Additional info:
reporter:       libreport-2.1.9
WARNING: CPU: 3 PID: 662 at drivers/gpu/drm/i915/intel_pm.c:5408 gen6_gt_check_fifodbg+0x39/0x50 [i915]()
MMIO read or write has been dropped 3
Modules linked in: nls_utf8 udf crc_itu_t loop ses enclosure vfat fat nf_conntrack_netbios_ns nf_conntrack_broadcast ipt_MASQUERADE 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 fuse snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq snd_seq_device snd_pcm x86_pkg_temp_thermal ath3k coretemp snd_page_alloc kvm_intel arc4 ath9k ath9k_common ath9k_hw ath r8169 usb_storage uvcvideo mac80211 cfg80211 btusb bluetooth mii i2c_i801 kvm videobuf2_vmalloc videobuf2_memops videobuf2_core videodev snd_timer snd rfkill iTCO_wdt soundcore iTCO_vendor_support media lpc_ich mei_me mfd_core mei joydev shpchp wmi crc32_pclmul crc32c_intel ghash_clmulni_intel serio_raw microcode hid_multitouch mperf nfsd auth_rpcgss nfs_acl lockd sunrpc i915 ata_generic pata_acpi i2c_algo_bit drm_kms_helper drm video i2c_core
CPU: 3 PID: 662 Comm: Xorg Not tainted 3.11.10-301.fc20.x86_64 #1
Hardware name: SAMSUNG ELECTRONICS CO., LTD. P500A2D/DP500A2D-K01UB, BIOS P07KRM.058.130408.JJ 04/08/2013
 0000000000000009 ffff88018342ba78 ffffffff816441db ffff88018342bac0
 ffff88018342bab0 ffffffff8106715d ffff880193614000 ffff880193614040
 0000000000000206 0000000000000206 ffff8801936e2800 ffff88018342bb10
Call Trace:
 [<ffffffff816441db>] dump_stack+0x45/0x56
 [<ffffffff8106715d>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff810671cc>] warn_slowpath_fmt+0x4c/0x50
 [<ffffffffa00d7989>] gen6_gt_check_fifodbg+0x39/0x50 [i915]
 [<ffffffffa00d7a27>] __gen6_gt_force_wake_mt_put+0x27/0x30 [i915]
 [<ffffffffa00d7a63>] gen6_gt_force_wake_put+0x33/0x50 [i915]
 [<ffffffffa00dcbe0>] gen6_ring_put_irq+0xb0/0xe0 [i915]
 [<ffffffffa0097aa3>] __wait_seqno+0x393/0x520 [i915]
 [<ffffffff81089420>] ? wake_up_atomic_t+0x30/0x30
 [<ffffffffa00989d0>] i915_wait_seqno+0x70/0xa0 [i915]
 [<ffffffffa0098f0a>] i915_gem_object_wait_rendering+0x4a/0x80 [i915]
 [<ffffffffa009a367>] i915_gem_object_set_to_gtt_domain+0x47/0x160 [i915]
 [<ffffffffa009bca7>] i915_gem_pwrite_ioctl+0x287/0x860 [i915]
 [<ffffffff81075493>] ? __sigqueue_free.part.15+0x33/0x40
 [<ffffffff81075ca2>] ? dequeue_signal+0x32/0x160
 [<ffffffffa0020122>] drm_ioctl+0x512/0x640 [drm]
 [<ffffffff81078c6c>] ? signal_setup_done+0x3c/0x60
 [<ffffffff81012575>] ? do_signal+0x195/0x5e0
 [<ffffffff8101caa7>] ? __restore_xstate_sig+0x87/0x500
 [<ffffffff811bac7d>] do_vfs_ioctl+0x2dd/0x4b0
 [<ffffffff811baed1>] SyS_ioctl+0x81/0xa0
 [<ffffffff816533d9>] system_call_fastpath+0x16/0x1b