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https://bugs.launchpad.net/bugs/1813763

Title:
  Screen freeze up after changing display mode to external display only

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Hardware: Lenovo ThinkPad X280 with Lenovo USB-C dock
  OS: Ubuntu Desktop 18.04.1 LTS, kernel 4.15.0-44-generic

  == Reproduce steps ==
  1. Connect one screen to Lenovo USB-C dock.
  2. Connect Lenovo ThinkPad X280 to Lenovo USB-C dock.
  3. Boot Ubuntu Linux and login. The external and built-in display will work 
in join display mode.
  4. Press Fn+F7 and select external display only.

  == Expected result ==
  Use the external display to display GUI.

  == Actual result ==
  The built-in display freeze up. Nothing (blank) on the external display.
  System does not respond to keyboard input.
  If there is an external keyboard connected, Num-lock indicator will not 
change after pressing Num-lock key on the external keyboard.

  Other processes are still running. If the Spotify is running, it will keep 
playing the music. Having a script as below will keep writing to a file
  while [ true ]; do
      date >> time-log.log
      sync
      sleep 1
  done

  == Additional information ==
  Not reproducible on Ubuntu 18.04.1 LiveUSB (kernel 4.15.0-29-generic)
  Not reproducible on kernel 4.15.0-43-generic (by selecting the kernel in GRUB)
  Always reproducible on kernel 4.15.0-44-generic
  Not reproducible if the screen is directly connected to the HDMI port on 
ThinkPad X280

  
  On kernel 4.15.0-43-generic, it will generate the following kernel message 
after selecting external display. The external display will work correctly.

  [   80.165447] thunderbolt 0000:04:00.0: control channel starting...
  [   80.165450] thunderbolt 0000:04:00.0: starting TX ring 0
  [   80.165457] thunderbolt 0000:04:00.0: enabling interrupt at register 
0x38200 bit 0 (0x0 -> 0x1)
  [   80.165458] thunderbolt 0000:04:00.0: starting RX ring 0
  [   80.165465] thunderbolt 0000:04:00.0: enabling interrupt at register 
0x38200 bit 12 (0x1 -> 0x1001)

  On kernel 4.15.0-44-generic, it will generate the following kernel message 
after selecting external display. The external display is blank and the 
built-in display will freeze.
  I run command "sleep 60 ; dmesg > dmesg.log" to record the kernel message 
after selecting external display, as the keyboard will become irresponsive.

