Hello dears - me too:

it is a ASUS with Ryzen and Kubuntu LTS 20.04 - It happens from my point of 
view only with battary power.
May be it is related to also happen 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1873325 with missing 
firmware, that also not can  found in git repo for Linux Firmware

notebook:~$ uname -a
Linux notebook 5.4.0-37-generic #41-Ubuntu SMP Wed Jun 3 18:57:02 UTC 2020 
x86_64 x86_64 x86_64 GNU/Linux


Jun 20 21:55:02 notebook systemd[1]: snapd.service: Succeeded.
Jun 20 21:55:08 notebook kernel: [   20.435116] [drm:amdgpu_job_timedout 
[amdgpu]] *ERROR* ring gfx timeout, signaled seq=1, emitted seq=3
Jun 20 21:55:08 notebook kernel: [   20.435251] [drm:amdgpu_job_timedout 
[amdgpu]] *ERROR* Process information: process Xorg pid 843 thread Xorg:cs0 pid 
850
Jun 20 21:55:08 notebook kernel: [   20.435259] amdgpu 0000:03:00.0: GPU reset 
begin!
Jun 20 21:55:08 notebook systemd[1]: NetworkManager-dispatcher.service: 
Succeeded.
Jun 20 21:55:09 notebook kernel: [   21.587697] amdgpu 0000:03:00.0: GPU reset 
succeeded, trying to resume
Jun 20 21:55:09 notebook kernel: [   21.588322] [drm] PCIE GART of 1024M 
enabled (table at 0x000000F400900000).
Jun 20 21:55:09 notebook kernel: [   21.588923] [drm] PSP is resuming...
Jun 20 21:55:09 notebook kernel: [   21.608781] [drm] reserve 0x400000 from 
0xf47f800000 for PSP TMR
Jun 20 21:55:09 notebook kernel: [   21.620978] [drm] psp command failed and 
response status is (0x7)
Jun 20 21:55:10 notebook kernel: [   22.254474] [drm] VCN decode and encode 
initialized successfully(under DPG Mode).
Jun 20 21:55:10 notebook kernel: [   22.254485] amdgpu 0000:03:00.0: ring gfx 
uses VM inv eng 0 on hub 0
Jun 20 21:55:10 notebook kernel: [   22.254488] amdgpu 0000:03:00.0: ring 
comp_1.0.0 uses VM inv eng 1 on hub 0
Jun 20 21:55:10 notebook kernel: [   22.254491] amdgpu 0000:03:00.0: ring 
comp_1.1.0 uses VM inv eng 4 on hub 0
Jun 20 21:55:10 notebook kernel: [   22.254493] amdgpu 0000:03:00.0: ring 
comp_1.2.0 uses VM inv eng 5 on hub 0
Jun 20 21:55:10 notebook kernel: [   22.254496] amdgpu 0000:03:00.0: ring 
comp_1.3.0 uses VM inv eng 6 on hub 0
Jun 20 21:55:10 notebook kernel: [   22.254498] amdgpu 0000:03:00.0: ring 
comp_1.0.1 uses VM inv eng 7 on hub 0
Jun 20 21:55:10 notebook kernel: [   22.254500] amdgpu 0000:03:00.0: ring 
comp_1.1.1 uses VM inv eng 8 on hub 0
Jun 20 21:55:10 notebook kernel: [   22.254502] amdgpu 0000:03:00.0: ring 
comp_1.2.1 uses VM inv eng 9 on hub 0
Jun 20 21:55:10 notebook kernel: [   22.254505] amdgpu 0000:03:00.0: ring 
comp_1.3.1 uses VM inv eng 10 on hub 0
Jun 20 21:55:10 notebook kernel: [   22.254508] amdgpu 0000:03:00.0: ring 
kiq_2.1.0 uses VM inv eng 11 on hub 0
Jun 20 21:55:10 notebook kernel: [   22.254510] amdgpu 0000:03:00.0: ring sdma0 
uses VM inv eng 0 on hub 1
Jun 20 21:55:10 notebook kernel: [   22.254512] amdgpu 0000:03:00.0: ring 
