[12731.219417] WARNING: CPU: 3 PID: 2902 at /build/linux-dcxD3m/linux-4.4.0/drivers/gpu/drm/i915/intel_uncore.c:619 hsw_unclaimed_reg_debug+0x69/0x90 [i915]()
[12731.219418] Unclaimed register detected after reading register 0x22374
[12731.219419] Modules linked in: cpuid nls_utf8 ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c nvram msr ipt_MASQUERADE nf_nat_masquerade_ipv4 xfrm_user xfrm4_tunnel tunnel4 ipcomp xfrm_ipcomp esp4 ah4 af_key xfrm_algo rfcomm pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) drbg ansi_cprng ctr ccm xt_addrtype br_netfilter aufs xt_tcpudp ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 ipt_REJECT nf_reject_ipv4 xt_conntrack ip_set nfnetlink ebtable_nat ebtable_filter ebtable_broute bridge stp llc ebtables ip6table_raw ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_security ip6table_mangle ip6table_filter ip6_tables iptable_raw iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_security iptable_mangle iptable_filter ip_tables x_tables
[12731.219455]  bnep binfmt_misc nls_iso8859_1 uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_core v4l2_common videodev media btusb btrtl btbcm btintel bluetooth intel_rapl x86_pkg_temp_thermal snd_hda_codec_realtek snd_hda_codec_hdmi snd_hda_codec_generic snd_hda_intel intel_powerclamp snd_hda_codec coretemp crct10dif_pclmul crc32_pclmul snd_hda_core snd_hwdep arc4 snd_pcm aesni_intel snd_seq_midi snd_seq_midi_event iwlmvm mac80211 snd_rawmidi iwlwifi aes_x86_64 lrw gf128mul glue_helper snd_seq joydev snd_seq_device ablk_helper input_leds serio_raw snd_timer cryptd cfg80211 rtsx_pci_ms mei_me memstick snd mei lpc_ich mac_hid kvm_intel kvm irqbypass fujitsu_laptop shpchp soundcore intel_pch_thermal acpi_pad parport_pc ppdev lp parport autofs4 btrfs xor raid6_pq hid_generic usbhid
[12731.219491]  hid rtsx_pci_sdmmc i915 i2c_algo_bit ahci psmouse libahci drm_kms_helper syscopyarea sysfillrect r8169 sysimgblt mii rtsx_pci fb_sys_fops drm fjes video
[12731.219503] CPU: 3 PID: 2902 Comm: Xorg Tainted: G           OE   4.4.0-31-generic #50-Ubuntu
[12731.219504] Hardware name: FUJITSU LIFEBOOK A555/FJNBB3E, BIOS 1.19 08/13/2015
[12731.219505]  0000000000000086 0000000089a9afa3 ffff88015ecc3cd8 ffffffff813f1143
[12731.219507]  ffff88015ecc3d20 ffffffffc02441e0 ffff88015ecc3d10 ffffffff81081102
[12731.219509]  ffff880035220000 0000000000022374 0000000000000000 0000000000022374
[12731.219511] Call Trace:
[12731.219512]  <IRQ>  [<ffffffff813f1143>] dump_stack+0x63/0x90
[12731.219519]  [<ffffffff81081102>] warn_slowpath_common+0x82/0xc0
[12731.219521]  [<ffffffff8108119c>] warn_slowpath_fmt+0x5c/0x80
[12731.219539]  [<ffffffffc01bc4b9>] hsw_unclaimed_reg_debug+0x69/0x90 [i915]
[12731.219556]  [<ffffffffc01bf141>] gen6_read32+0xd1/0x1a0 [i915]
[12731.219572]  [<ffffffffc01b2655>] intel_lrc_irq_handler+0xe5/0x240 [i915]
[12731.219585]  [<ffffffffc016edc7>] gen8_gt_irq_handler+0x217/0x240 [i915]
[12731.219596]  [<ffffffffc016ee91>] gen8_irq_handler+0xa1/0x740 [i915]
[12731.219598]  [<ffffffff810dab8d>] handle_irq_event_percpu+0x8d/0x1d0
[12731.219600]  [<ffffffff810dad0e>] handle_irq_event+0x3e/0x60
[12731.219602]  [<ffffffff810de24d>] handle_edge_irq+0x7d/0x150
[12731.219608]  [<ffffffff8103117a>] handle_irq+0x1a/0x30
[12731.219611]  [<ffffffff8183051b>] do_IRQ+0x4b/0xd0
[12731.219613]  [<ffffffff8182e602>] common_interrupt+0x82/0x82
[12731.219614]  <EOI>  [<ffffffffc01712b0>] ? i915_handle_error+0x630/0x630 [i915]
[12731.219639]  [<ffffffffc01a061c>] ? __i915_add_request+0xfc/0x210 [i915]
[12731.219653]  [<ffffffffc0194c36>] i915_gem_execbuffer_retire_commands+0x26/0x30 [i915]
[12731.219668]  [<ffffffffc01b37fb>] intel_execlists_submission+0x2eb/0x410 [i915]
[12731.219682]  [<ffffffffc01945c0>] i915_gem_do_execbuffer.isra.25+0xfa0/0x12a0 [i915]
[12731.219696]  [<ffffffffc0195542>] i915_gem_execbuffer2+0xb2/0x240 [i915]
[12731.219711]  [<ffffffffc01a20e2>] ? i915_gem_busy_ioctl+0x92/0xe0 [i915]
[12731.219723]  [<ffffffffc0021742>] drm_ioctl+0x152/0x540 [drm]
[12731.219737]  [<ffffffffc0195490>] ? i915_gem_execbuffer+0x310/0x310 [i915]
[12731.219741]  [<ffffffff81220c0f>] do_vfs_ioctl+0x29f/0x490
[12731.219743]  [<ffffffff81220e79>] SyS_ioctl+0x79/0x90
[12731.219745]  [<ffffffff8182db32>] entry_SYSCALL_64_fastpath+0x16/0x71
[12731.219746] ---[ end trace 29ed9a695c00315e ]---
[14059.434239] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun