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            <b><a class="bz_bug_link 
          bz_status_REOPENED "
   title="REOPENED - [SKL APL] WARN_ON(!wm_changed) hit in the WM code with multiple pipes enabled"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=89055#c45">Comment # 45</a>
              on <a class="bz_bug_link 
          bz_status_REOPENED "
   title="REOPENED - [SKL APL] WARN_ON(!wm_changed) hit in the WM code with multiple pipes enabled"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=89055">bug 89055</a>
              from <span class="vcard"><a class="email" href="mailto:hector.yuen@gmail.com" title="Hector Yuen <hector.yuen@gmail.com>"> <span class="fn">Hector Yuen</span></a>
</span></b>
        <pre>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 ]---</pre>
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