[Bug 1813831] Re: Oops: NULL pointer dereference intel_ddi_post_disable+0x54/0x170

*** This bug is a duplicate of bug 1813663 ***
https://bugs.launchpad.net/bugs/1813663

This bug is also related to
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813663
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1813745

This kernel works fine for me too:

> Please test this kernel:
> https://people.canonical.com/~khfeng/lp1813663/
>
> This commit is reverted in the test kernel:
> "drm/i915/dp: Send DPCD ON for MST before phy_up"

** This bug has been marked a duplicate of bug 1813663
External monitors does not work anymore 4.15.0-44

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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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