Description of problem:
Undocked from thinkpad ultra dock and it produced this kernel crash. 

Additional info:
reporter:       libreport-2.1.10
WARNING: CPU: 3 PID: 1097 at drivers/gpu/drm/i915/intel_dp.c:2538 intel_dp_link_down+0x1dc/0x210 [i915]()
Modules linked in: tun rfcomm fuse nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE ip6t_REJECT 8021q garp fcoe mrp libfcoe libfc scsi_transport_fc scsi_tgt xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw bnep arc4 iwldvm mac80211 snd_hda_codec_hdmi iwlwifi snd_hda_codec_conexant cfg80211 sdhci_pci sdhci iTCO_wdt mmc_core iTCO_vendor_support x86_pkg_temp_thermal coretemp kvm_intel kvm snd_usb_audio snd_hda_intel snd_usbmidi_lib snd_hda_codec snd_rawmidi snd_hwdep uvcvideo snd_seq videobuf2_vmalloc microcode serio_raw i2c_i801 snd_seq_device snd_pcm lpc_ich mfd_core videobuf2_memops videobuf2_core videodev hid_lenovo_tpkbd media btusb bluetooth snd_page_alloc e1000e snd_timer shpchp mei_me ptp thinkpad_acpi pps_core mei snd wmi soundcore rfkill binfmt_misc dm_crypt i915 crct10dif_pclmul crc32_pclmul crc32c_intel i2c_algo_bit drm_kms_helper ghash_clmulni_intel drm i2c_core video ecryptfs encrypted_keys trusted tpm tpm_bios
CPU: 3 PID: 1097 Comm: Xorg Not tainted 3.12.6-300.fc20.x86_64 #1
Hardware name: LENOVO 4286CTO/4286CTO, BIOS 8DET52WW (1.22 ) 09/15/2011
 0000000000000009 ffff8803fe793c00 ffffffff816630c1 0000000000000000
 ffff8803fe793c38 ffffffff810691dd ffff8804046580c8 ffff880407942800
 ffff8804078e1000 0000000080980344 ffff880404f48000 ffff8803fe793c48
Call Trace:
 [<ffffffff816630c1>] dump_stack+0x45/0x56
 [<ffffffff810691dd>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff810692ba>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa01192cc>] intel_dp_link_down+0x1dc/0x210 [i915]
 [<ffffffffa011bc88>] intel_disable_dp+0x68/0x70 [i915]
 [<ffffffffa0105f7a>] ironlake_crtc_disable+0x19a/0x950 [i915]
 [<ffffffffa010a2ef>] intel_crtc_update_dpms+0x6f/0xa0 [i915]
 [<ffffffffa010dc39>] intel_connector_dpms+0x59/0x70 [i915]
 [<ffffffffa0070778>] drm_mode_obj_set_property_ioctl+0x308/0x320 [drm]
 [<ffffffffa00707c0>] drm_mode_connector_property_set_ioctl+0x30/0x40 [drm]
 [<ffffffffa005fc32>] drm_ioctl+0x502/0x630 [drm]
 [<ffffffff8154cd71>] ? sock_aio_read+0x21/0x40
 [<ffffffff811ade7a>] ? do_sync_read+0x5a/0x90
 [<ffffffff811c0cdd>] do_vfs_ioctl+0x2dd/0x4b0
 [<ffffffff811ae4c7>] ? vfs_read+0xf7/0x170
 [<ffffffff811c0f31>] SyS_ioctl+0x81/0xa0
 [<ffffffff81672129>] system_call_fastpath+0x16/0x1b