I've had this twice today. 
Lost data as a result of walking away for a cup of tea. Came back to a locked 
up desktop

May 12 11:18:04 mcp kernel: [drm:pipe_config_mismatch [i915]] *ERROR* mismatch 
in pixel_rate (expected 148500, found 296999)
May 12 11:18:04 mcp kernel: [drm:pipe_config_mismatch [i915]] *ERROR* mismatch 
in shared_dpll (expected 000000003724b6ad, found 000000003f64da57)
May 12 11:18:04 mcp kernel: [drm:pipe_config_mismatch [i915]] *ERROR* mismatch 
in base.adjusted_mode.crtc_clock (expected 148500, found 296999)
May 12 11:18:04 mcp kernel: [drm:pipe_config_mismatch [i915]] *ERROR* mismatch 
in port_clock (expected 270000, found 540000)
May 12 11:18:04 mcp kernel: ------------[ cut here ]------------
May 12 11:18:04 mcp kernel: pipe state doesn't match!
May 12 11:18:04 mcp kernel: WARNING: CPU: 0 PID: 8183 at 
drivers/gpu/drm/i915/display/intel_display.c:13158 
verify_crtc_state+0x2ad/0x300 [i915]
May 12 11:18:04 mcp kernel: Modules linked in: hidp rfcomm xt_comment dummy ccm 
xt_CHECKSUM xt_MASQUERADE xt_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp 
ip6table_mangle ip6table_nat iptable_mangle iptable_nat nf_nat nf_conntrack 
nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c nf_tables nfnetlink ip6table_filter 
ip6_tables iptable_filter bpfilter bridge stp llc cmac algif_hash 
algif_skcipher af_alg bnep binfmt_misc nls_iso8859_1 intel_rapl_msr mei_hdcp 
intel_rapl_common x86_pkg_temp_thermal intel_powerclamp coretemp 
crct10dif_pclmul ghash_clmulni_intel snd_usb_audio snd_usbmidi_lib gspca_vc032x 
gspca_main uvcvideo videobuf2_vmalloc snd_hda_codec_realtek usblp 
snd_hda_codec_generic videobuf2_memops videobuf2_v4l2 snd_hda_codec_hdmi 
videobuf2_common videodev snd_hda_intel snd_intel_dspcfg mc snd_hda_codec btusb 
snd_hda_core btrtl aesni_intel btbcm snd_hwdep crypto_simd btintel cryptd 
bluetooth glue_helper intel_cstate thinkpad_acpi intel_rapl_perf nvram 
ledtrig_audio ecdh_generic ecc snd_pcm snd_seq_midi
May 12 11:18:04 mcp kernel:  snd_seq_midi_event iwlmvm snd_rawmidi mac80211 
libarc4 iwlwifi snd_seq wmi_bmof input_leds joydev snd_seq_device snd_timer 
serio_raw cfg80211 intel_pch_thermal rtsx_pci_ms memstick mei_me snd mei 
soundcore mac_hid sch_fq_codel kvm_intel kvm parport_pc ppdev lp parport 
ip_tables x_tables autofs4 zfs(PO) zunicode(PO) zavl(PO) icp(PO) zcommon(PO) 
znvpair(PO) spl(O) zlua(PO) hid_generic usbhid hid rtsx_pci_sdmmc i915 
i2c_algo_bit crc32_pclmul drm_kms_helper syscopyarea sysfillrect sysimgblt 
fb_sys_fops psmouse i2c_i801 ahci libahci e1000e drm rtsx_pci lpc_ich wmi video
May 12 11:18:04 mcp kernel: CPU: 0 PID: 8183 Comm: Xorg Tainted: P           O  
    5.4.0-30-generic #34-Ubuntu
May 12 11:18:04 mcp kernel: Hardware name: LENOVO 20BV001BUK/20BV001BUK, BIOS 
JBET73WW (1.37 ) 08/14/2019
May 12 11:18:04 mcp kernel: RIP: 0010:verify_crtc_state+0x2ad/0x300 [i915]
May 12 11:18:04 mcp kernel: Code: b6 45 bf e9 8d fe ff ff 80 3d 85 76 10 00 00 
0f b6 f0 48 c7 c7 40 aa 52 c0 75 32 e8 5d e7 de ff e9 1e fe ff ff e8 ae 9d 24 
e5 <0f> 0b e9 1b ff ff ff e8 a2 9d 24 e5 0f 0b e9 85 fe ff ff e8 96 9d
May 12 11:18:04 mcp kernel: RSP: 0018:ffffb1e543f67a80 EFLAGS: 00010282
May 12 11:18:04 mcp kernel: RAX: 0000000000000000 RBX: ffff8db0a7d202b0 RCX: 
