[39724.821437] ------------[ cut here ]------------
[39724.821509] WARNING: CPU: 1 PID: 1531 at /build/buildd/linux-3.16.0/drivers/gpu/drm/i915/intel_display.c:3324 intel_crtc_wait_for_pending_flips+0x16c/0x180 [i915]()
[39724.821513] Modules linked in: ctr ccm xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT xt_tcpudp iptable_filter ip_tables x_tables bridge stp llc pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) nvram msr snd_hrtimer snd_hda_codec_hdmi snd_hda_codec_idt snd_hda_codec_generic uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev snd_hda_intel snd_hda_controller media snd_hda_codec dell_wmi snd_hwdep sparse_keymap snd_pcm intel_rapl snd_seq_midi x86_pkg_temp_thermal snd_seq_midi_event intel_powerclamp snd_rawmidi dell_laptop coretemp dcdbas kvm_intel kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel snd_seq dm_multipath scsi_dh aesni_intel arc4 aes_x86_64 i915 lrw
[39724.821590]  iwldvm mac80211 gf128mul glue_helper ablk_helper drm_kms_helper snd_seq_device cryptd drm joydev iwlwifi snd_timer serio_raw i2c_algo_bit cfg80211 bnep dell_smo8800 wmi rfcomm bluetooth snd mei_me soundcore 6lowpan_iphc shpchp video lpc_ich mei mac_hid nfsd auth_rpcgss nfs_acl parport_pc nfs ppdev lockd sunrpc fscache lp parport binfmt_misc psmouse e1000e ahci sdhci_pci libahci sdhci ptp pps_core
[39724.821659] CPU: 1 PID: 1531 Comm: Xorg Tainted: G           OE 3.16.0-34-generic #47-Ubuntu
[39724.821663] Hardware name: Dell Inc. Latitude E6420/0K0DNP, BIOS A21 11/14/2013
[39724.821667]  0000000000000009 ffff880036ebbbf8 ffffffff8178416e 0000000000000000
[39724.821673]  ffff880036ebbc30 ffffffff8106fefd 0000000000000000 ffff88021ed1e000
[39724.821679]  ffff8800c53c8210 ffff880220d50800 ffff880220d50800 ffff880036ebbc40
[39724.821685] Call Trace:
[39724.821696]  [<ffffffff8178416e>] dump_stack+0x45/0x56
[39724.821706]  [<ffffffff8106fefd>] warn_slowpath_common+0x7d/0xa0
[39724.821712]  [<ffffffff8106ffda>] warn_slowpath_null+0x1a/0x20
[39724.821750]  [<ffffffffc075a0fc>] intel_crtc_wait_for_pending_flips+0x16c/0x180 [i915]
[39724.821760]  [<ffffffff810b9780>] ? prepare_to_wait_event+0x100/0x100
[39724.821792]  [<ffffffffc075cbc3>] intel_crtc_disable_planes+0x33/0x1c0 [i915]
[39724.821823]  [<ffffffffc075d190>] ironlake_crtc_disable+0x50/0x970 [i915]
[39724.821857]  [<ffffffffc05b4f53>] ? drm_modeset_lock+0x33/0xf0 [drm]
[39724.821864]  [<ffffffff81789f42>] ? mutex_lock+0x12/0x30
[39724.821898]  [<ffffffffc075e537>] intel_crtc_update_dpms+0x67/0xa0 [i915]
[39724.821931]  [<ffffffffc0762bc9>] intel_connector_dpms+0x59/0x70 [i915]
[39724.821960]  [<ffffffffc05abe19>] drm_mode_obj_set_property_ioctl+0x399/0x3a0 [drm]
[39724.821985]  [<ffffffffc05abe50>] drm_mode_connector_property_set_ioctl+0x30/0x40 [drm]
[39724.822005]  [<ffffffffc059aa4f>] drm_ioctl+0x1df/0x680 [drm]
[39724.822016]  [<ffffffff811f5c98>] do_vfs_ioctl+0x2c8/0x4a0
[39724.822023]  [<ffffffff811e4191>] ? __sb_end_write+0x31/0x60
[39724.822029]  [<ffffffff811f5ef1>] SyS_ioctl+0x81/0xa0
[39724.822037]  [<ffffffff8178c1ad>] system_call_fastpath+0x1a/0x1f
[39724.822041] ---[ end trace 30f86b563b49a4f6 ]---