  [<ffffffff817b6c3d>] dump_stack+0x63/0x81
[ 2523.444076]  [<ffffffff81075f3a>] warn_slowpath_common+0x8a/0xc0
[ 2523.444078]  [<ffffffff81075fb6>] warn_slowpath_fmt+0x46/0x50
[ 2523.444097]  [<ffffffffc0387720>] skl_update_other_pipe_wm+0x210/0x220 [i915_bpo]
[ 2523.444116]  [<ffffffffc0387935>] skl_update_wm+0x205/0x850 [i915_bpo]
[ 2523.444141]  [<ffffffffc03d25de>] ? gen9_read32+0x6e/0x310 [i915_bpo]
[ 2523.444159]  [<ffffffffc0388a1e>] intel_update_watermarks+0x1e/0x30 [i915_bpo]
[ 2523.444184]  [<ffffffffc03ef560>] intel_finish_crtc_commit+0x190/0x1b0 [i915_bpo]
[ 2523.444194]  [<ffffffffc035ab59>] drm_atomic_helper_commit_planes_on_crtc+0x169/0x240 [drm_kms_helper]
[ 2523.444221]  [<ffffffffc04095e8>] intel_atomic_commit+0x68/0x100 [i915_bpo]
[ 2523.444243]  [<ffffffffc02fb247>] drm_atomic_commit+0x37/0x60 [drm]
[ 2523.444252]  [<ffffffffc03591bd>] drm_atomic_helper_update_plane+0xed/0x140 [drm_kms_helper]
[ 2523.444268]  [<ffffffffc02eacd0>] __setplane_internal+0x190/0x2c0 [drm]
[ 2523.444282]  [<ffffffffc02eaf1c>] drm_mode_cursor_universal+0x11c/0x200 [drm]
[ 2523.444286]  [<ffffffff817bc19b>] ? __ww_mutex_lock+0x1b/0x97
[ 2523.444298]  [<ffffffffc02eb07c>] drm_mode_cursor_common+0x7c/0x1b0 [drm]
[ 2523.444301]  [<ffffffff81081ac7>] ? __sigqueue_free.part.12+0x37/0x40
[ 2523.444317]  [<ffffffffc02ef351>] drm_mode_cursor_ioctl+0x41/0x50 [drm]
[ 2523.444317]  [<ffffffffc02ef351>] drm_mode_cursor_ioctl+0x41/0x50 [drm]
[ 2523.444329]  [<ffffffffc02dfaac>] drm_ioctl+0x1ec/0x660 [drm]
[ 2523.444334]  [<ffffffff812028c8>] do_vfs_ioctl+0x2f8/0x510
[ 2523.444336]  [<ffffffff81082c62>] ? __set_task_blocked+0x32/0x70
[ 2523.444340]  [<ffffffff811ef788>] ? __vfs_read+0x18/0x50
[ 2523.444343]  [<ffffffff81085736>] ? __set_current_blocked+0x36/0x90
[ 2523.444345]  [<ffffffff81202b61>] SyS_ioctl+0x81/0xa0
[ 2523.444348]  [<ffffffff810859f6>] ? SyS_rt_sigprocmask+0x86/0xb0
[ 2523.444352]  [<ffffffff817be78d>] system_call_fastpath+0x16/0x1b
[ 2523.444354] ---[ end trace 5311b4c88f205a25 ]---

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https://bugs.launchpad.net/bugs/1523088

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

Status in X.Org X server:
  Confirmed
Status in linux package in Ubuntu:
  Incomplete

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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