Same problem here. Reproducable by switching virtual terminals a few times with 
<ctrl><alt><F#>.
The only thing the system responds to is a ping (but no ssh) and a 
<sysrq>REISUB.
This only happens to me on kernel 5.4.0-56-generic. If I revert to the previous 
kernel, 5.4.0-54-generic, the freeze does not happen.

After every freeze journalctl always shows a SIMD error that seems to cause the 
freeze.
Below are two examples:

dec 03 17:23:05 zen kernel: simd exception: 0000 [#1] SMP NOPTI
dec 03 17:23:05 zen kernel: CPU: 5 PID: 1195 Comm: Xorg Tainted: G           OE 
    5.4.0-56-generic #62-Ubuntu
dec 03 17:23:05 zen kernel: Hardware name: Micro-Star International Co., Ltd. 
MS-7C52/B450M-A PRO MAX (MS-7C52), BIOS 3.40 01/22/2020
dec 03 17:23:05 zen kernel: RIP: 
0010:CalculateDelayAfterScaler.constprop.0+0xb2/0x320 [amdgpu]
dec 03 17:23:05 zen kernel: Code: 10 45 b0 f2 45 0f 59 84 24 08 0d 00 00 f2 44 
0f 5e 45 d0 f2 48 0f 2a c8 f2 0f 59 c8 66 0f ef c0 f2 41 0f 5a 84 24 60 17 00 
00 <f2> 41 0f 5e c8 f2 0f 5c 4d c8 f2 0f 5a c9 e8 7b df f7 ff f2 0f 10
dec 03 17:23:05 zen kernel: RSP: 0018:ffffa135419cf708 EFLAGS: 00010202
dec 03 17:23:05 zen kernel: RAX: 0000000000003c00 RBX: 0000000000000002 RCX: 
0000000000000000
dec 03 17:23:05 zen kernel: RDX: 0000000000000001 RSI: 0000000000000000 RDI: 
ffff8e2cb16c1f38
dec 03 17:23:05 zen kernel: RBP: ffffa135419cf780 R08: 0000000000000002 R09: 
0000000000000f00
dec 03 17:23:05 zen kernel: R10: 0000000000000001 R11: ffff8e2cb16c53b8 R12: 
ffff8e2cb16c1f38
dec 03 17:23:05 zen kernel: R13: 0000000000000000 R14: 0000000000000000 R15: 
0000000000000001
dec 03 17:23:05 zen kernel: FS:  00007f43ee050a80(0000) 
GS:ffff8e2d6e940000(0000) knlGS:0000000000000000
dec 03 17:23:05 zen kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
dec 03 17:23:05 zen kernel: CR2: 00007fc926c8b3e0 CR3: 00000007e6050000 CR4: 
0000000000340ee0
dec 03 17:23:05 zen kernel: Call Trace:

