I believe this is the same issue with Ubuntu 16.04/Mint 18.1 on a Dell
Precision 5510 laptop.  This shows up constantly in the kernel logs
(kernel 4.4.0-51-generic)


[   15.021294] ------------[ cut here ]------------
[   15.021309] WARNING: CPU: 0 PID: 1564 at 
/build/linux-j9zxaP/linux-4.4.0/ubuntu/i915/intel_pm.c:3675 
skl_update_other_pipe_wm+0x16c/0x180 [i915_bpo]()
[   15.021310] WARN_ON(!wm_changed)
[   15.021311] Modules linked in:
[   15.021312]  ctr ccm pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) 
bbswitch(OE) vboxdrv(OE) bnep binfmt_misc nls_iso8859_1 nvidia_uvm(POE) 
i2c_designware_platform i2c_designware_core snd_hda_codec_hdmi arc4 dell_wmi 
mxm_wmi dell_led snd_hda_codec_realtek snd_hda_codec_generic dell_rbtn 
dell_laptop dcdbas dell_smm_hwmon uvcvideo videobuf2_vmalloc videobuf2_memops 
videobuf2_v4l2 nvidia_drm(POE) nvidia_modeset(POE) videobuf2_core 
hid_multitouch v4l2_common snd_hda_intel videodev btusb snd_hda_codec btrtl 
media snd_hda_core snd_hwdep nvidia(POE) snd_pcm iwlmvm snd_seq_midi 
snd_seq_midi_event snd_rawmidi mac80211 intel_rapl x86_pkg_temp_thermal 
intel_powerclamp coretemp kvm_intel kvm snd_seq iwlwifi irqbypass 
snd_seq_device snd_timer joydev input_leds serio_raw cfg80211 snd soundcore 
rtsx_pci_ms
[   15.021333]  memstick mei_me idma64 mei virt_dma intel_lpss_pci 
processor_thermal_device ie31200_edac intel_soc_dts_iosf edac_core shpchp 
hci_uart btbcm btqca btintel bluetooth int3403_thermal wmi intel_lpss_acpi 
dell_smo8800 intel_lpss int3402_thermal int340x_thermal_zone int3400_thermal 
acpi_thermal_rel intel_hid acpi_als acpi_pad sparse_keymap mac_hid kfifo_buf 
industrialio parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq drbg 
ansi_cprng algif_skcipher af_alg dm_crypt dm_mirror dm_region_hash dm_log 
hid_logitech_hidpp hid_logitech_dj usbhid rtsx_pci_sdmmc crct10dif_pclmul 
i915_bpo crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul 
glue_helper ablk_helper cryptd intel_ips i2c_algo_bit drm_kms_helper psmouse 
syscopyarea sysfillrect sysimgblt fb_sys_fops drm ahci nvme rtsx_pci
[   15.021354]  libahci i2c_hid hid pinctrl_sunrisepoint video pinctrl_intel 
fjes
[   15.021358] CPU: 0 PID: 1564 Comm: Xorg Tainted: P        W  OE   
4.4.0-51-generic #72-Ubuntu
[   15.021358] Hardware name: Dell Inc. Precision 5510/08R8KJ, BIOS 1.2.14 
08/31/2016
[   15.021359]  0000000000000286 00000000ed8db547 ffff88089351f920 
ffffffff813f5fc3
[   15.021361]  ffff88089351f968 ffffffffc03999a0 ffff88089351f958 
ffffffff810812b2
[   15.021362]  ffff88089162b000 ffff8808908fa148 ffff88089162a000 
ffff88089101a378
[   15.021363] Call Trace:
[   15.021366]  [<ffffffff813f5fc3>] dump_stack+0x63/0x90
[   15.021369]  [<ffffffff810812b2>] warn_slowpath_common+0x82/0xc0
[   15.021370]  [<ffffffff8108134c>] warn_slowpath_fmt+0x5c/0x80
[   15.021378]  [<ffffffffc02bafec>] skl_update_other_pipe_wm+0x16c/0x180 
[i915_bpo]
[   15.021386]  [<ffffffffc02bb185>] skl_update_wm+0x185/0x610 [i915_bpo]
[   15.021398]  [<ffffffffc034c3af>] ? 
intel_ddi_enable_transcoder_func+0x17f/0x260 [i915_bpo]
[   15.021406]  [<ffffffffc02bef0e>] intel_update_watermarks+0x1e/0x30 
[i915_bpo]
[   15.021418]  [<ffffffffc032e681>] haswell_crtc_enable+0x761/0x8e0 [i915_bpo]
[   15.021430]  [<ffffffffc032a586>] intel_atomic_commit+0x5d6/0x14a0 [i915_bpo]
[   15.021440]  [<ffffffffc00d3bde>] ? drm_atomic_check_only+0x18e/0x590 [drm]
[   15.021447]  [<ffffffffc00d4017>] drm_atomic_commit+0x37/0x60 [drm]
[   15.021452]  [<ffffffffc016fdb6>] drm_atomic_helper_set_config+0x76/0xb0 
[drm_kms_helper]
[   15.021458]  [<ffffffffc00c2e42>] drm_mode_set_config_internal+0x62/0x100 
[drm]
[   15.021465]  [<ffffffffc00c749c>] drm_mode_setcrtc+0x3cc/0x4f0 [drm]
[   15.021470]  [<ffffffffc00b8752>] drm_ioctl+0x152/0x540 [drm]
[   15.021476]  [<ffffffffc00c70d0>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
[   15.021478]  [<ffffffff8122166f>] do_vfs_ioctl+0x29f/0x490
[   15.021480]  [<ffffffff8108e521>] ? __set_task_blocked+0x41/0xa0
[   15.021481]  [<ffffffff81090eb6>] ? __set_current_blocked+0x36/0x60
[   15.021482]  [<ffffffff812218d9>] SyS_ioctl+0x79/0x90
[   15.021483]  [<ffffffff81091154>] ? SyS_rt_sigprocmask+0x74/0xc0
[   15.021485]  [<ffffffff81836032>] entry_SYSCALL_64_fastpath+0x16/0x71
[   15.021486] ---[ end trace f3f8c1347bdf40a5 ]---

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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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