vcn_dec uses VM inv eng 1 on hub 1
Jun 20 21:55:10 notebook kernel: [   22.254514] amdgpu 0000:03:00.0: ring 
vcn_enc0 uses VM inv eng 4 on hub 1
Jun 20 21:55:10 notebook kernel: [   22.254516] amdgpu 0000:03:00.0: ring 
vcn_enc1 uses VM inv eng 5 on hub 1
Jun 20 21:55:10 notebook kernel: [   22.254518] amdgpu 0000:03:00.0: ring 
vcn_jpeg uses VM inv eng 6 on hub 1
Jun 20 21:55:10 notebook kernel: [   22.266075] [drm] recover vram bo from 
shadow start
Jun 20 21:55:10 notebook kernel: [   22.266076] [drm] recover vram bo from 
shadow done
Jun 20 21:55:10 notebook kernel: [   22.266077] [drm] Skip scheduling IBs!
Jun 20 21:55:10 notebook kernel: [   22.266109] ------------[ cut here 
]------------
Jun 20 21:55:10 notebook kernel: [   22.266116] WARNING: CPU: 2 PID: 597 at 
include/linux/dma-fence.h:533 drm_sched_resubmit_jobs+0x152/0x160 [gpu_sched]
Jun 20 21:55:10 notebook kernel: [   22.266116] Modules linked in: cmac 
algif_hash algif_skcipher af_alg bnep 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 nls_iso8859_1 snd_pcm 
joydev rtsx_usb_ms snd_seq_midi memstick snd_seq_midi_event uvcvideo 
videobuf2_vmalloc edac_mce_amd btusb snd_rawmidi btrtl videobuf2_memops kvm_amd 
btbcm videobuf2_v4l2 ccp btintel videobuf2_common rtl8821ce(OE) bluetooth kvm 
videodev snd_seq mc input_leds snd_seq_device asus_nb_wmi serio_raw snd_timer 
asus_wmi wmi_bmof sparse_keymap ecdh_generic ecc hid_multitouch k10temp snd 
snd_pci_acp3x cfg80211 soundcore mac_hid sch_fq_codel parport_pc ppdev lp 
parport ip_tables x_tables autofs4 rtsx_usb_sdmmc rtsx_usb hid_generic amdgpu 
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel amd_iommu_v2 gpu_sched 
i2c_algo_bit ttm drm_kms_helper aesni_intel crypto_simd syscopyarea cryptd 
sysfillrect glue_helper sysimgblt ahci fb_sys_fops libahci i2c_piix4 drm nvme
Jun 20 21:55:10 notebook kernel: [   22.266144]  nvme_core wmi video i2c_hid hid
Jun 20 21:55:10 notebook kernel: [   22.266148] CPU: 2 PID: 597 Comm: 
kworker/2:2 Tainted: G           OE     5.4.0-37-generic #41-Ubuntu
Jun 20 21:55:10 notebook kernel: [   22.266149] Hardware name: ASUSTeK COMPUTER 
INC. VivoBook_ASUSLaptop X712DA_D712DA/X712DA, BIOS X712DA.303 03/31/2020
Jun 20 21:55:10 notebook kernel: [   22.266152] Workqueue: events 
drm_sched_job_timedout [gpu_sched]
Jun 20 21:55:10 notebook kernel: [   22.266155] RIP: 
0010:drm_sched_resubmit_jobs+0x152/0x160 [gpu_sched]
Jun 20 21:55:10 notebook kernel: [   22.266157] Code: 41 5c 41 5d 41 5e 41 5f 
5d c3 49 8b 46 10 31 c9 48 c7 80 80 00 00 00 00 00 00 00 49 8b 7f 70 31 c0 83 
e7 01 74 04 0f 0b eb bf <0f> 0b eb c7 0f 0b eb 8b 66 0f 1f 44 00 00 0f 1f 44 00 
00 55 48 89
Jun 20 21:55:10 notebook kernel: [   22.266158] RSP: 0018:ffffa8aa00d13d28 
EFLAGS: 00010246
Jun 20 21:55:10 notebook kernel: [   22.266160] RAX: 0000000000000000 RBX: 