and

dec 04 06:53:51 zen kernel: simd exception: 0000 [#1] SMP NOPTI
dec 04 06:53:51 zen kernel: CPU: 0 PID: 5889 Comm: kworker/0:2 Tainted: G       
    OE     5.4.0-56-generic #62-Ubuntu
dec 04 06:53:51 zen kernel: Hardware name: Micro-Star International Co., Ltd. 
MS-7C52/B450M-A PRO MAX (MS-7C52), BIOS 3.40 01/22/2020
dec 04 06:53:51 zen kernel: Workqueue: events console_callback
dec 04 06:53:51 zen kernel: RIP: 
0010:CalculateDelayAfterScaler.constprop.0+0xb2/0x320 [amdgpu]
dec 04 06:53:51 zen kernel: Code: 10 45 b0 f2 45 0f 59 84 24 08 0d 00 00 f2 44 
0f 5e 45 d0 f2 48 0f 2a c8 f2 0f 59 c8 66 0f ef c0 f2 41 0f 5a 84 24 60 17 00 
00 <f2> 41 0f 5e c8 f2 0f 5c 4d c8 f2 0f 5a c9 e8 7b df f7 ff f2 0f 10
dec 04 06:53:51 zen kernel: RSP: 0018:ffffad2c42a77618 EFLAGS: 00010202
dec 04 06:53:51 zen kernel: RAX: 0000000000000f00 RBX: 0000000000000002 RCX: 
0000000000000000
dec 04 06:53:51 zen kernel: RDX: 0000000000000001 RSI: 0000000000000000 RDI: 
ffff9e845b851f38
dec 04 06:53:51 zen kernel: RBP: ffffad2c42a77690 R08: 0000000000000002 R09: 
0000000000000f00
dec 04 06:53:51 zen kernel: R10: 0000000000000001 R11: ffff9e845b8553b8 R12: 
ffff9e845b851f38
dec 04 06:53:51 zen kernel: R13: 0000000000000000 R14: 0000000000000000 R15: 
0000000000000001
dec 04 06:53:51 zen kernel: FS:  0000000000000000(0000) 
GS:ffff9e852e800000(0000) knlGS:0000000000000000
dec 04 06:53:51 zen kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
dec 04 06:53:51 zen kernel: CR2: 000055d78231afd0 CR3: 0000000724648000 CR4: 
0000000000340ef0
dec 04 06:53:51 zen kernel: Call Trace:
dec 04 06:53:51 zen kernel:  
dml20v2_ModeSupportAndSystemConfigurationFull+0x403f/0x5d60 [amdgpu]
dec 04 06:53:51 zen kernel:  dml_get_voltage_level+0x127/0x200 [amdgpu]
dec 04 06:53:51 zen kernel:  dcn20_fast_validate_bw+0x376/0xaf0 [amdgpu]
dec 04 06:53:51 zen kernel:  dcn20_validate_bandwidth_internal+0xaf/0x290 
[amdgpu]
dec 04 06:53:51 zen kernel:  ? resource_build_scaling_params+0x709/0x9c0 
[amdgpu]
dec 04 06:53:51 zen kernel:  dcn20_validate_bandwidth+0x31/0x100 [amdgpu]
dec 04 06:53:51 zen kernel:  dc_validate_global_state+0x260/0x2d0 [amdgpu]
dec 04 06:53:51 zen kernel:  ? drm_modeset_lock_all_ctx+0xd9/0xe0 [drm]
dec 04 06:53:51 zen kernel:  amdgpu_dm_atomic_check+0x60c/0x860 [amdgpu]
dec 04 06:53:51 zen kernel:  drm_atomic_check_only+0x2b1/0x450 [drm]
dec 04 06:53:51 zen kernel:  drm_atomic_commit+0x18/0x50 [drm]
dec 04 06:53:51 zen kernel:  drm_client_modeset_commit_atomic+0x1d0/0x1f0 [drm]
dec 04 06:53:51 zen kernel:  drm_client_modeset_commit_force+0x55/0x160 [drm]
dec 04 06:53:51 zen kernel:  drm_fb_helper_pan_display+0xcf/0x230 
[drm_kms_helper]
dec 04 06:53:51 zen kernel:  fb_pan_display+0x8c/0x110
dec 04 06:53:51 zen kernel:  bit_update_start+0x20/0x50
dec 04 06:53:51 zen kernel:  fbcon_switch+0x380/0x550
dec 04 06:53:51 zen kernel:  redraw_screen+0xfe/0x270
dec 04 06:53:51 zen kernel:  complete_change_console+0x3f/0xe0
dec 04 06:53:51 zen kernel:  change_console+0x55/0x90
dec 04 06:53:51 zen kernel:  console_callback+0x178/0x190
dec 04 06:53:51 zen kernel:  ? pwq_dec_nr_in_flight+0x4e/0xa0
dec 04 06:53:51 zen kernel:  process_one_work+0x1eb/0x3b0
dec 04 06:53:51 zen kernel:  worker_thread+0x4d/0x400
dec 04 06:53:51 zen kernel:  kthread+0x104/0x140
dec 04 06:53:51 zen kernel:  ? process_one_work+0x3b0/0x3b0
dec 04 06:53:51 zen kernel:  ? kthread_park+0x90/0x90
dec 04 06:53:51 zen kernel:  ret_from_fork+0x22/0x40
dec 04 06:53:51 zen kernel: Modules linked in: dm_crypt vboxnetadp(OE) 
vboxnetflt(OE) vboxdrv(OE) xt_recent xt_CHECKSUM xt_MASQUERADE ip6table_mangle 
ip6table_nat iptable_mangle iptable_nat nf_nat nf_tables nfnetlink bridge stp 
llc snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio 
snd_hda_codec_hdmi snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core 
snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi amdgpu joydev 
input_leds snd_seq edac_mce_amd amd_iommu_v2 snd_seq_device kvm_amd snd_timer 
gpu_sched crct10dif_pclmul ghash_clmulni_intel nls_iso8859_1 snd ttm 
drm_kms_helper aesni_intel crypto_simd i2c_algo_bit cryptd fb_sys_fops 
glue_helper syscopyarea sysfillrect soundcore wmi_bmof sysimgblt ccp k10temp 
mac_hid nf_log_ipv6 ip6t_REJECT nf_reject_ipv6 xt_hl ip6t_rt nf_log_ipv4 
nf_log_common ipt_REJECT nf_reject_ipv4 xt_LOG xt_limit xt_addrtype 
sch_fq_codel xt_tcpudp xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 
ip6table_filter ip6_tables iptable_filter bpfilter kvm nct6775
dec 04 06:53:51 zen kernel:  hwmon_vid parport_pc ppdev lp parport drm nfsd 
auth_rpcgss nfs_acl lockd grace sunrpc ip_tables x_tables autofs4 btrfs xor 
zstd_compress raid6_pq libcrc32c hid_generic usbhid hid uas usb_storage 
crc32_pclmul i2c_piix4 r8169 ahci realtek nvme libahci nvme_core wmi gpio_amdpt 
gpio_generic
dec 04 06:53:51 zen kernel: ---[ end trace 140e97c87a208340 ]---
dec 04 06:53:51 zen kernel: RIP: 
0010:CalculateDelayAfterScaler.constprop.0+0xb2/0x320 [amdgpu]
dec 04 06:53:51 zen kernel: Code: 10 45 b0 f2 45 0f 59 84 24 08 0d 00 00 f2 44 
0f 5e 45 d0 f2 48 0f 2a c8 f2 0f 59 c8 66 0f ef c0 f2 41 0f 5a 84 24 60 17 00 
00 <f2> 41 0f 5e c8 f2 0f 5c 4d c8 f2 0f 5a c9 e8 7b df f7 ff f2 0f 10
dec 04 06:53:51 zen kernel: RSP: 0018:ffffad2c42a77618 EFLAGS: 00010202
dec 04 06:53:51 zen kernel: RAX: 0000000000000f00 RBX: 0000000000000002 RCX: 
0000000000000000
dec 04 06:53:51 zen kernel: RDX: 0000000000000001 RSI: 0000000000000000 RDI: 
ffff9e845b851f38
dec 04 06:53:51 zen kernel: RBP: ffffad2c42a77690 R08: 0000000000000002 R09: 
0000000000000f00
dec 04 06:53:51 zen kernel: R10: 0000000000000001 R11: ffff9e845b8553b8 R12: 
ffff9e845b851f38
dec 04 06:53:51 zen kernel: R13: 0000000000000000 R14: 0000000000000000 R15: 
0000000000000001
dec 04 06:53:51 zen kernel: FS:  0000000000000000(0000) 
GS:ffff9e852e800000(0000) knlGS:0000000000000000
dec 04 06:53:51 zen kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
dec 04 06:53:51 zen kernel: CR2: 000055d78231afd0 CR3: 0000000724648000 CR4: 
0000000000340ef0
dec 04 06:54:16 zen kernel: usb 1-2: USB disconnect, device number 2
dec 04 06:54:16 zen kernel: usb 1-2.3: USB disconnect, device number 3
dec 04 06:54:16 zen kernel: usb 1-2.4: USB disconnect, device number 4
dec 04 06:54:16 zen acpid[859]: input device has been disconnected, fd 14