  [  625.581884] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000245
  [  625.581980] IP: intel_ddi_post_disable+0x54/0x170 [i915]
  [  625.581986] PGD 0 P4D 0 
  [  625.581997] Oops: 0000 [#1] SMP PTI
  [  625.582002] Modules linked in: snd_usb_audio snd_usbmidi_lib hid_generic 
usbhid hid cdc_ether usbnet r8152 mii rfcomm ccm xt_CHECKSUM iptable_mangle 
ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat 
nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack libcrc32c ipt_REJECT 
nf_reject_ipv4 xt_tcpudp bridge stp llc cmac snd_hda_codec_hdmi ebtable_filter 
ebtables ip6table_filter ip6_tables devlink iptable_filter bnep 
snd_hda_codec_realtek snd_hda_codec_generic binfmt_misc joydev intel_rapl 
nls_iso8859_1 x86_pkg_temp_thermal arc4 intel_powerclamp coretemp kvm_intel kvm 
irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc snd_soc_skl 
aesni_intel snd_soc_skl_ipc aes_x86_64 crypto_simd glue_helper cryptd 
snd_hda_ext_core intel_cstate snd_soc_sst_dsp iwlmvm snd_soc_sst_ipc
  [  625.582114]  intel_rapl_perf snd_soc_acpi mac80211 snd_soc_core input_leds 
rmi_smbus uvcvideo snd_compress serio_raw ac97_bus intel_wmi_thunderbolt 
wmi_bmof rmi_core snd_pcm_dmaengine iwlwifi videobuf2_vmalloc snd_hda_intel 
snd_seq_midi videobuf2_memops snd_seq_midi_event videobuf2_v4l2 snd_hda_codec 
snd_rawmidi videobuf2_core cfg80211 btusb btrtl snd_hda_core videodev btbcm 
btintel snd_hwdep thinkpad_acpi media bluetooth snd_seq mei_me snd_pcm 
ucsi_acpi snd_seq_device typec_ucsi processor_thermal_device nvram ecdh_generic 
mei shpchp typec intel_soc_dts_iosf intel_pch_thermal snd_timer snd 
int3403_thermal soundcore int340x_thermal_zone acpi_pad int3400_thermal 
acpi_thermal_rel mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables 
x_tables autofs4 btrfs xor zstd_compress raid6_pq uas usb_storage
  [  625.582229]  i915 i2c_algo_bit drm_kms_helper nvme e1000e syscopyarea 
psmouse sysfillrect sysimgblt ptp fb_sys_fops i2c_i801 pps_core nvme_core drm 
thunderbolt wmi video
  [  625.582266] CPU: 6 PID: 1813 Comm: Xorg Not tainted 4.15.0-44-generic 
#47-Ubuntu
  [  625.582270] Hardware name: LENOVO 20KFS05Q00/20KFS05Q00, BIOS N20ET31W 
(1.16 ) 05/30/2018
  [  625.582344] RIP: 0010:intel_ddi_post_disable+0x54/0x170 [i915]
  [  625.582349] RSP: 0018:ffff9dacc3f97a60 EFLAGS: 00010297
  [  625.582356] RAX: 0000000000000007 RBX: ffff896954080000 RCX: 
ffffffffc0542272
  [  625.582361] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 
ffff896954080000
  [  625.582366] RBP: ffff9dacc3f97a90 R08: 0000000000000007 R09: 
0000000000000000
  [  625.582370] R10: 000000000000016f R11: 00000000000000d3 R12: 
0000000000000000
  [  625.582375] R13: ffff896954080000 R14: ffff896953e68000 R15: 
ffff896955324800
  [  625.582382] FS:  00007ff4b9034600(0000) GS:ffff896972580000(0000) 
knlGS:0000000000000000
  [  625.582388] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  625.582393] CR2: 0000000000000245 CR3: 0000000411fea004 CR4: 
00000000003606e0
  [  625.582397] Call Trace:
  [  625.582467]  ? intel_dp_sink_dpms+0xbb/0xf0 [i915]
  [  625.582531]  intel_mst_post_disable_dp+0x99/0xd0 [i915]
  [  625.582599]  intel_encoders_post_disable.isra.102+0x66/0x80 [i915]
  [  625.582660]  haswell_crtc_disable+0xe8/0x150 [i915]
  [  625.582724]  intel_atomic_commit_tail+0x7ea/0xd30 [i915]
  [  625.582784]  intel_atomic_commit+0x277/0x2b0 [i915]
  [  625.582826]  drm_atomic_commit+0x51/0x60 [drm]
  [  625.582858]  drm_atomic_connector_commit_dpms+0xef/0x100 [drm]
  [  625.582890]  drm_mode_obj_set_property_ioctl+0x176/0x280 [drm]
  [  625.582921]  ? drm_mode_connector_set_obj_prop+0x80/0x80 [drm]
  [  625.582947]  drm_mode_connector_property_set_ioctl+0x3f/0x60 [drm]
  [  625.582975]  drm_ioctl_kernel+0x5f/0xb0 [drm]
  [  625.583001]  drm_ioctl+0x31b/0x3d0 [drm]
  [  625.583027]  ? drm_mode_connector_set_obj_prop+0x80/0x80 [drm]
  [  625.583038]  ? __handle_mm_fault+0x478/0x5c0
  [  625.583047]  ? sock_poll+0x74/0x90
  [  625.583058]  do_vfs_ioctl+0xa8/0x630
  [  625.583064]  ? handle_mm_fault+0xb1/0x1f0
  [  625.583074]  SyS_ioctl+0x79/0x90
  [  625.583083]  do_syscall_64+0x73/0x130
  [  625.583093]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  625.583100] RIP: 0033:0x7ff4b642f5d7
  [  625.583105] RSP: 002b:00007ffffc24e798 EFLAGS: 00000246 ORIG_RAX: 
0000000000000010
  [  625.583112] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 
00007ff4b642f5d7
  [  625.583117] RDX: 00007ffffc24e7d0 RSI: 00000000c01064ab RDI: 
000000000000000c
  [  625.583121] RBP: 00007ffffc24e7d0 R08: 000055b2137c5cd0 R09: 
0000000000000008
  [  625.583126] R10: 000055b2137a4140 R11: 0000000000000246 R12: 
00000000c01064ab
  [  625.583131] R13: 000000000000000c R14: 000055b213409270 R15: 
000055b212cb7b70
  [  625.583137] Code: 0d f6 86 44 02 00 00 40 0f 85 81 00 00 00 83 f8 06 72 77 
83 f8 08 76 13 83 f8 0a 75 6d 41 f6 86 60 06 00 00 40 0f 84 dd 00 00 00 <41> f6 
84 24 45 02 00 00 08 4d 8d bd 00 01 00 00 74 3e 48 89 df 
  [  625.583300] RIP: intel_ddi_post_disable+0x54/0x170 [i915] RSP: 
ffff9dacc3f97a60
  [  625.583305] CR2: 0000000000000245
  [  625.583311] ---[ end trace 4825f4f3c3ccd1c6 ]---

  
  BIOS / embedded controller / Intel ME version as below

  Lenovo X280 model 20KFS05Q00
      BIOS 1.16 (N20ET31W)
      EC 1.05 (N20HT18W)
      ME 11.8.50.3460 (N20RG10W)
   
  ThinkPad USB-C Dock firmware 3.7
      BillBoard(BB) FW: 0.1.0.23
      USB Hub(HX3) FW: 1.14.7.183
      PD(CCG4 DK) FW: 1.3.40 
      DP Hub FW: 3.12.005

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