This is present for:
- GNOME/Wayland session
- Ubuntu 17.10
- 4.13.0-36-generic
ie. any Ubuntu any kernel

tail --follow=name --retry /var/log/syslog
Mar  2 11:36:06 c89 kernel: [649937.206226] thunderbolt 0000:07:00.0: resetting 
error on 0:c.
Mar  2 11:36:06 c89 kernel: [649937.206258] thunderbolt 0000:07:00.0: 0:c: 
hotplug: scanning
Mar  2 11:36:06 c89 kernel: [649937.206261] thunderbolt 0000:07:00.0: 0:c: 
hotplug: no switch found
Mar  2 11:36:07 c89 kernel: [649937.685613] thunderbolt 0000:07:00.0: resetting 
error on 0:c.
Mar  2 11:36:07 c89 kernel: [649937.685645] thunderbolt 0000:07:00.0: 0:c: got 
unplug event for disconnected port, ignoring

Present since:
- always, but was earlier hidden by more severe i915 bugs

Happens when:
- many windows, or when opening many such as when restoring a crashed Chromium 
or LibreOffice session
- 2 external monitors via DisplayPort

Affect hardware:
- Product Name: MacBookPro12,1
lspci -v -s 00:02.0                                      [21/21]
00:02.0 VGA compatible controller: Intel Corporation Iris Graphics 6100 (rev 09)
 (prog-if 00 [VGA controller])                                                  
        Subsystem: Apple Inc. Iris Graphics 6100                                
        Flags: bus master, fast devsel, latency 0, IRQ 50                       
        Memory at c0000000 (64-bit, non-prefetchable) [size=16M]                
        Memory at b0000000 (64-bit, prefetchable) [size=256M]                   
        I/O ports at 3000 [size=64]                                             
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]              
        Capabilities: <access denied>                                           
        Kernel driver in use: i915                                              
        Kernel modules: i915

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  occasionally loses external monitor

Status in linux package in Ubuntu:

Bug description:
  Occasionally the screen will blank and all windows move from the
  external monitor to the laptop monitor.  Relatively immediately
  afterward both screens re-enable, but the windows don't move back to
  the external monitor.

  This usually appears to be triggered by a specific application, eg,
  "ScudCloud" (a slack client that embeds an HTML webkit view), or
  enabling the flash plugin in an existing firefox window.

