This bug might be related:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813543

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https://bugs.launchpad.net/bugs/1813831

Title:
  Oops: NULL pointer dereference intel_ddi_post_disable+0x54/0x170

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I am running Ubuntu 18.04 LTS on a HP EliteBook 840 G5 with docking station 
and two screens attached via DisplayPort.
  Reproducibly, when I close the lid of my notebook, the kernel 
4.15.0-44.47-generic crashes with a Oops in i915 / intel_ddi_post_disable.
  The previous kernel 4.15.0-43.46-generic works without problems.

  Oops:

  [  224.498572] BUG: unable to handle kernel NULL pointer dereference at 
0000000000000245
  [  224.498658] IP: intel_ddi_post_disable+0x54/0x170 [i915]
  [  224.498663] PGD 0 P4D 0 
  [  224.498672] Oops: 0000 [#1] SMP PTI
  [  224.498677] Modules linked in: hid_logitech_hidpp hid_logitech_dj 
hid_cherry usbhid rfcomm nfnetlink xfrm_user xfrm_algo xt_addrtype overlay aufs 
wireguard(OE) ip6_udp_tunnel udp_tunnel thunderbolt 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 devlink ebtable_filter ebtables bnep 
nls_iso8859_1 hid_multitouch snd_soc_skl snd_soc_skl_ipc snd_hda_ext_core 
snd_soc_sst_dsp snd_soc_sst_ipc snd_soc_acpi snd_hda_codec_hdmi snd_soc_core 
snd_compress ac97_bus snd_hda_codec_conexant snd_hda_codec_generic 
snd_pcm_dmaengine arc4 snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep 
snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi iwlmvm mac80211 intel_rapl
  [  224.498761]  x86_pkg_temp_thermal intel_powerclamp coretemp iwlwifi 
kvm_intel snd_seq kvm irqbypass intel_cstate hp_wmi intel_rapl_perf cfg80211 
sparse_keymap intel_wmi_thunderbolt joydev input_leds snd_seq_device serio_raw 
wmi_bmof snd_timer snd soundcore uvcvideo videobuf2_vmalloc btusb 
videobuf2_memops btrtl videobuf2_v4l2 btbcm videobuf2_core btintel videodev 
media bluetooth ecdh_generic shpchp mei_me mei ucsi_acpi typec_ucsi idma64 
typec virt_dma intel_lpss_pci processor_thermal_device intel_pch_thermal 
intel_lpss intel_soc_dts_iosf int3403_thermal int340x_thermal_zone mac_hid 
int3400_thermal acpi_pad acpi_thermal_rel hp_wireless sch_fq_codel 
iptable_filter ip6table_filter ip6_tables br_netfilter bridge stp llc 
arp_tables parport_pc ppdev lp parport ip_tables x_tables autofs4 algif_skcipher
  [  224.498851]  af_alg dm_crypt crct10dif_pclmul crc32_pclmul 
ghash_clmulni_intel pcbc aesni_intel i915 aes_x86_64 crypto_simd glue_helper 
cryptd e1000e ptp i2c_algo_bit pps_core drm_kms_helper psmouse syscopyarea 
sysfillrect sysimgblt fb_sys_fops nvme nvme_core drm i2c_i801 i2c_hid wmi hid 
video pinctrl_sunrisepoint
  [  224.498895] CPU: 0 PID: 1952 Comm: Xorg Tainted: G           OE    
4.15.0-44-generic #47-Ubuntu
  [  224.498899] Hardware name: HP HP EliteBook 840 G5/83B2, BIOS Q78 Ver. 
01.04.00 09/12/2018
  [  224.498961] RIP: 0010:intel_ddi_post_disable+0x54/0x170 [i915]
  [  224.498966] RSP: 0018:ffffbf5cc45ab9f0 EFLAGS: 00010297
  [  224.498971] RAX: 0000000000000007 RBX: ffff9803af6ff000 RCX: 
