Additional info:
reporter:       libreport-2.2.3
WARNING: CPU: 5 PID: 1615 at drivers/gpu/drm/i915/intel_dp.c:3122 intel_dp_link_down+0x1a9/0x230 [i915]()
Modules linked in: 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 x86_pkg_temp_thermal coretemp kvm_intel iwlmvm kvm mac80211 iTCO_wdt iTCO_vendor_support uvcvideo iwlwifi joydev serio_raw microcode cfg80211 snd_hda_codec_realtek videobuf2_vmalloc i2c_i801 videobuf2_memops snd_hda_codec_generic snd_hda_codec_hdmi videobuf2_core rtsx_pci_ms snd_hda_intel memstick lpc_ich btusb v4l2_common
 snd_hda_controller bluetooth shpchp videodev snd_hda_codec snd_hwdep media snd_seq snd_seq_device mei_me mei snd_pcm thinkpad_acpi tpm_tis snd_timer tpm rfkill snd wmi soundcore dm_crypt hid_logitech_dj i915 rtsx_pci_sdmmc mmc_core i2c_algo_bit drm_kms_helper e1000e drm crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel ptp rtsx_pci i2c_core pps_core mfd_core video
CPU: 5 PID: 1615 Comm: Xorg.bin Not tainted 3.16.2-300.fc21.x86_64 #1
Hardware name: LENOVO 20BFS0EC00/20BFS0EC00, BIOS GMET62WW (2.10 ) 03/19/2014
 0000000000000000 000000005a47f62d ffff8803eeddb778 ffffffff8171c675
 0000000000000000 ffff8803eeddb7b0 ffffffff8108f25d ffff880036a20000
 0000000080000006 ffff8800c8e24000 0000000000000002 ffff880403df18d8
Call Trace:
 [<ffffffff8171c675>] dump_stack+0x45/0x56
 [<ffffffff8108f25d>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8108f38a>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa01af9e9>] intel_dp_link_down+0x1a9/0x230 [i915]
 [<ffffffffa01b4f45>] intel_dp_complete_link_train+0x105/0x390 [i915]
 [<ffffffffa01ace88>] intel_ddi_pre_enable+0x1a8/0x1f0 [i915]
 [<ffffffffa01948fc>] haswell_crtc_enable+0x3ac/0xa30 [i915]
 [<ffffffffa0197342>] __intel_set_mode+0x842/0x1680 [i915]
 [<ffffffffa019a8e6>] intel_set_mode+0x16/0x30 [i915]
 [<ffffffffa019b99a>] intel_crtc_set_config+0xa4a/0xda0 [i915]
 [<ffffffff81316326>] ? type_attribute_bounds_av+0x66/0x310
 [<ffffffffa00a6951>] drm_mode_set_config_internal+0x61/0xe0 [drm]
 [<ffffffffa0043c43>] restore_fbdev_mode+0xb3/0xe0 [drm_kms_helper]
 [<ffffffffa0043c93>] drm_fb_helper_restore_fbdev_mode_unlocked+0x23/0x40 [drm_kms_helper]
 [<ffffffffa0045778>] drm_fb_helper_set_par+0x28/0x70 [drm_kms_helper]
 [<ffffffff813e0090>] fb_set_var+0x190/0x420
 [<ffffffff8118e756>] ? free_hot_cold_page_list+0x46/0xa0
 [<ffffffff813d6459>] fbcon_blank+0x259/0x340
 [<ffffffff81457c0a>] do_unblank_screen+0xba/0x1f0
 [<ffffffff8144ec81>] vt_ioctl+0x13b1/0x1430
 [<ffffffff812ffbb7>] ? avc_alloc_node+0x27/0x130
 [<ffffffff8144233d>] tty_ioctl+0x2ad/0xbf0
 [<ffffffff81300379>] ? avc_has_perm+0xd9/0x1a0
 [<ffffffff81212170>] do_vfs_ioctl+0x2d0/0x4b0
 [<ffffffff811ffd1e>] ? ____fput+0xe/0x10
 [<ffffffff812123d1>] SyS_ioctl+0x81/0xa0
 [<ffffffff817234e9>] system_call_fastpath+0x16/0x1b