0000000000000006
May 12 11:18:04 mcp kernel: RDX: 0000000000000007 RSI: 0000000000000092 RDI: 
ffff8db0bda178c0
May 12 11:18:04 mcp kernel: RBP: ffffb1e543f67ac8 R08: 0000000000000530 R09: 
0000000000000004
May 12 11:18:04 mcp kernel: R10: 0000000000000000 R11: 0000000000000001 R12: 
ffff8db0b98f3800
May 12 11:18:04 mcp kernel: R13: ffff8db0a7d202b8 R14: ffff8db0a7d20000 R15: 
ffff8dad521aa000
May 12 11:18:04 mcp kernel: FS:  00007f98402dda80(0000) 
GS:ffff8db0bda00000(0000) knlGS:0000000000000000
May 12 11:18:04 mcp kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
May 12 11:18:04 mcp kernel: CR2: 00007f33c8ee0024 CR3: 000000075ffda006 CR4: 
00000000003606f0
May 12 11:18:04 mcp kernel: DR0: 0000000000000000 DR1: 0000000000000000 DR2: 
0000000000000000
May 12 11:18:04 mcp kernel: DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 
0000000000000400
May 12 11:18:04 mcp kernel: Call Trace:
May 12 11:18:04 mcp kernel:  intel_atomic_commit_tail+0xa43/0x12e0 [i915]
May 12 11:18:04 mcp kernel:  ? flush_workqueue_prep_pwqs+0x12e/0x140
May 12 11:18:04 mcp kernel:  ? flush_workqueue+0x193/0x420
May 12 11:18:04 mcp kernel:  ? intel_atomic_commit_ready+0x4d/0x54 [i915]
May 12 11:18:04 mcp kernel:  intel_atomic_commit+0x284/0x2b0 [i915]
May 12 11:18:04 mcp kernel:  drm_atomic_commit+0x4a/0x50 [drm]
May 12 11:18:04 mcp kernel:  drm_atomic_connector_commit_dpms+0xdf/0x100 [drm]
May 12 11:18:04 mcp kernel:  drm_mode_obj_set_property_ioctl+0x156/0x2a0 [drm]
May 12 11:18:04 mcp kernel:  ? drm_connector_set_obj_prop+0x90/0x90 [drm]
May 12 11:18:04 mcp kernel:  drm_connector_property_set_ioctl+0x3b/0x60 [drm]
May 12 11:18:04 mcp kernel:  drm_ioctl_kernel+0xae/0xf0 [drm]
May 12 11:18:04 mcp kernel:  drm_ioctl+0x234/0x3d0 [drm]
May 12 11:18:04 mcp kernel:  ? drm_connector_set_obj_prop+0x90/0x90 [drm]
May 12 11:18:04 mcp kernel:  ? __set_task_blocked+0x38/0xa0
May 12 11:18:04 mcp kernel:  ? __fpu__restore_sig+0x4a7/0x600
May 12 11:18:04 mcp kernel:  do_vfs_ioctl+0x407/0x670
May 12 11:18:04 mcp kernel:  ? recalc_sigpending+0x1c/0x60
May 12 11:18:04 mcp kernel:  ? _copy_from_user+0x3e/0x60
May 12 11:18:04 mcp kernel:  ksys_ioctl+0x67/0x90
May 12 11:18:04 mcp kernel:  __x64_sys_ioctl+0x1a/0x20
May 12 11:18:04 mcp kernel:  do_syscall_64+0x57/0x190
May 12 11:18:04 mcp kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
May 12 11:18:04 mcp kernel: RIP: 0033:0x7f984063d37b
May 12 11:18:04 mcp kernel: Code: 0f 1e fa 48 8b 05 15 3b 0d 00 64 c7 00 26 00 
00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 
05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e5 3a 0d 00 f7 d8 64 89 01 48
May 12 11:18:04 mcp kernel: RSP: 002b:00007ffcf2d6d9b8 EFLAGS: 00000246 
ORIG_RAX: 0000000000000010
May 12 11:18:04 mcp kernel: RAX: ffffffffffffffda RBX: 00007ffcf2d6d9f0 RCX: 
00007f984063d37b
May 12 11:18:04 mcp kernel: RDX: 00007ffcf2d6d9f0 RSI: 00000000c01064ab RDI: 
000000000000000c
May 12 11:18:04 mcp kernel: RBP: 00000000c01064ab R08: 000055efb1e263d0 R09: 
0000000000000000
May 12 11:18:04 mcp kernel: R10: 000055efb1e263d0 R11: 0000000000000246 R12: 
000055efb1feaea0
May 12 11:18:04 mcp kernel: R13: 000000000000000c R14: 0000000000000000 R15: 
000055efb176e980
May 12 11:18:04 mcp kernel: ---[ end trace 950ad17c90adf9c0 ]---

