Additional info:
reporter:       libreport-2.2.3
WARNING: CPU: 0 PID: 1044 at drivers/gpu/drm/i915/intel_display.c:3361 intel_crtc_wait_for_pending_flips+0x1a5/0x1b0 [i915]()
Modules linked in: vhost_net vhost macvtap macvlan nf_conntrack_ipv6 nf_defrag_ipv6 xt_AUDIT binfmt_misc ipt_MASQUERADE iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack xt_CHECKSUM iptable_mangle tun bridge stp llc ip6table_filter ip6_tables ebtable_nat ebtables fuse bnep nfnetlink_queue nfnetlink_log nfnetlink bluetooth cfg80211 rfkill ipheth snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic x86_pkg_temp_thermal coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel iTCO_wdt gpio_ich iTCO_vendor_support ppdev snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm i2c_i801 microcode serio_raw e1000e r8169 lpc_ich mii snd_timer mfd_core mei_me snd ptp mei pps_core soundcore
wmi parport_pc tpm_tis parport tpm nfsd auth_rpcgss nfs_acl lockd sunrpc i915 i2c_algo_bit video drm_kms_helper drm
CPU: 0 PID: 1044 Comm: Xorg Not tainted 3.17.4-200.fc20.x86_64 #1
Hardware name: LENOVO 5032BE4/        , BIOS 9HKT53AUS 07/18/2012
0000000000000000 000000002e7f80d0 ffff88040ff4f908 ffffffff81726d2c
0000000000000000 ffff88040ff4f940 ffffffff81092e6d 0000000000000000
ffff88042505b000 ffff880036e582c0 ffff880425056000 ffff880425056360
Call Trace:
[<ffffffff81726d2c>] dump_stack+0x45/0x56
[<ffffffff81092e6d>] warn_slowpath_common+0x7d/0xa0
[<ffffffff81092f9a>] warn_slowpath_null+0x1a/0x20
[<ffffffffa00cd805>] intel_crtc_wait_for_pending_flips+0x1a5/0x1b0 [i915]
[<ffffffff810d1830>] ? prepare_to_wait_event+0xf0/0xf0
[<ffffffffa00d90e8>] intel_crtc_set_config+0x9a8/0xe60 [i915]
[<ffffffffa000f584>] drm_mode_set_config_internal+0x64/0xf0 [drm]
[<ffffffffa0068c13>] restore_fbdev_mode+0xb3/0xe0 [drm_kms_helper]
[<ffffffffa0068c63>] drm_fb_helper_restore_fbdev_mode_unlocked+0x23/0x40 [drm_kms_helper]
[<ffffffffa006a878>] drm_fb_helper_set_par+0x28/0x70 [drm_kms_helper]
[<ffffffffa00e3dea>] intel_fbdev_set_par+0x1a/0x60 [i915]
[<ffffffff813e00b7>] fb_set_var+0x197/0x440
[<ffffffffa00697a4>] ? drm_fb_helper_setcmap+0x454/0x470 [drm_kms_helper]
[<ffffffff813da72f>] ? bit_putcs+0x30f/0x590
ipheth 2-1.3:4.2: Apple iPhone USB Ethernet device attached
[<ffffffff810c6b97>] ? update_curr+0x67/0x160
[<ffffffff813d6a51>] fbcon_blank+0x1f1/0x2f0
[<ffffffff81457758>] do_unblank_screen+0xb8/0x1f0
[<ffffffff8144d5ca>] complete_change_console+0x5a/0xe0
[<ffffffff8144e625>] vt_ioctl+0xfd5/0x1190
[<ffffffff814421c9>] tty_ioctl+0x289/0xb70
[<ffffffff8123e1c8>] ? fsnotify+0x238/0x310
[<ffffffff81212e50>] do_vfs_ioctl+0x2e0/0x4a0
[<ffffffff81213091>] SyS_ioctl+0x81/0xa0
[<ffffffff8172e3e9>] system_call_fastpath+0x16/0x1b