Additional info:
reporter:       libreport-2.2.0
WARNING: CPU: 1 PID: 9852 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: usb_storage 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 rtsx_pci_sdmmc rtsx_pci_ms hp_wmi iTCO_wdt mmc_core memstick sparse_keymap iTCO_vendor_support x86_pkg_temp_thermal coretemp kvm_intel snd_hda_codec_hdmi kvm arc4 crc32_pclmul snd_hda_codec_idt crc32c_intel microcode uvcvideo snd_hda_intel videobuf2_vmalloc snd_hda_codec videobuf2_memops serio_raw videobuf2_core videodev rtl8192ce snd_hwdep rtl_pci media rtlwifi snd_seq
snd_seq_device rtl8192c_common snd_pcm i2c_i801 mac80211 lpc_ich atl1c cfg80211 rtsx_pci snd_page_alloc mfd_core snd_timer snd mei_me rfkill mei soundcore wmi hp_accel lis3lv02d input_polldev i915 i2c_algo_bit drm_kms_helper drm i2c_core video
IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
CPU: 1 PID: 9852 Comm: kworker/u16:12 Not tainted 3.13.6-200.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 d413de88 c09c34dd d413dec8 d413deb8 c045607e f836ad78
d413dee4 0000267c f836ad54 0000007d f834e85d f834e85d efdec048 efdec014
00000202 d413ded0 c04560d3 00000009 d413dec8 f836ad78 d413dee4 d413deec
Call Trace:
[<c09c34dd>] dump_stack+0x41/0x52
[<c045607e>] warn_slowpath_common+0x7e/0xa0
[<f834e85d>] ? gen6_gt_check_fifodbg.isra.9+0x3d/0x50 [i915]
[<f834e85d>] ? gen6_gt_check_fifodbg.isra.9+0x3d/0x50 [i915]
[<c04560d3>] warn_slowpath_fmt+0x33/0x40
[<f834e85d>] gen6_gt_check_fifodbg.isra.9+0x3d/0x50 [i915]
[<f834e894>] __gen6_gt_force_wake_put+0x24/0x30 [i915]
[<f834e63c>] gen6_force_wake_work+0x2c/0x40 [i915]
[<c046cf65>] process_one_work+0x115/0x380
[<c046b1d5>] ? start_worker+0x25/0x30
[<c046d8b5>] ? manage_workers.isra.28+0x1a5/0x250
[<c046da5e>] worker_thread+0xfe/0x330
[<c046d960>] ? manage_workers.isra.28+0x250/0x250
[<c0473211>] kthread+0xa1/0xc0
[<c09d0677>] ret_from_kernel_thread+0x1b/0x28
[<c0473170>] ? insert_kthread_work+0x30/0x30