Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.443953] ------------[ cut here ]------------
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 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]()
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.443995] WARN_ON(!wm_changed)
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 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
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444052] CPU: 2 PID: 1681 Comm: Xorg Tainted: G        W  OE  3.19.0-58-generic #64~14.04.1-Ubuntu
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444054] Hardware name: Dell Inc. XPS 13 9350/09JHRY, BIOS 1.3.3 03/01/2016
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444056]  0000000000000000 ffff88046af8f588 ffffffff817b6c3d ffff88046af8f5d8
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444059]  ffffffffc0448268 ffff88046af8f5c8 ffffffff81075f3a ffff88046af8f700
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444061]  ffff880466999000 ffff88046af8f670 ffff88046af8f724 ffff880466998000
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444064] Call Trace:
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444071]  [<ffffffff817b6c3d>] dump_stack+0x63/0x81
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444076]  [<ffffffff81075f3a>] warn_slowpath_common+0x8a/0xc0
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444078]  [<ffffffff81075fb6>] warn_slowpath_fmt+0x46/0x50
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444097]  [<ffffffffc0387720>] skl_update_other_pipe_wm+0x210/0x220 [i915_bpo]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444116]  [<ffffffffc0387935>] skl_update_wm+0x205/0x850 [i915_bpo]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444141]  [<ffffffffc03d25de>] ? gen9_read32+0x6e/0x310 [i915_bpo]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444159]  [<ffffffffc0388a1e>] intel_update_watermarks+0x1e/0x30 [i915_bpo]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444184]  [<ffffffffc03ef560>] intel_finish_crtc_commit+0x190/0x1b0 [i915_bpo]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444194]  [<ffffffffc035ab59>] drm_atomic_helper_commit_planes_on_crtc+0x169/0x240 [drm_kms_helper]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444221]  [<ffffffffc04095e8>] intel_atomic_commit+0x68/0x100 [i915_bpo]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444243]  [<ffffffffc02fb247>] drm_atomic_commit+0x37/0x60 [drm]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444252]  [<ffffffffc03591bd>] drm_atomic_helper_update_plane+0xed/0x140 [drm_kms_helper]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444268]  [<ffffffffc02eacd0>] __setplane_internal+0x190/0x2c0 [drm]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444282]  [<ffffffffc02eaf1c>] drm_mode_cursor_universal+0x11c/0x200 [drm]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444286]  [<ffffffff817bc19b>] ? __ww_mutex_lock+0x1b/0x97
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444298]  [<ffffffffc02eb07c>] drm_mode_cursor_common+0x7c/0x1b0 [drm]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444301]  [<ffffffff81081ac7>] ? __sigqueue_free.part.12+0x37/0x40
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444317]  [<ffffffffc02ef351>] drm_mode_cursor_ioctl+0x41/0x50 [drm]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444329]  [<ffffffffc02dfaac>] drm_ioctl+0x1ec/0x660 [drm]
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444334]  [<ffffffff812028c8>] do_vfs_ioctl+0x2f8/0x510
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444336]  [<ffffffff81082c62>] ? __set_task_blocked+0x32/0x70
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444340]  [<ffffffff811ef788>] ? __vfs_read+0x18/0x50
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444343]  [<ffffffff81085736>] ? __set_current_blocked+0x36/0x90
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444345]  [<ffffffff81202b61>] SyS_ioctl+0x81/0xa0
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444348]  [<ffffffff810859f6>] ? SyS_rt_sigprocmask+0x86/0xb0
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444352]  [<ffffffff817be78d>] system_call_fastpath+0x16/0x1b
Apr 22 10:54:43 hector-XPS-13-9350 kernel: [ 2523.444354] ---[ end trace 5311b4c88f205a25 ]---


This is on a Dell XPS 13 9350

lspci:
00:00.0 Host bridge: Intel Corporation Sky Lake Host Bridge/DRAM Registers (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Sky Lake Integrated Graphics (rev 0a)
00:04.0 Signal processing controller: Intel Corporation Device 1903 (rev 09)
00:14.0 USB controller: Intel Corporation Device 9d2f (rev 21)
00:14.2 Signal processing controller: Intel Corporation Device 9d31 (rev 21)
00:15.0 Signal processing controller: Intel Corporation Device 9d60 (rev 21)
00:15.1 Signal processing controller: Intel Corporation Device 9d61 (rev 21)
00:16.0 Communication controller: Intel Corporation Device 9d3a (rev 21)
00:17.0 SATA controller: Intel Corporation Device 9d03 (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Device 9d14 (rev f1)
00:1c.5 PCI bridge: Intel Corporation Device 9d15 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Device 9d18 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Device 9d48 (rev 21)
00:1f.2 Memory controller: Intel Corporation Device 9d21 (rev 21)
00:1f.3 Audio device: Intel Corporation Device 9d70 (rev 21)
00:1f.4 SMBus: Intel Corporation Device 9d23 (rev 21)
3a:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
3b:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. Device 525a (rev 01)
3c:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd Device a802 (rev 01)