Also crashing here.. this just started... two kernels ago it was
working.

[    9.191708] ------------[ cut here ]------------
[    9.191726] WARNING: CPU: 3 PID: 1380 at 
/build/linux-CcaKcB/linux-4.4.0/ubuntu/i915/intel_pm.c:3675 
skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]()
[    9.191727] WARN_ON(!wm_changed)
[    9.191728] Modules linked in:
[    9.191729]  rtsx_usb_ms memstick bnep bbswitch(OE) binfmt_misc 
nls_iso8859_1 msi_wmi mxm_wmi sparse_keymap arc4 snd_hda_codec_hdmi 
snd_hda_codec_realtek snd_hda_codec_generic intel_rapl x86_pkg_temp_thermal 
intel_powerclamp coretemp kvm_intel kvm snd_hda_intel irqbypass snd_hda_codec 
crct10dif_pclmul snd_hda_core snd_hwdep crc32_pclmul ghash_clmulni_intel 
snd_pcm aesni_intel iwlmvm snd_seq_midi aes_x86_64 snd_seq_midi_event lrw 
gf128mul snd_rawmidi glue_helper ablk_helper cryptd mac80211 snd_seq 
snd_seq_device snd_timer snd serio_raw soundcore input_leds joydev iwlwifi 
cfg80211 btusb btrtl mei_me mei shpchp hci_uart btbcm btqca btintel bluetooth 
wmi intel_lpss_acpi intel_lpss mac_hid acpi_als kfifo_buf acpi_pad industrialio 
nvidia_uvm(POE) parport_pc ppdev lp parport autofs4 hid_generic rtsx_usb_sdmmc
[    9.191754]  rtsx_usb usbhid i915_bpo nvidia_drm(POE) nvidia_modeset(POE) 
intel_ips i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt psmouse 
fb_sys_fops nvidia(POE) drm ahci alx mdio libahci pinctrl_sunrisepoint video 
i2c_hid pinctrl_intel hid fjes
[    9.191764] CPU: 3 PID: 1380 Comm: Xorg Tainted: P        W  OE   
4.4.0-52-generic #73-Ubuntu
[    9.191765] Hardware name: Micro-Star International Co., Ltd. GP72 
6QF/MS-1795, BIOS E1795IMS.114 04/29/2016
[    9.191766]  0000000000000286 00000000ecd170e0 ffff8800758c7998 
ffffffff813f63a3
[    9.191767]  ffff8800758c79e0 ffffffffc0e719a0 ffff8800758c79d0 
ffffffff810812f2
[    9.191768]  ffff88047faf6000 ffff88047d6fa148 ffff88047faf7000 
ffff88046acab378
[    9.191770] Call Trace:
[    9.191773]  [<ffffffff813f63a3>] dump_stack+0x63/0x90
[    9.191775]  [<ffffffff810812f2>] warn_slowpath_common+0x82/0xc0
[    9.191777]  [<ffffffff8108138c>] warn_slowpath_fmt+0x5c/0x80
[    9.191786]  [<ffffffffc0d92fec>] skl_update_other_pipe_wm+0x16c/0x180 
[i915_bpo]
[    9.191795]  [<ffffffffc0d93185>] skl_update_wm+0x185/0x610 [i915_bpo]
[    9.191804]  [<ffffffffc0d96f0e>] intel_update_watermarks+0x1e/0x30 
[i915_bpo]
[    9.191817]  [<ffffffffc0e023f8>] intel_atomic_commit+0x448/0x14a0 [i915_bpo]
[    9.191829]  [<ffffffffc0c77bde>] ? drm_atomic_check_only+0x18e/0x590 [drm]
[    9.191837]  [<ffffffffc0c78017>] drm_atomic_commit+0x37/0x60 [drm]
[    9.191842]  [<ffffffffc0d22dc6>] drm_atomic_helper_set_config+0x76/0xb0 
[drm_kms_helper]
[    9.191850]  [<ffffffffc0c7679a>] ? drm_modeset_lock_all_ctx+0x9a/0xb0 [drm]
[    9.191857]  [<ffffffffc0c66e42>] drm_mode_set_config_internal+0x62/0x100 
[drm]
[    9.191865]  [<ffffffffc0c6b49c>] drm_mode_setcrtc+0x3cc/0x4f0 [drm]
[    9.191870]  [<ffffffffc0c5c752>] drm_ioctl+0x152/0x540 [drm]
[    9.191877]  [<ffffffffc0c6b0d0>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
[    9.191879]  [<ffffffff8122175f>] do_vfs_ioctl+0x29f/0x490
[    9.191881]  [<ffffffff81210301>] ? __sb_end_write+0x21/0x30
[    9.191882]  [<ffffffff8120df0d>] ? vfs_write+0x15d/0x1a0
[    9.191884]  [<ffffffff812219c9>] SyS_ioctl+0x79/0x90
[    9.191886]  [<ffffffff818364b2>] entry_SYSCALL_64_fastpath+0x16/0x71
[    9.191887] ---[ end trace 3bb4116bedeb08fa ]---

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https://bugs.launchpad.net/bugs/1567417

Title:
  WARN_ON(!wm_changed) skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]

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