0000000000000001 RCX: 0000000000000000
Jun 20 21:55:10 notebook kernel: [   22.266160] RDX: ffff95528b1b4c40 RSI: 
ffff9552946d95f8 RDI: 0000000000000000
Jun 20 21:55:10 notebook kernel: [   22.266161] RBP: ffffa8aa00d13d60 R08: 
0000000000000471 R09: 0000000000000004
Jun 20 21:55:10 notebook kernel: [   22.266162] R10: 0000000000000000 R11: 
0000000000000001 R12: ffff955286647ad8
Jun 20 21:55:10 notebook kernel: [   22.266162] R13: ffff955286647980 R14: 
ffff9552946d9400 R15: ffff95528b1b4c00
Jun 20 21:55:10 notebook kernel: [   22.266164] FS:  0000000000000000(0000) 
GS:ffff955298a80000(0000) knlGS:0000000000000000
Jun 20 21:55:10 notebook kernel: [   22.266164] CS:  0010 DS: 0000 ES: 0000 
CR0: 0000000080050033
Jun 20 21:55:10 notebook kernel: [   22.266165] CR2: 00005634e9b569c8 CR3: 
0000000188566000 CR4: 00000000003406e0
Jun 20 21:55:10 notebook kernel: [   22.266166] Call Trace:
Jun 20 21:55:10 notebook kernel: [   22.266245]  
amdgpu_device_gpu_recover+0x6cd/0x95a [amdgpu]
Jun 20 21:55:10 notebook kernel: [   22.266325]  
amdgpu_job_timedout+0x103/0x130 [amdgpu]
Jun 20 21:55:10 notebook kernel: [   22.266328]  
drm_sched_job_timedout+0x44/0x90 [gpu_sched]
Jun 20 21:55:10 notebook kernel: [   22.266334]  process_one_work+0x1eb/0x3b0
Jun 20 21:55:10 notebook kernel: [   22.266336]  worker_thread+0x4d/0x400
Jun 20 21:55:10 notebook kernel: [   22.266340]  kthread+0x104/0x140
Jun 20 21:55:10 notebook kernel: [   22.266342]  ? process_one_work+0x3b0/0x3b0
Jun 20 21:55:10 notebook kernel: [   22.266343]  ? kthread_park+0x90/0x90
Jun 20 21:55:10 notebook kernel: [   22.266348]  ret_from_fork+0x22/0x40
Jun 20 21:55:10 notebook kernel: [   22.266350] ---[ end trace 802096797f845f8e 
]---
Jun 20 21:55:10 notebook kernel: [   22.266383] amdgpu 0000:03:00.0: GPU 
reset(2) succeeded!
Jun 20 21:55:10 notebook kernel: [   22.266532] amdgpu 0000:03:00.0: AMD-Vi: 
Event logged [IO_PAGE_FAULT domain=0x0000 address=0x1860002a0 flags=0x0070]
Jun 20 21:55:10 notebook kernel: [   22.266540] amdgpu 0000:03:00.0: AMD-Vi: 
Event logged [IO_PAGE_FAULT domain=0x0000 address=0x186040000 flags=0x0070]
Jun 20 21:55:10 notebook sddm[841]: Setting default cursor
Jun 20 21:55:10 notebook kernel: [   22.720098] [drm:amdgpu_cs_ioctl [amdgpu]] 
*ERROR* Failed to initialize parser -125!
Jun 20 21:55:10 notebook sddm[841]: Running display setup script  
"/usr/share/sddm/scripts/Xsetup"
Jun 20 21:55:10 notebook sddm[841]: Display server started.
Jun 20 21:55:10 notebook sddm[841]: Reading from 
"/usr/share/xsessions/plasma.desktop"
Jun 20 21:55:10 notebook sddm[841]: Reading from 
"/usr/share/xsessions/plasma.desktop"
Jun 20 21:55:10 notebook sddm[841]: Session "plasma.desktop" selected, command: 
"/usr/bin/startplasma-x11"
Jun 20 21:55:10 notebook sddm[841]: Adding cookie to 
"/var/run/sddm/{75d99f69-3299-4a8e-aefc-a30937665735}"