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to nvidia-graphics-drivers-440 in Ubuntu.
https://bugs.launchpad.net/bugs/1906449

Title:
  [nvidia] [amdgpu] Xorg randomly freezes

Status in nvidia-graphics-drivers-440 package in Ubuntu:
  New
Status in xfce4 package in Ubuntu:
  New
Status in xorg-server package in Ubuntu:
  New
Status in xserver-xorg-video-amdgpu package in Ubuntu:
  New

Bug description:
  Initially, I thought it only happened during file transfers (because
  that's when it happens most often), but I later found that it can
  happen at any time, because I just turned my computer on, went to go
  make a coffee, have a cigarette, and when I came back, the entire
  screen, desktop, system, etc had frozen again. I always need to hold
  the power button down to do an emergency restart, because I can't even
  use Alt+F# to get into the TTY.

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-56.62-generic 5.4.73
  Uname: Linux 5.4.0-56-generic x86_64
  NonfreeKernelModules: nvidia_modeset nvidia
  .proc.driver.nvidia.gpus.0000.01.00.0: Error: [Errno 21] Is a directory: 
'/proc/driver/nvidia/gpus/0000:01:00.0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.suspend: suspend hibernate resume
  .proc.driver.nvidia.suspend_depth: default modeset uvm
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  440.95.01  Thu May 28 
07:03:08 UTC 2020
   GCC version:  gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)
  ApportVersion: 2.20.11-0ubuntu27.13
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: None
  CurrentDesktop: XFCE
  Date: Tue Dec  1 12:28:44 2020
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  DkmsStatus: nvidia, 440.95.01, 5.4.0-56-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Continuously
  GpuHangReproducibility: Seems to happen randomly
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard:
   NVIDIA Corporation TU106 [GeForce RTX 2060] [10de:1f15] (rev a1) (prog-if 00 
[VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:1e21]
   Advanced Micro Devices, Inc. [AMD/ATI] Renoir [1002:1636] (rev f0) (prog-if 
00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Renoir [1043:1e21]
  InstallationDate: Installed on 2020-12-01 (0 days ago)
  InstallationMedia: Xubuntu 20.04.1 LTS "Focal Fossa" - Release amd64 
(20200731)
  MachineType: ASUSTeK COMPUTER INC. TUF Gaming FA506IV_TUF506IV
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-56-generic 
root=UUID=11577769-570c-4297-a9b2-35fb3a30f6bf ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/02/2020
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: FA506IV.309
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: FA506IV
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No  Asset  Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrFA506IV.309:bd07/02/2020:svnASUSTeKCOMPUTERINC.:pnTUFGamingFA506IV_TUF506IV:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnFA506IV:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.family: TUF Gaming FA506IV
  dmi.product.name: TUF Gaming FA506IV_TUF506IV
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.
  nvidia-settings:
   ERROR: Unable to load info from any available system
   
   
   ERROR: Unable to load info from any available system
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.101-2
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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