Additional info:
reporter:       libreport-2.3.0
WARNING: CPU: 2 PID: 1392 at drivers/gpu/drm/i915/intel_display.c:3473 intel_crtc_wait_for_pending_flips+0x1a6/0x200 [i915]()
Modules linked in: uas usb_storage ccm xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun nf_conntrack_netbios_ns nf_conntrack_broadcast ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 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 arc4 iwlmvm mac80211 intel_rapl iTCO_wdt iTCO_vendor_support x86_pkg_temp_thermal ppdev hp_wmi sparse_keymap coretemp iwlwifi kvm_intel kvm cfg80211 uvcvideo videobuf2_vmalloc videobuf2_core btusb videobuf2_memops v4l2_common bluetooth videodev snd_hda_codec_idt snd_hda_codec_generic
 snd_hda_codec_hdmi tpm_infineon serio_raw snd_hda_intel media snd_hda_controller joydev snd_hda_codec snd_hwdep rtsx_pci_ms snd_seq lpc_ich memstick snd_seq_device i2c_i801 snd_pcm rfkill shpchp mei_me mei parport_pc wmi snd_timer parport hp_accel lis3lv02d snd input_polldev soundcore tpm_tis hp_wireless tpm nfsd auth_rpcgss nfs_acl lockd grace sunrpc dm_crypt hid_logitech_dj i915 rtsx_pci_sdmmc mmc_core crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel i2c_algo_bit drm_kms_helper rtsx_pci e1000e drm mfd_core video ptp pps_core
CPU: 2 PID: 1392 Comm: Xorg.bin Not tainted 3.18.3-201.fc21.x86_64 #1
Hardware name: Hewlett-Packard HP EliteBook 840 G1/198F, BIOS L71 Ver. 01.20 07/28/2014
 0000000000000000 000000007e53a1a4 ffff880097c1fb98 ffffffff8175da66
 0000000000000000 0000000000000000 ffff880097c1fbd8 ffffffff81099181
 0000000000000000 ffff8800369b81a8 ffff880230bb8430 ffff880233764000
Call Trace:
 [<ffffffff8175da66>] dump_stack+0x46/0x58
 [<ffffffff81099181>] warn_slowpath_common+0x81/0xa0
 [<ffffffff8109929a>] warn_slowpath_null+0x1a/0x20
 [<ffffffffa01938c6>] intel_crtc_wait_for_pending_flips+0x1a6/0x200 [i915]
 [<ffffffff810da560>] ? abort_exclusive_wait+0xb0/0xb0
 [<ffffffffa01939c8>] intel_primary_plane_disable+0xa8/0xe0 [i915]
 [<ffffffffa0030eb7>] __setplane_internal+0x197/0x290 [drm]
 [<ffffffffa003f309>] ? drm_modeset_lock_all_crtcs+0x49/0x70 [drm]
 [<ffffffffa003f6ae>] ? __drm_modeset_lock_all+0xee/0x120 [drm]
 [<ffffffffa0034288>] drm_mode_setplane+0x198/0x240 [drm]
 [<ffffffffa0025aaf>] drm_ioctl+0x1df/0x680 [drm]
 [<ffffffff81258d43>] ? inotify_handle_event+0xe3/0x180
 [<ffffffff81229fa0>] do_vfs_ioctl+0x2d0/0x4b0
 [<ffffffff81217e01>] ? __sb_end_write+0x11/0x70
 [<ffffffff8122a201>] SyS_ioctl+0x81/0xa0
 [<ffffffff8113acb6>] ? __audit_syscall_exit+0x1f6/0x2a0
 [<ffffffff817647a9>] system_call_fastpath+0x12/0x17