``` Jan 30 13:50:19 44 kernel: [ 10.874023] BUG: unable to handle kernel NULL pointer dereference at 0000000000000245 Jan 30 13:50:19 44 kernel: [ 10.874051] IP: intel_ddi_post_disable+0x54/0x170 [i915] Jan 30 13:50:19 44 kernel: [ 10.874052] PGD 0 P4D 0 Jan 30 13:50:19 44 kernel: [ 10.874055] Oops: 0000 [#1] SMP PTI Jan 30 13:50:19 44 kernel: [ 10.874057] Modules linked in: cmac bnep snd_hda_codec_hdmi binfmt_misc nls_iso8859_1 intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm irqbypass crct10dif_pclmul arc4 snd_hda_codec_realtek snd_hda_codec_generic iwlmvm snd_hda_intel uvcvideo crc32_pclmul snd_hda_codec wmi_bmof ghash_clmulni_intel mac80211 iwlwifi pcbc videobuf2_vmalloc snd_hda_core videobuf2_memops videobuf2_v4l2 aesni_intel videobuf2_core snd_hwdep aes_x86_64 snd_pcm crypto_simd videodev glue_helper thinkpad_acpi cryptd media nvram intel_cstate cfg80211 snd_seq_midi intel_rapl_perf snd_seq_midi_event btusb rtsx_pci_ms joydev snd_rawmidi btrtl memstick input_leds serio_raw btbcm snd_seq btintel bluetooth snd_seq_device ecdh_generic snd_timer snd mei_me mei soundcore mac_hid shpchp intel_pch_thermal wmi sch_fq_codel Jan 30 13:50:19 44 kernel: [ 10.874091] parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_lenovo hid_generic usbhid hid rtsx_pci_sdmmc i915 i2c_algo_bit drm_kms_helper syscopyarea sysfillrect sysimgblt e1000e fb_sys_fops psmouse ptp drm i2c_i801 pps_core ahci rtsx_pci libahci video Jan 30 13:50:19 44 kernel: [ 10.874106] CPU: 3 PID: 1783 Comm: Xorg Not tainted 4.15.0-44-generic #47-Ubuntu Jan 30 13:50:19 44 kernel: [ 10.874107] Hardware name: LENOVO 20FWCTO1WW/20FWCTO1WW, BIOS R07ET87W (2.27 ) 09/27/2018 Jan 30 13:50:19 44 kernel: [ 10.874125] RIP: 0010:intel_ddi_post_disable+0x54/0x170 [i915] Jan 30 13:50:19 44 kernel: [ 10.874127] RSP: 0018:ffffadb80877b9f0 EFLAGS: 00010297 Jan 30 13:50:19 44 kernel: [ 10.874128] RAX: 0000000000000007 RBX: ffff8941d1017000 RCX: ffffffffc0338272 Jan 30 13:50:19 44 kernel: [ 10.874130] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8941d1017000 Jan 30 13:50:19 44 kernel: [ 10.874131] RBP: ffffadb80877ba20 R08: 0000000000000004 R09: 0000000000000000 Jan 30 13:50:19 44 kernel: [ 10.874132] R10: 0000000000000117 R11: 000000000000008c R12: 0000000000000000 Jan 30 13:50:19 44 kernel: [ 10.874133] R13: ffff8941d1017000 R14: ffff8941d0620000 R15: ffff8941d05dd800 Jan 30 13:50:19 44 kernel: [ 10.874135] FS: 00007f7c55281600(0000) GS:ffff8942014c0000(0000) knlGS:0000000000000000 Jan 30 13:50:19 44 kernel: [ 10.874136] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jan 30 13:50:19 44 kernel: [ 10.874138] CR2: 0000000000000245 CR3: 00000007e8dc2006 CR4: 00000000003606e0 Jan 30 13:50:19 44 kernel: [ 10.874139] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 Jan 30 13:50:19 