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https://bugs.launchpad.net/bugs/1871687

Title:
  System hard locks up intermittently

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  My T450 main laptop is generally left on all day and night. I
  sometimes suspend it when moving around the house, but it's often left
  on all the time. Sometimes when I go to start work in the morning
  there's some corruption on screen and the laptop won't respond. I
  can't REISUB or ssh in.

  This has happened a few times since clean installing 20.04. Previously
  I was on an upgraded-to-20.04 install and don't recall it happening
  there. The other obvious difference is I'm now running ZFS which I
  wasn't before. :S

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: linux-image-5.4.0-21-generic 5.4.0-21.25
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.11-0ubuntu24
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC3:  alan       8365 F.... pulseaudio
   /dev/snd/controlC2:  alan       8365 F.... pulseaudio
   /dev/snd/controlC1:  alan       8365 F.... pulseaudio
   /dev/snd/controlC0:  alan       8365 F.... pulseaudio
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Apr  8 19:30:46 2020
  InstallationDate: Installed on 2020-03-01 (38 days ago)
  InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Alpha amd64 (20200301)
  MachineType: LENOVO 20BV001BUK
  ProcFB: 0 i915drmfb
  ProcKernelCmdLine: BOOT_IMAGE=/BOOT/ubuntu_pyyy5h@/vmlinuz-5.4.0-21-generic 
root=ZFS=rpool/ROOT/ubuntu_pyyy5h ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-5.4.0-21-generic N/A
   linux-backports-modules-5.4.0-21-generic  N/A
   linux-firmware                            1.187
  SourcePackage: linux
  StagingDrivers: exfat
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/14/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET73WW (1.37 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BV001BUK
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98417 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: 
dmi:bvnLENOVO:bvrJBET73WW(1.37):bd08/14/2019:svnLENOVO:pn20BV001BUK:pvrThinkPadT450:rvnLENOVO:rn20BV001BUK:rvr0B98417WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.family: ThinkPad T450
  dmi.product.name: 20BV001BUK
  dmi.product.sku: LENOVO_MT_20BV_BU_Think_FM_ThinkPad T450
  dmi.product.version: ThinkPad T450
  dmi.sys.vendor: LENOVO

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