  dmesg shows:
  [  174.404713] ------------[ cut here ]------------
  [  174.404736] WARNING: CPU: 0 PID: 1699 at 
i915_gem_track_fb+0x129/0x140 [i915]()
  [  174.404738] WARN_ON(!(old->frontbuffer_bits & frontbuffer_bits))
  [  174.404739] Modules linked in:
  [  174.404741]  bnep pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) 
vboxdrv(OE) asix usbnet mii xt_addrtype xt_conntrack ipt_MASQUERADE 
nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 
iptable_filter ip_tables x_tables nf_nat nf_conntrack bridge stp llc aufs 
nls_iso8859_1 applesmc input_polldev uvcvideo videobuf2_vmalloc 
videobuf2_memops videobuf2_core v4l2_common videodev media btusb btrtl btbcm 
btintel bluetooth snd_usb_audio snd_usbmidi_lib joydev input_leds bcm5974 
snd_hda_codec_hdmi x86_pkg_temp_thermal intel_powerclamp coretemp 
snd_hda_codec_cirrus kvm_intel snd_hda_codec_generic kvm snd_seq_midi 
snd_seq_midi_event brcmfmac snd_hda_intel brcmutil snd_hda_codec snd_hda_core 
cfg80211 snd_hwdep snd_rawmidi bdc_pci lpc_ich snd_pcm mei_me snd_seq mei 
  [  174.404776]  snd_timer thunderbolt snd sbs soundcore acpi_als kfifo_buf 
shpchp sbshc industrialio apple_gmux mac_hid apple_bl parport_pc ppdev lp 
parport autofs4 jitterentropy_rng drbg ansi_cprng algif_skcipher af_alg 
dm_crypt hid_plantronics hid_microsoft hid_logitech_hidpp hid_generic 
hid_logitech_dj hid_apple usbhid hid crct10dif_pclmul crc32_pclmul i915 
ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper 
i2c_algo_bit uas cryptd drm_kms_helper usb_storage drm ahci libahci video
  [  174.404803] CPU: 0 PID: 1699 Comm: gnome-shell Tainted: G           OE   
4.2.0-16-generic #19-Ubuntu
  [  174.404804] Hardware name: Apple Inc. MacBookPro11,4/Mac-06F11FD93F0323C5, 
BIOS MBP114.88Z.0172.B04.1506051511 06/05/2015
  [  174.404806]  0000000000000000 000000005f8a407a ffff8804613eba28 
  [  174.404808]  0000000000000000 ffff8804613eba80 ffff8804613eba68 
  [  174.404811]  ffff880465a30000 0000000000000001 ffff88046756e640 
  [  174.404813] Call Trace:
  [  174.404818]  [<ffffffff817e8c09>] dump_stack+0x45/0x57
  [  174.404823]  [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
  [  174.404825]  [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
  [  174.404836]  [<ffffffffc0238ec9>] i915_gem_track_fb+0x129/0x140 [i915]
  [  174.404852]  [<ffffffffc0281367>] intel_prepare_plane_fb+0xe7/0x1a0 [i915]
  [  174.404859]  [<ffffffffc00cdfa9>] 
drm_atomic_helper_prepare_planes+0x59/0xe0 [drm_kms_helper]
  [  174.404872]  [<ffffffffc027984e>] __intel_set_mode+0x1ae/0xb60 [i915]
  [  174.404886]  [<ffffffffc0280d16>] intel_crtc_set_config+0x2b6/0x580 [i915]
  [  174.404899]  [<ffffffffc0044ee5>] ? drm_mode_create+0x25/0x60 [drm]
  [  174.404908]  [<ffffffffc003e4c6>] drm_mode_set_config_internal+0x66/0x100 
  [  174.404917]  [<ffffffffc0042b29>] drm_mode_setcrtc+0x3e9/0x500 [drm]
  [  174.404923]  [<ffffffffc0033495>] drm_ioctl+0x125/0x610 [drm]
  [  174.404930]  [<ffffffffc0042740>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
  [  174.404934]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
  [  174.404936]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
  [  174.404939]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [  174.404941] ---[ end trace fc649a1af1173285 ]---
  [  175.018549] snd_hda_codec_hdmi hdaudioC0D0: HDMI: ELD buf size is 0, force 
  [  175.018587] snd_hda_codec_hdmi hdaudioC0D0: HDMI: invalid ELD data byte 0
  [  175.184359] thunderbolt 0000:07:00.0: resetting error on 0:c.
  [  175.184396] thunderbolt 0000:07:00.0: 0:c: hotplug: scanning
  [  175.184400] thunderbolt 0000:07:00.0: 0:c: hotplug: no switch found
  [  176.225350] thunderbolt 0000:07:00.0: resetting error on 0:c.
  [  176.225389] thunderbolt 0000:07:00.0: 0:c: got unplug event for 
disconnected port, ignoring
  [  181.480150] usb 1-1.3.1: reset high-speed USB device number 10 using 
  [  581.943528] usb 1-1.3.1: reset high-speed USB device number 10 using 

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-16-generic 4.2.0-16.19
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu3
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Mon Oct 26 07:38:02 2015
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=dd225ec0-47f4-49d8-a51c-a2547f8eb945
  InstallationDate: Installed on 2015-08-21 (66 days ago)
  InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150819)
  MachineType: Apple Inc. MacBookPro11,4
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-16-generic.efi.signed 
root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash vt.handoff=7
   linux-restricted-modules-4.2.0-16-generic N/A
   linux-backports-modules-4.2.0-16-generic  N/A
   linux-firmware                            1.149
   0: phy0: Wireless LAN
        Soft blocked: no
        Hard blocked: no
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install) 06/05/2015
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP114.88Z.0172.B04.1506051511 Mac-06F11FD93F0323C5
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro11,4
  dmi.chassis.type: 9
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-06F11FD93F0323C5
dmi:bvnAppleInc.:bvrMBP114.88Z.0172.B04.1506051511:bd06/05/2015:svnAppleInc.:pnMacBookPro11,4:pvr1.0:rvnAppleInc.:rnMac-06F11FD93F0323C5:rvrMacBookPro11,4:cvnAppleInc.:ct9:cvrMac-06F11FD93F0323C5: MacBookPro11,4
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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