Got the hangup again, this time while using 3.19-rc5

Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346217] ------------[ cut here ]------------
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346262] WARNING: CPU: 0 PID: 1822 at /home/apw/COD/linux/drivers/gpu/drm/i915/intel_display.c:3624 intel
_crtc_wait_for_pending_flips+0x1ee/0x200 [i915]()
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346265] Removing stuck page flip
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346267] Modules linked in: vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) nls_iso8859_1 nls_utf8 
btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c msr uas usb_storage xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masque
rade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp iptable_filter
 ip_tables x_tables bridge stp llc pci_stub ctr ccm asix usbnet mii arc4 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videod
ev hid_logitech_hidpp media joydev hid_multitouch hid_rmi btusb dell_wmi sparse_keymap intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coret
emp kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_soc_rt5640 snd_soc_rl6231 dell_laptop snd_soc_core snd_hda_codec_hdmi dcdbas s
nd_hda_codec_realtek snd_compress snd_hda_codec_generic iwlmvm snd_pcm_dmaengine mac80211 snd_hda_intel aesni_intel snd_hda_controller snd_seq_midi sn
d_seq_midi_event aes_x86_64 lrw gf128mul glue_helper ablk_helper iwlwifi cryptd snd_rawmidi snd_hda_codec cfg80211 serio_raw snd_hwdep snd_pcm mei_me 
lpc_ich shpchp mei snd_seq snd_seq_device snd_timer dw_dmac i2c_hid dw_dmac_core snd soundcore snd_soc_sst_acpi 8250_dw i2c_designware_platform i2c_de
signware_core spi_pxa2xx_platform rfcomm intel_smartconnect bnep mac_hid bluetooth parport_pc ppdev binfmt_misc i8k lp parport hid_generic hid_logitec
h_dj usbhid hid i915 psmouse i2c_algo_bit drm_kms_helper ahci libahci drm wmi sdhci_acpi video sdhci [last unloaded: vboxdrv]
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346422] CPU: 0 PID: 1822 Comm: Xorg Tainted: G        W  OE  3.19.0-031900rc5-generic #201501180935
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346426] Hardware name: Dell Inc. XPS13 9333/0D13CR, BIOS A04 03/19/2014
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346428]  0000000000000e28 ffff8800bd3a3af8 ffffffff817c5098 0000000000000007
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346434]  ffff8800bd3a3b48 ffff8800bd3a3b38 ffffffff81076dd7 0000000000000286
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346440]  ffff8800bc3131a8 ffff880211f59000 ffff8802123f84c8 ffff8800bc313000
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346446] Call Trace:
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346453]  [<ffffffff817c5098>] dump_stack+0x45/0x57
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346461]  [<ffffffff81076dd7>] warn_slowpath_common+0x97/0xe0
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346469]  [<ffffffff81076ed6>] warn_slowpath_fmt+0x46/0x50
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346481]  [<ffffffff810b7ff7>] ? finish_wait+0x67/0x80
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346527]  [<ffffffffc03d852e>] intel_crtc_wait_for_pending_flips+0x1ee/0x200 [i915]
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346533]  [<ffffffff810b7ec0>] ? prepare_to_wait_event+0x100/0x100
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346577]  [<ffffffffc03d9d63>] intel_crtc_disable_planes+0x33/0x140 [i915]
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346619]  [<ffffffffc03da395>] haswell_crtc_disable+0x45/0x2b0 [i915]
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346626]  [<ffffffff817cfd08>] ? __ww_mutex_lock+0x28/0xad
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346667]  [<ffffffffc03daf57>] intel_crtc_control+0x57/0x130 [i915]
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346708]  [<ffffffffc03db091>] intel_crtc_update_dpms+0x61/0x70 [i915]
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346752]  [<ffffffffc03de7c1>] intel_connector_dpms+0x61/0x70 [i915]
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346788]  [<ffffffffc02bed14>] drm_mode_connector_set_obj_prop+0xa4/0xb0 [drm]
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346826]  [<ffffffffc02c5f74>] drm_mode_obj_set_property_ioctl+0x134/0x1d0 [drm]
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346861]  [<ffffffffc02c6040>] drm_mode_connector_property_set_ioctl+0x30/0x40 [drm]
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346888]  [<ffffffffc02b5e76>] drm_ioctl+0x2e6/0x590 [drm]
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346926]  [<ffffffffc02c6010>] ? drm_mode_obj_set_property_ioctl+0x1d0/0x1d0 [drm]
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346933]  [<ffffffff8126cabb>] ? kernfs_fop_write+0xbb/0x190
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346940]  [<ffffffff81234624>] ? fsnotify+0x204/0x260
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346948]  [<ffffffff81209075>] do_vfs_ioctl+0x75/0x320
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346953]  [<ffffffff811f6bd6>] ? vfs_write+0x196/0x1f0
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346961]  [<ffffffff812133e5>] ? __fget_light+0x25/0x70
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346968]  [<ffffffff812093b1>] SyS_ioctl+0x91/0xb0
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346975]  [<ffffffff8120b4cb>] ? SyS_poll+0x6b/0x100
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346983]  [<ffffffff817d23ad>] system_call_fastpath+0x16/0x1b
Feb  4 10:43:39 jkekkonen-XPS kernel: [225278.346987] ---[ end trace d44d9c3787705a30 ]---