Additional info:
reporter:       libreport-2.2.2
WARNING: CPU: 1 PID: 889 at drivers/gpu/drm/i915/intel_dp.c:2747 intel_dp_link_down+0x1d2/0x210 [i915]()
Modules linked in: ip6table_filter ip6_tables ebtable_nat ebtables nfnetlink_queue nfnetlink_log nfnetlink tun tcp_lp rfcomm fuse bnep iTCO_wdt iTCO_vendor_support ppdev hp_wmi sparse_keymap bridge stp llc pl2303 snd_hda_codec_hdmi snd_hda_codec_idt vfat fat x86_pkg_temp_thermal coretemp kvm_intel kvm crct10dif_pclmul arc4 crc32_pclmul crc32c_intel ghash_clmulni_intel iwldvm microcode mac80211 btusb serio_raw iwlwifi bluetooth uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core videodev cfg80211 media joydev sdhci_pci sdhci rfkill mmc_core snd_hda_intel snd_hda_codec parport_pc snd_hwdep snd_seq snd_seq_device parport tpm_tis snd_pcm tpm_infineon tpm hp_accel lis3lv02d input_polldev wmi e1000e snd_page_alloc snd_timer ptp mei_me lpc_ich shpchp snd pps_core mfd_core mei soundcore nfsd auth_rpcgss nfs_acl lockd sunrpc btrfs libcrc32c xor raid6_pq i915 i2c_algo_bit drm_kms_helper drm firewire_ohci firewire_core crc_itu_t i2c_core video [last unloaded: iptable_raw]
CPU: 1 PID: 889 Comm: Xorg Not tainted 3.13.9-200.fc20.x86_64 #1
Hardware name: Hewlett-Packard HP EliteBook 8570p/17A7, BIOS 68ICF Ver. F.45 10/07/2013
 0000000000000009 ffff8804114a7c08 ffffffff81687dac 0000000000000000
 ffff8804114a7c40 ffffffff8106d4dd ffff88003fb188c8 ffff880425b7f800
 ffff88003f9e4000 0000000080180344 ffff880425714000 ffff8804114a7c50
Call Trace:
 [<ffffffff81687dac>] dump_stack+0x45/0x56
 [<ffffffff8106d4dd>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8106d5ba>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa00f7882>] intel_dp_link_down+0x1d2/0x210 [i915]
 [<ffffffffa00fbbb0>] intel_disable_dp+0x70/0x80 [i915]
 [<ffffffffa00e04fe>] ironlake_crtc_disable+0x1ae/0x940 [i915]
 [<ffffffff8114c185>] ? filemap_fault+0xa5/0x420
 [<ffffffff811b01d6>] ? mem_cgroup_update_page_stat+0x16/0x50
 [<ffffffffa00e6abf>] intel_crtc_update_dpms+0x6f/0xa0 [i915]
 [<ffffffffa00ea429>] intel_connector_dpms+0x59/0x70 [i915]
 [<ffffffffa00553f8>] drm_mode_obj_set_property_ioctl+0x328/0x340 [drm]
 [<ffffffffa0055440>] drm_mode_connector_property_set_ioctl+0x30/0x40 [drm]
 [<ffffffffa0044b52>] drm_ioctl+0x502/0x630 [drm]
 [<ffffffff811cbae8>] do_vfs_ioctl+0x2d8/0x4a0
 [<ffffffff811cbd31>] SyS_ioctl+0x81/0xa0
 [<ffffffff81696d69>] system_call_fastpath+0x16/0x1b