Description of problem:
I just closed XFCE4-terminal window.

Additional info:
reporter:       libreport-2.1.10
WARNING: CPU: 3 PID: 5640 at drivers/gpu/drm/i915/intel_uncore.c:124 gen6_gt_check_fifodbg.isra.6+0x38/0x50 [i915]()
MMIO read or write has been dropped 3
Modules linked in: cpufreq_stats md4 nls_utf8 cifs dns_resolver fscache hidp rfcomm fuse 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 snd_hda_codec_hdmi snd_hda_codec_conexant iTCO_wdt iTCO_vendor_support snd_hda_intel arc4 x86_pkg_temp_thermal snd_hda_codec coretemp kvm_intel snd_hwdep kvm snd_seq iwldvm snd_seq_device uvcvideo videobuf2_vmalloc videobuf2_memops mac80211 microcode videobuf2_core videodev joydev media snd_pcm serio_raw i2c_i801 btusb snd_page_alloc bluetooth sdhci_pci iwlwifi e1000e snd_timer cfg80211 sdhci mmc_core ptp pps_core lpc_ich shpchp mfd_core mei_me mei thinkpad_acpi snd wmi soundcore tpm_tis tpm rfkill tpm_bios acpi_cpufreq binfmt_misc dm_crypt crct10dif_pclmul crc32_pclmul crc32c_intel i915 ghash_clmulni_intel i2c_algo_bit drm_kms_helper drm i2c_core video
CPU: 3 PID: 5640 Comm: Xorg Not tainted 3.12.5-302.fc20.x86_64 #1
Hardware name: LENOVO 4236MBG/4236MBG, BIOS 83ET66WW (1.36 ) 10/31/2011
 0000000000000009 ffff8800aec93a70 ffffffff81662d11 ffff8800aec93ab8
 ffff8800aec93aa8 ffffffff810691dd ffff88020f65c020 ffff88020f65c028
 0000000000000202 ffff88020f45a800 0000000000000202 ffff8800aec93b08
Call Trace:
 [<ffffffff81662d11>] dump_stack+0x45/0x56
 [<ffffffff810691dd>] warn_slowpath_common+0x7d/0xa0
 [<ffffffff8106924c>] warn_slowpath_fmt+0x4c/0x50
 [<ffffffffa00f5dfb>] ? i915_read32+0x6b/0x140 [i915]
 [<ffffffffa00f52b8>] gen6_gt_check_fifodbg.isra.6+0x38/0x50 [i915]
 [<ffffffffa00f52f8>] __gen6_gt_force_wake_put+0x28/0x30 [i915]
 [<ffffffffa00f5af3>] gen6_gt_force_wake_put+0x33/0x50 [i915]
 [<ffffffffa00ec4da>] gen6_ring_put_irq+0x8a/0xc0 [i915]
 [<ffffffffa00a16c3>] __wait_seqno+0x3a3/0x550 [i915]
 [<ffffffff8108be90>] ? wake_up_atomic_t+0x30/0x30
 [<ffffffffa00a2100>] i915_wait_seqno+0x70/0xa0 [i915]
 [<ffffffffa00a22fa>] i915_gem_object_wait_rendering+0x4a/0x80 [i915]
 [<ffffffffa00a4aaf>] i915_gem_object_set_to_gtt_domain+0x4f/0x1c0 [i915]
 [<ffffffffa00a84de>] i915_gem_pwrite_ioctl+0x80e/0x990 [i915]
 [<ffffffff81077853>] ? __sigqueue_free.part.15+0x33/0x40
 [<ffffffff81077f9b>] ? recalc_sigpending+0x1b/0x50
 [<ffffffff81078072>] ? dequeue_signal+0x32/0x160
 [<ffffffffa002cc32>] drm_ioctl+0x502/0x630 [drm]
 [<ffffffff8107b01c>] ? signal_setup_done+0x3c/0x60
 [<ffffffff81012575>] ? do_signal+0x195/0x5e0
 [<ffffffff8101cde7>] ? __restore_xstate_sig+0x87/0x500
 [<ffffffff811c0bbd>] do_vfs_ioctl+0x2dd/0x4b0
 [<ffffffff811c0e11>] SyS_ioctl+0x81/0xa0
 [<ffffffff81671d69>] system_call_fastpath+0x16/0x1b