ffffffffc0744272
  [  224.498974] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 
ffff9803af6ff000
  [  224.498978] RBP: ffffbf5cc45aba20 R08: 0000000000000003 R09: 
0000000000000000
  [  224.498982] R10: 0000000000000209 R11: 0000000000000170 R12: 
0000000000000000
  [  224.498985] R13: ffff9803af6ff000 R14: ffff9803aed90000 R15: 
ffff98031202d000
  [  224.498991] FS:  00007ff14e363600(0000) GS:ffff9803df400000(0000) 
knlGS:0000000000000000
  [  224.498995] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [  224.498999] CR2: 0000000000000245 CR3: 0000000830496006 CR4: 
00000000003606f0
  [  224.499002] Call Trace:
  [  224.499064]  ? intel_dp_sink_dpms+0xbb/0xf0 [i915]
  [  224.499118]  intel_mst_post_disable_dp+0x99/0xd0 [i915]
  [  224.499175]  intel_encoders_post_disable.isra.102+0x66/0x80 [i915]
  [  224.499226]  haswell_crtc_disable+0xe8/0x150 [i915]
  [  224.499280]  intel_atomic_commit_tail+0x7ea/0xd30 [i915]
  [  224.499330]  intel_atomic_commit+0x277/0x2b0 [i915]
  [  224.499367]  drm_atomic_commit+0x51/0x60 [drm]
  [  224.499387]  drm_atomic_helper_set_config+0x7c/0x90 [drm_kms_helper]
  [  224.499414]  __drm_mode_set_config_internal+0x6b/0x120 [drm]
  [  224.499440]  drm_mode_setcrtc+0x47f/0x660 [drm]
  [  224.499464]  ? drm_mode_getcrtc+0x190/0x190 [drm]
  [  224.499486]  drm_ioctl_kernel+0x5f/0xb0 [drm]
  [  224.499507]  drm_ioctl+0x31b/0x3d0 [drm]
  [  224.499528]  ? drm_mode_getcrtc+0x190/0x190 [drm]
  [  224.499540]  do_vfs_ioctl+0xa8/0x630
  [  224.499547]  ? recalc_sigpending+0x1b/0x50
  [  224.499556]  ? _copy_from_user+0x3e/0x60
  [  224.499563]  SyS_ioctl+0x79/0x90
  [  224.499571]  do_syscall_64+0x73/0x130
  [  224.499581]  entry_SYSCALL_64_after_hwframe+0x3d/0xa2
  [  224.499586] RIP: 0033:0x7ff14b7615d7
  [  224.499590] RSP: 002b:00007ffd03403428 EFLAGS: 00000246 ORIG_RAX: 
0000000000000010
  [  224.499596] RAX: ffffffffffffffda RBX: 00007ffd03403460 RCX: 
00007ff14b7615d7
  [  224.499599] RDX: 00007ffd03403460 RSI: 00000000c06864a2 RDI: 
000000000000000c
  [  224.499603] RBP: 00007ffd03403460 R08: 0000000000000000 R09: 
0000559e72a0d510
  [  224.499607] R10: 00007ffd034035e0 R11: 0000000000000246 R12: 
00000000c06864a2
  [  224.499611] R13: 000000000000000c R14: 0000559e71ea5a40 R15: 
0000559e71d25a20
  [  224.499615] 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 
  [  224.499752] RIP: intel_ddi_post_disable+0x54/0x170 [i915] RSP: 
ffffbf5cc45ab9f0
  [  224.499755] CR2: 0000000000000245
  [  224.499761] ---[ end trace f6caf79c13f5597d ]---

  $ lsb_release -rd
  Description:  Ubuntu 18.04.1 LTS
  Release:      18.04

  $ apt-cache policy linux-image-4.15.0-44-generic 
  linux-image-4.15.0-44-generic:
    Installed: 4.15.0-44.47
    Candidate: 4.15.0-44.47
    Version table:
   *** 4.15.0-44.47 500
          500 http://at.archive.ubuntu.com/ubuntu bionic-updates/main amd64 
Packages
          500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 
Packages
          100 /var/lib/dpkg/status

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