Desktop freeze and corruption after playing Steam game

Steps for reproducing this issue:

   - Open Steam launching Age Of Empires 2 Definitive edition with discrete graphics card
   - Play Game
   - Observe some stuttering in game, then close the game
   - Steam locks up and after a short time the whole desktop hangs and becomes unresponsive (mouse pointer still moves, keyboard doesn't work, for example alt+shift+fN)
   - In the meanwhile, the mouse cursor and some regions of the Steam window become corrupted
   - System must be rebooted with sysrq REISUB

Excerpt 1 from syslog:

Mar 23 23:27:31 dario-Aspire-E5-553G kernel: [ 2784.630726] GpuWatchdog[14120]: segfault at 0 ip 00007f286c6e9bdd sp 00007f28613984d0 error 6 in libcef.so[7f2868963000+69a4000]
Mar 23 23:27:31 dario-Aspire-E5-553G kernel: [ 2784.630742] Code: 00 79 09 48 8b 7d a0 e8 61 80 c1 02 41 8b 85 00 01 00 00 85 c0 0f 84 ab 00 00 00 49 8b 45 00 4c 89 ef be 01 00 00 00 ff 50 58 <c7> 04 25 00 00 00 00 37 13 00 00 c6 05 01 a6 37 03 01 80 bd 7f ff
Mar 23 23:27:31 dario-Aspire-E5-553G kernel: [ 2784.937600] [drm] Fence fallback timer expired on ring sdma0
Mar 23 23:27:32 dario-Aspire-E5-553G kernel: [ 2785.449452] [drm] Fence fallback timer expired on ring sdma1
Mar 23 23:27:32 dario-Aspire-E5-553G kernel: [ 2785.449466] [drm] Fence fallback timer expired on ring sdma0

Excerpt 2 from syslog:

Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070479] INFO: task steamwe:disk$2:34435 blocked for more than 120 seconds.
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070487] Tainted: G W 5.8.0-45-generic #51~20.04.1-Ubuntu
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070489] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070492] steamwe:disk$2 D 0 34435 14104 0x80004002
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070497] Call Trace:
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070510] __schedule+0x394/0xa60
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070516] ? common_interrupt+0x87/0x150
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070519] schedule+0x55/0xc0
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070522] schedule_timeout+0x111/0x160
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070527] wait_for_completion+0x94/0x100
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070538] drm_sched_entity_fini+0x4a/0x1e0 [gpu_sched]
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070544] drm_sched_entity_destroy+0x20/0x30 [gpu_sched]
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070778] amdgpu_vm_fini+0x243/0x400 [amdgpu]
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070958] amdgpu_driver_postclose_kms+0x165/0x230 [amdgpu]
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.070964] ? idr_destroy+0x79/0xc0
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071015] drm_file_free.part.0+0x1f6/0x270 [drm]
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071043] drm_close_helper.isra.0+0x65/0x70 [drm]
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071071] drm_release+0x6e/0xf0 [drm]
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071076] __fput+0xe9/0x250
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071080] ____fput+0xe/0x10
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071084] task_work_run+0x70/0xb0
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071087] do_exit+0x373/0xb30
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071091] do_group_exit+0x43/0xa0
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071094] get_signal+0x17d/0x8f0
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071100] do_signal+0x34/0x280
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071105] __prepare_exit_to_usermode+0x155/0x210
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071109] __syscall_return_slowpath+0x31/0x160
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071114] do_syscall_64+0x56/0xc0
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071118] entry_SYSCALL_64_after_hwframe+0x44/0xa9
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071122] RIP: 0033:0x7f95d692b376
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071125] RSP: 002b:00007f95bf19e6d0 EFLAGS: 00000282 ORIG_RAX: 00000000000000ca
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071128] RAX: fffffffffffffe00 RBX: 0000000000000000 RCX: 00007f95d692b376
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071130] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00003335572d20c8
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071131] RBP: 00003335572d20a0 R08: 0000000000000000 R09: 0000000000000000
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071133] R10: 0000000000000000 R11: 0000000000000282 R12: 00003335572d20c4
Mar 23 23:51:37 dario-Aspire-E5-553G kernel: [ 4230.071134] R13: 00003335572d2078 R14: 00007f95bf19e710 R15: 00003335572d20c8

In attachment the full syslog during the gaming session until reboot.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xserver-xorg-video-amdgpu 19.1.0-1
ProcVersionSignature: Ubuntu 5.8.0-48.54~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-48-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
BootLog: Error: [Errno 13] Permesso negato: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Wed Mar 24 22:22:30 2021
DistUpgraded: 2020-05-18 00:23:17,733 DEBUG Running PostInstallScript: './xorg_fix_proprietary.py'
DistroCodename: focal
DistroVariant: ubuntu
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Wani [Radeon R5/R6/R7 Graphics] [1002:9874] (rev c9) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] Wani [Radeon R5/R6/R7 Graphics] [1025:1108]
   Subsystem: Acer Incorporated [ALI] Topaz XT [Radeon R7 M260/M265 / M340/M360 / M440/M445 / 530/535 / 620/625 Mobile] [1025:1108]
InstallationDate: Installed on 2020-02-01 (417 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
MachineType: Acer Aspire E5-553G
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-48-generic root=UUID=ab7510f9-4c69-4ce1-a692-a867c31be554 ro quiet splash vt.handoff=7
SourcePackage: xserver-xorg-video-amdgpu
UpgradeStatus: Upgraded to focal on 2020-05-17 (310 days ago)
dmi.bios.date: 03/28/2018
dmi.bios.release: 0.0
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.31
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Wasp_BR
dmi.board.vendor: Acer
dmi.board.version: V1.31
dmi.chassis.type: 10
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.ec.firmware.release: 2.10
dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.31:bd03/28/2018:br0.0:efr2.10:svnAcer:pnAspireE5-553G:pvrV1.31:rvnAcer:rnWasp_BR:rvrV1.31:cvnChassisManufacturer:ct10:cvrChassisVersion:
dmi.product.family: BR
dmi.product.name: Aspire E5-553G
dmi.product.sku: Aspire E5-553G_109F_1.31
dmi.product.version: V1.31
dmi.sys.vendor: Acer
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.102-1ubuntu1~20.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.2~20.04.1
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