Additional info:
reporter:       libreport-2.1.11
WARNING: CPU: 1 PID: 9506 at drivers/gpu/drm/i915/intel_uncore.c:125 gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915]()
MMIO read or write has been dropped ffffffff
Modules linked in: ccm rfcomm fuse ipt_MASQUERADE xt_CHECKSUM tun ip6t_rpfilter ip6t_REJECT xt_conntrack joydev hid_lenovo_tpkbd iTCO_wdt bnep iTCO_vendor_support 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 iwldvm mac80211 snd_hda_codec_hdmi snd_hda_codec_realtek iwlwifi sdhci_pci cfg80211 sdhci mmc_core x86_pkg_temp_thermal coretemp kvm_intel kvm crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel microcode serio_raw uvcvideo i2c_i801 snd_hda_intel videobuf2_vmalloc videobuf2_memops videobuf2_core snd_hda_codec snd_hwdep btusb snd_seq bluetooth snd_seq_device snd_pcm videodev media snd_page_alloc lpc_ich snd_timer mfd_core shpchp e1000e ptp pps_core mei_me mei thinkpad_acpi wmi snd soundcore rfkill tpm_tis tpm binfmt_misc i915 i2c_algo_bit drm_kms_helper drm i2c_core video
CPU: 1 PID: 9506 Comm: kworker/u16:5 Not tainted 3.13.0-1.fc21.x86_64 #1
Hardware name: LENOVO 23445HU/23445HU, BIOS G1ET93WW (2.53 ) 03/08/2013
Workqueue: i915 gen6_force_wake_work [i915]
 0000000000000009 ffff8801db315d38 ffffffff81685ffa ffff8801db315d80
 ffff8801db315d70 ffffffff8106d5ed ffff880210190020 ffff880210190028
 0000000000000282 ffff880210962500 0000000000000200 ffff8801db315dd0
Call Trace:
 [<ffffffff81685ffa>] dump_stack+0x45/0x56
 [<ffffffff8106d5ed>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8106d65c>] warn_slowpath_fmt+0x4c/0x50
 [<ffffffff810125ce>] ? __switch_to+0x13e/0x4d0
 [<ffffffffa00e7ae8>] gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915]
 [<ffffffffa00e7b8b>] __gen6_gt_force_wake_mt_put+0x2b/0x30 [i915]
 [<ffffffffa00e78b7>] gen6_force_wake_work+0x37/0x50 [i915]
 [<ffffffff81087cf6>] process_one_work+0x176/0x430
 [<ffffffff8108892b>] worker_thread+0x11b/0x3a0
 [<ffffffff81088810>] ? rescuer_thread+0x350/0x350
 [<ffffffff8108f3b2>] kthread+0xd2/0xf0
 [<ffffffff8108f2e0>] ? insert_kthread_work+0x40/0x40
 [<ffffffff81694f3c>] ret_from_fork+0x7c/0xb0
 [<ffffffff8108f2e0>] ? insert_kthread_work+0x40/0x40