Additional info:
reporter:       libreport-2.2.2
WARNING: CPU: 2 PID: 11886 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: nfsv3 nfs_acl rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd sunrpc fscache usb_storage vfat fat mmc_block tcp_lp vhost_net vhost macvtap macvlan fuse ipt_MASQUERADE xt_CHECKSUM tun ccm 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 dm_crypt btusb x86_pkg_temp_thermal snd_hda_codec_hdmi bluetooth snd_hda_codec_conexant coretemp kvm_intel snd_hda_intel snd_hda_codec snd_hwdep sdhci_pci uvcvideo iTCO_wdt iTCO_vendor_support kvm videobuf2_vmalloc snd_seq videobuf2_memops sdhci videobuf2_core mmc_core crct10dif_pclmul videodev snd_seq_device crc32_pclmul crc32c_intel e1000e snd_pcm lpc_ich i2c_i801 joydev ghash_clmulni_intel arc4 iwldvm mac80211 iwlwifi cfg80211 mei_me mei snd_page_alloc media snd_timer thinkpad_acpi mfd_core microcode snd ptp serio_raw pps_core shpchp soundcore rfkill tpm_tis tpm wmi binfmt_misc i915 i2c_algo_bit drm_kms_helper drm i2c_core video
CPU: 2 PID: 11886 Comm: kworker/u16:68 Not tainted 3.13.3-201.fc20.x86_64 #1
Hardware name: LENOVO 4174BH4/4174BH4, BIOS 8CET51WW (1.31 ) 11/29/2011
Workqueue: i915 gen6_force_wake_work [i915]
 0000000000000009 ffff8800a8f4bd38 ffffffff81686b48 ffff8800a8f4bd80
 ffff8800a8f4bd70 ffffffff8106d47d ffff88020f80c020 ffff88020f80c028
 0000000000000206 ffff880210157800 0000000000000200 ffff8800a8f4bdd0
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