Description of problem:
Happens during normal operation, system was actually lcoked at the time it happened.

Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 2 PID: 2582 at drivers/gpu/drm/i915/intel_display.c:3361 intel_crtc_wait_for_pending_flips+0x1a1/0x1b0 [i915]()
Modules linked in: xt_addrtype dm_thin_pool dm_persistent_data dm_bio_prison libcrc32c loop rfcomm fuse ccm xt_CHECKSUM ipt_MASQUERADE tun nf_conntrack_netbios_ns nf_conntrack_broadcast 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 arc4 iwlmvm mac80211 x86_pkg_temp_thermal iTCO_wdt coretemp iTCO_vendor_support kvm_intel kvm iwlwifi cfg80211 uvcvideo snd_hda_codec_realtek btusb snd_hda_codec_hdmi snd_hda_codec_generic bluetooth videobuf2_vmalloc videobuf2_memops videobuf2_core
 v4l2_common snd_hda_intel videodev snd_hda_controller snd_hda_codec media joydev snd_hwdep serio_raw snd_seq i2c_i801 rtsx_pci_ms snd_seq_device memstick snd_pcm thinkpad_acpi tpm_tis mei_me wmi mei tpm rfkill snd_timer snd shpchp lpc_ich soundcore dm_crypt i915 rtsx_pci_sdmmc crct10dif_pclmul mmc_core e1000e crc32_pclmul crc32c_intel i2c_algo_bit drm_kms_helper drm ghash_clmulni_intel rtsx_pci ptp mfd_core pps_core video
CPU: 2 PID: 2582 Comm: Xorg.bin Not tainted 3.17.6-300.fc21.x86_64 #1
Hardware name: LENOVO 20ARS19C02/20ARS19C02, BIOS GJET80WW (2.30 ) 10/20/2014
 0000000000000000 000000006a312f36 ffff8802fdbbfbb8 ffffffff8173f8aa
 0000000000000000 ffff8802fdbbfbf0 ffffffff810970bd 0000000000000000
 ffff8800369582c0 ffff88030cd8c000 ffff88030cdf3000 0000000000000000
Call Trace:
 [<ffffffff8173f8aa>] dump_stack+0x45/0x56
 [<ffffffff810970bd>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff810971ea>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa01894d1>] intel_crtc_wait_for_pending_flips+0x1a1/0x1b0 [i915]
 [<ffffffff810d6e90>] ? abort_exclusive_wait+0xb0/0xb0
 [<ffffffffa0190bf4>] intel_crtc_disable_planes+0x34/0x160 [i915]
 [<ffffffffa0191b27>] haswell_crtc_disable+0x57/0x340 [i915]
 [<ffffffffa018adc9>] intel_crtc_control+0x49/0x100 [i915]
 [<ffffffffa018aee7>] intel_crtc_update_dpms+0x67/0x80 [i915]
 [<ffffffffa01940c9>] intel_connector_dpms+0x59/0x70 [i915]
 [<ffffffffa005d389>] drm_mode_obj_set_property_ioctl+0x399/0x3a0 [drm]
 [<ffffffffa005d3cf>] drm_mode_connector_property_set_ioctl+0x3f/0x60 [drm]
 [<ffffffffa004de6f>] drm_ioctl+0x1df/0x680 [drm]
 [<ffffffff810209c2>] ? __restore_xstate_sig+0xa2/0x660
 [<ffffffff81013758>] ? do_signal+0x1b8/0x800
 [<ffffffff81220910>] do_vfs_ioctl+0x2d0/0x4b0
 [<ffffffff81220b71>] SyS_ioctl+0x81/0xa0
 [<ffffffff81746d07>] ? int_check_syscall_exit_work+0x34/0x3d
 [<ffffffff81746a69>] system_call_fastpath+0x16/0x1b