44 kernel: [ 10.874140] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Jan 30 13:50:19 44 kernel: [ 10.874141] Call Trace: Jan 30 13:50:19 44 kernel: [ 10.874159] ? intel_dp_sink_dpms+0xbb/0xf0 [i915] Jan 30 13:50:19 44 kernel: [ 10.874175] intel_mst_post_disable_dp+0x99/0xd0 [i915] Jan 30 13:50:19 44 kernel: [ 10.874192] intel_encoders_post_disable.isra.102+0x66/0x80 [i915] Jan 30 13:50:19 44 kernel: [ 10.874207] haswell_crtc_disable+0xe8/0x150 [i915] Jan 30 13:50:19 44 kernel: [ 10.874223] intel_atomic_commit_tail+0x7ea/0xd30 [i915] Jan 30 13:50:19 44 kernel: [ 10.874238] intel_atomic_commit+0x277/0x2b0 [i915] Jan 30 13:50:19 44 kernel: [ 10.874249] drm_atomic_commit+0x51/0x60 [drm] Jan 30 13:50:19 44 kernel: [ 10.874255] drm_atomic_helper_set_config+0x7c/0x90 [drm_kms_helper] Jan 30 13:50:19 44 kernel: [ 10.874263] __drm_mode_set_config_internal+0x6b/0x120 [drm] Jan 30 13:50:19 44 kernel: [ 10.874270] drm_mode_setcrtc+0x47f/0x660 [drm] Jan 30 13:50:19 44 kernel: [ 10.874277] ? drm_mode_getcrtc+0x190/0x190 [drm] Jan 30 13:50:19 44 kernel: [ 10.874284] drm_ioctl_kernel+0x5f/0xb0 [drm] Jan 30 13:50:19 44 kernel: [ 10.874290] drm_ioctl+0x31b/0x3d0 [drm] Jan 30 13:50:19 44 kernel: [ 10.874296] ? drm_mode_getcrtc+0x190/0x190 [drm] Jan 30 13:50:19 44 kernel: [ 10.874300] do_vfs_ioctl+0xa8/0x630 Jan 30 13:50:19 44 kernel: [ 10.874302] ? handle_mm_fault+0xb1/0x1f0 Jan 30 13:50:19 44 kernel: [ 10.874305] ? __do_page_fault+0x270/0x4d0 Jan 30 13:50:19 44 kernel: [ 10.874308] ? SyS_futex+0x13b/0x180 Jan 30 13:50:19 44 kernel: [ 10.874310] SyS_ioctl+0x79/0x90 Jan 30 13:50:19 44 kernel: [ 10.874312] do_syscall_64+0x73/0x130 Jan 30 13:50:19 44 kernel: [ 10.874315] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 Jan 30 13:50:19 44 kernel: [ 10.874317] RIP: 0033:0x7f7c526865d7 Jan 30 13:50:19 44 kernel: [ 10.874318] RSP: 002b:00007ffee74ef6f8 EFLAGS: 00003246 ORIG_RAX: 0000000000000010 Jan 30 13:50:19 44 kernel: [ 10.874320] RAX: ffffffffffffffda RBX: 00007ffee74ef730 RCX: 00007f7c526865d7 Jan 30 13:50:19 44 kernel: [ 10.874322] RDX: 00007ffee74ef730 RSI: 00000000c06864a2 RDI: 000000000000000e Jan 30 13:50:19 44 kernel: [ 10.874323] RBP: 00007ffee74ef730 R08: 0000000000000000 R09: 00005576e0d82320 Jan 30 13:50:19 44 kernel: [ 10.874324] R10: 00007ffee74ef8b0 R11: 0000000000003246 R12: 00000000c06864a2 Jan 30 13:50:19 44 kernel: [ 10.874325] R13: 000000000000000e R14: 00005576e02c2b30 R15: 00005576e013c1b0 Jan 30 13:50:19 44 kernel: [ 10.874327] 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 Jan 30 13:50:19 44 kernel: [ 10.874369] RIP: intel_ddi_post_disable+0x54/0x170 [i915] RSP: ffffadb80877b9f0 Jan 30 13:50:19 44 kernel: [ 10.874370] CR2: 0000000000000245 Jan 30 13:50:19 44 kernel: [ 10.874371] ---[ end trace 9f59be814b097d58 ]---