Description of problem:
Unplugged or plugged in a monitor to the DisplayPort

Additional info:
reporter:       libreport-2.1.12
WARNING: CPU: 2 PID: 811 at drivers/gpu/drm/i915/intel_display.c:844 intel_wait_for_pipe_off+0x108/0x1e0 [i915]()
pipe_off wait timed out
Modules linked in: ipt_MASQUERADE rfcomm xt_CHECKSUM tun fuse ip6t_rpfilter ip6t_REJECT 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 snd_hda_codec_hdmi snd_hda_codec_conexant arc4 iTCO_wdt iTCO_vendor_support iwldvm mac80211 iwlwifi cfg80211 sdhci_pci sdhci mmc_core mxm_wmi coretemp kvm_intel kvm microcode uvcvideo joydev videobuf2_vmalloc videobuf2_memops videobuf2_core videodev media i2c_i801 serio_raw snd_hda_intel snd_hda_codec intel_ips snd_hwdep snd_seq snd_seq_device snd_pcm btusb bluetooth lpc_ich thinkpad_acpi mfd_core snd_page_alloc rfkill mei_me snd_timer mei e1000e shpchp snd soundcore ptp pps_core wmi acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd binfmt_misc sunrpc dm_crypt btrfs libcrc32c xor raid6_pq crct10dif_pclmul crc32_pclmul crc32c_intel i915 ghash_clmulni_intel i2c_algo_bit firewire_ohci drm_kms_helper firewire_core drm crc_itu_t i2c_core video loop
CPU: 2 PID: 811 Comm: Xorg Not tainted 3.12.10-300.fc20.x86_64 #1
Hardware name: LENOVO 2522BQ9/2522BQ9, BIOS 6IET85WW (1.45 ) 02/14/2013
 0000000000000009 ffff8800b1971bb8 ffffffff81667ed5 ffff8800b1971c00
 ffff8800b1971bf0 ffffffff8106903d 0000000000070008 ffff88022d6ac000
 00000000fffd0317 ffff8800b1971fd8 ffff88022db04c18 ffff8800b1971c50
Call Trace:
 [<ffffffff81667ed5>] dump_stack+0x45/0x56
 [<ffffffff8106903d>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff810690ac>] warn_slowpath_fmt+0x4c/0x50
 [<ffffffffa00ec098>] intel_wait_for_pipe_off+0x108/0x1e0 [i915]
 [<ffffffffa00ec202>] intel_disable_pipe+0x92/0xa0 [i915]
 [<ffffffffa00eef46>] ironlake_crtc_disable+0xd6/0x950 [i915]
 [<ffffffffa00f337f>] intel_crtc_update_dpms+0x6f/0xa0 [i915]
 [<ffffffffa00f6cc9>] intel_connector_dpms+0x59/0x70 [i915]
 [<ffffffffa0037778>] drm_mode_obj_set_property_ioctl+0x308/0x320 [drm]
 [<ffffffffa00377c0>] drm_mode_connector_property_set_ioctl+0x30/0x40 [drm]
 [<ffffffffa0026c32>] drm_ioctl+0x502/0x630 [drm]
 [<ffffffff81552471>] ? sock_aio_read+0x21/0x40
 [<ffffffff811ae1aa>] ? do_sync_read+0x5a/0x90
 [<ffffffff811c100d>] do_vfs_ioctl+0x2dd/0x4b0
 [<ffffffff811ae7f7>] ? vfs_read+0xf7/0x170
 [<ffffffff811c1261>] SyS_ioctl+0x81/0xa0
 [<ffffffff81676ea9>] system_call_fastpath+0x16/0x1b