Additional info:
reporter:       libreport-2.1.12
WARNING: CPU: 0 PID: 23101 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: rfcomm fuse ip6t_rpfilter ip6t_REJECT xt_conntrack 8021q garp mrp fcoe libfcoe libfc scsi_transport_fc scsi_tgt 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 iTCO_wdt iTCO_vendor_support snd_hda_codec_conexant x86_pkg_temp_thermal coretemp kvm crct10dif_pclmul crc32_pclmul crc32c_intel arc4 snd_hda_intel iwldvm snd_hda_codec ghash_clmulni_intel cdc_mbim snd_hwdep mac80211 microcode snd_seq serio_raw cdc_ncm snd_seq_device usbnet mii cdc_wdm uvcvideo sdhci_pci iwlwifi cdc_acm videobuf2_vmalloc videobuf2_memops sdhci videobuf2_core e1000e i2c_i801 videodev mmc_core btusb media lpc_ich snd_pcm mfd_core bluetooth thinkpad_acpi mei_me cfg80211 ptp mei snd_page_alloc pps_core snd_timer snd shpchp wmi soundcore rfkill binfmt_misc i915 i2c_algo_bit drm_kms_helper drm i2c_core video
CPU: 0 PID: 23101 Comm: kworker/u16:11 Not tainted 3.13.3-201.fc20.x86_64 #1
Hardware name: LENOVO 4174PEG/4174PEG, BIOS 8CET51WW (1.31 ) 11/29/2011
Workqueue: i915 gen6_force_wake_work [i915]
 0000000000000009 ffff8800bf90fd38 ffffffff81686b48 ffff8800bf90fd80
 ffff8800bf90fd70 ffffffff8106d47d ffff8802103e8020 ffff8802103e8028
 0000000000000206 ffff88003720b400 0000000000000200 ffff8800bf90fdd0
Call Trace:
 [<ffffffff81686b48>] dump_stack+0x45/0x56
 [<ffffffff8106d47d>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8106d4ec>] warn_slowpath_fmt+0x4c/0x50
 [<ffffffff810125ce>] ? __switch_to+0x13e/0x4d0
 [<ffffffffa00f8b78>] gen6_gt_check_fifodbg.isra.9+0x38/0x50 [i915]
 [<ffffffffa00f8bb8>] __gen6_gt_force_wake_put+0x28/0x30 [i915]
 [<ffffffffa00f8947>] gen6_force_wake_work+0x37/0x50 [i915]
 [<ffffffff81087b86>] process_one_work+0x176/0x430
 [<ffffffff810887bb>] worker_thread+0x11b/0x3a0
 [<ffffffff810886a0>] ? rescuer_thread+0x350/0x350
 [<ffffffff8108f242>] kthread+0xd2/0xf0
 [<ffffffff8108f170>] ? insert_kthread_work+0x40/0x40
 [<ffffffff81695a7c>] ret_from_fork+0x7c/0xb0
 [<ffffffff8108f170>] ? insert_kthread_work+0x40/0x40