Additional info:
reporter:       libreport-2.2.1
WARNING: CPU: 3 PID: 12647 at drivers/gpu/drm/i915/intel_uncore.c:125 gen6_gt_check_fifodbg.isra.9+0x3d/0x50 [i915]()
MMIO read or write has been dropped ffffffff
Modules linked in: 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 iTCO_wdt iTCO_vendor_support rtsx_pci_ms rtsx_pci_sdmmc memstick hp_wmi mmc_core sparse_keymap x86_pkg_temp_thermal coretemp kvm_intel uvcvideo kvm videobuf2_vmalloc videobuf2_memops videobuf2_core crc32_pclmul videodev arc4 crc32c_intel media snd_hda_codec_hdmi microcode snd_hda_codec_idt rtl8192ce rtl_pci usb_storage rtlwifi rtl8192c_common mac80211 serio_raw snd_hda_intel
snd_hda_codec snd_hwdep cfg80211 snd_seq atl1c snd_seq_device rfkill rtsx_pci wmi snd_pcm hp_accel lis3lv02d input_polldev snd_page_alloc snd_timer snd lpc_ich mei_me mfd_core mei soundcore i2c_i801 i915 i2c_algo_bit drm_kms_helper drm i2c_core video
IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
CPU: 3 PID: 12647 Comm: kworker/u16:12 Not tainted 3.13.9-200.fc20.i686+PAE #1
Hardware name: Hewlett-Packard HP Pavilion dm4 Notebook PC/1650, BIOS F.13 09/28/2011
Workqueue: i915 gen6_force_wake_work [i915]
00000000 00000000 dcc19e88 c09c3d8b dcc19ec8 dcc19eb8 c045608e f8363db0
dcc19ee4 00003167 f8363d8c 0000007d f834785d f834785d f6dd8048 f6dd8014
00000282 dcc19ed0 c04560e3 00000009 dcc19ec8 f8363db0 dcc19ee4 dcc19eec
Call Trace:
[<c09c3d8b>] dump_stack+0x41/0x52
[<c045608e>] warn_slowpath_common+0x7e/0xa0
[<f834785d>] ? gen6_gt_check_fifodbg.isra.9+0x3d/0x50 [i915]
[<f834785d>] ? gen6_gt_check_fifodbg.isra.9+0x3d/0x50 [i915]
[<c04560e3>] warn_slowpath_fmt+0x33/0x40
[<f834785d>] gen6_gt_check_fifodbg.isra.9+0x3d/0x50 [i915]
[<f8347894>] __gen6_gt_force_wake_put+0x24/0x30 [i915]
[<f834763c>] gen6_force_wake_work+0x2c/0x40 [i915]
[<c046cf85>] process_one_work+0x115/0x380
[<c046b1f5>] ? start_worker+0x25/0x30
[<c046d8d5>] ? manage_workers.isra.28+0x1a5/0x250
[<c046da7e>] worker_thread+0xfe/0x330
[<c046d980>] ? manage_workers.isra.28+0x250/0x250
[<c0473231>] kthread+0xa1/0xc0
[<c0470000>] ? alloc_pid+0x50/0x400
[<c09d0ef7>] ret_from_kernel_thread+0x1b/0x28
[<c0473190>] ? insert_kthread_work+0x30/0x30