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https://bugs.launchpad.net/bugs/1870971

Title:
  [amdgpu] Xubuntu 20.04 boots to black screen on Lenovo Ideapad
  L340-17API

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Freshly installed Xubuntu 20.04 shows black screen instead of login
  screen upon boot on Lenovo Ideapad L340-17API. It is not possible to
  chvt to text terminal when boot is stuck on black screen.

  Booting with 'nomodeset' kernel option works properly but is not an
  option (e.g. screen brightness is not adjustable in this case).

  Another workaround is to ssh to laptop and run systemctl restart
  display-manager.service. After 5-10 seconds upon executing this
  command perfectly working login screen appears.

  Check dmesg. There is apparently related messages from amdgpu driver:

  ...
  апр 05 20:46:45 kernel: [drm:amdgpu_dm_set_crtc_irq_state [amdgpu]] *ERROR* 
amdgpu_dm_set_crtc_irq_state: crtc is NULL at id :3
  апр 05 20:46:45 kernel: [drm:amdgpu_dm_set_crtc_irq_state [amdgpu]] *ERROR* 
amdgpu_dm_set_crtc_irq_state: crtc is NULL at id :3
  апр 05 20:46:45 kernel: [drm:amdgpu_dm_set_crtc_irq_state [amdgpu]] *ERROR* 
amdgpu_dm_set_crtc_irq_state: crtc is NULL at id :3
  апр 05 20:46:45 kernel: [drm:amdgpu_dm_set_crtc_irq_state [amdgpu]] *ERROR* 
amdgpu_dm_set_crtc_irq_state: crtc is NULL at id :3
  апр 05 20:46:45 kernel: [drm:amdgpu_dm_set_pflip_irq_state [amdgpu]] *ERROR* 
amdgpu_dm_set_pflip_irq_state: crtc is NULL at id :3
  апр 05 20:46:45 kernel: [drm:amdgpu_dm_set_pflip_irq_state [amdgpu]] *ERROR* 
amdgpu_dm_set_pflip_irq_state: crtc is NULL at id :3
  апр 05 20:46:45 kernel: [drm:amdgpu_dm_set_pflip_irq_state [amdgpu]] *ERROR* 
amdgpu_dm_set_pflip_irq_state: crtc is NULL at id :3
  апр 05 20:46:45 kernel: [drm:amdgpu_dm_set_pflip_irq_state [amdgpu]] *ERROR* 
amdgpu_dm_set_pflip_irq_state: crtc is NULL at id :3
  апр 05 20:46:45 kernel: [drm:amdgpu_dm_set_vupdate_irq_state [amdgpu]] 
*ERROR* amdgpu_dm_set_vupdate_irq_state: crtc is NULL at id :3
  апр 05 20:46:45 kernel: [drm:amdgpu_dm_set_vupdate_irq_state [amdgpu]] 
*ERROR* amdgpu_dm_set_vupdate_irq_state: crtc is NULL at id :3
  апр 05 20:46:45 kernel: [drm:amdgpu_dm_set_vupdate_irq_state [amdgpu]] 
*ERROR* amdgpu_dm_set_vupdate_irq_state: crtc is NULL at id :3
  апр 05 20:46:45 kernel: [drm:amdgpu_dm_set_vupdate_irq_state [amdgpu]] 
*ERROR* amdgpu_dm_set_vupdate_irq_state: crtc is NULL at id :3
  апр 05 20:46:45 kernel: [drm] recover vram bo from shadow start
  апр 05 20:46:45 kernel: [drm] recover vram bo from shadow done
  апр 05 20:46:45 kernel: [drm] Skip scheduling IBs!
  апр 05 20:46:45 kernel: ------------[ cut here ]------------
  апр 05 20:46:45 kernel: WARNING: CPU: 3 PID: 793 at 
include/linux/dma-fence.h:533 drm_sched_resubmit_jobs+0x152/0x160 [gpu_sched]
  апр 05 20:46:45 kernel: Modules linked in: cmac algif_hash algif_skcipher 
af_alg bnep zram nls_iso8859_1 snd_hda_codec_realtek snd_hda_codec_generic 
ledtrig_audio snd_hda_codec_hdmi snd_hda_intel snd_intel_nhlt snd_hda_codec >
  апр 05 20:46:45 kernel: CPU: 3 PID: 793 Comm: kworker/3:4 Tainted: G          
 OE     5.4.0-21-generic #25-Ubuntu
  апр 05 20:46:45 kernel: Hardware name: LENOVO 81LY/LNVNB161216, BIOS ARCN32WW 
07/11/2019
  апр 05 20:46:45 kernel: Workqueue: events drm_sched_job_timedout [gpu_sched]
  апр 05 20:46:45 kernel: RIP: 0010:drm_sched_resubmit_jobs+0x152/0x160 
[gpu_sched]
  апр 05 20:46:45 kernel: Code: 41 5c 41 5d 41 5e 41 5f 5d c3 49 8b 46 10 31 c9 
48 c7 80 80 00 00 00 00 00 00 00 49 8b 7f 70 31 c0 83 e7 01 74 04 0f 0b eb bf 
<0f> 0b eb c7 0f 0b eb 8b 66 0f 1f 44 00 00 0f 1f 44 00 00 83 7f 4c
  апр 05 20:46:45 kernel: RSP: 0018:ffffa4dc806d7d28 EFLAGS: 00010246
  апр 05 20:46:45 kernel: RAX: 0000000000000000 RBX: 0000000000000001 RCX: 
0000000000000000
  апр 05 20:46:45 kernel: RDX: ffff8cc9a6fc9180 RSI: ffff8cc9ac4609f8 RDI: 
0000000000000000
  апр 05 20:46:45 kernel: RBP: ffffa4dc806d7d60 R08: 000000000000047a R09: 
0000000000000004
  апр 05 20:46:45 kernel: R10: 0000000000000000 R11: 0000000000000001 R12: 
ffff8cc9ac463c00
  апр 05 20:46:45 kernel: R13: ffff8cc9a63c7980 R14: ffff8cc9ac460800 R15: 
ffff8cc9a6fc9140
  апр 05 20:46:45 kernel: FS:  0000000000000000(0000) GS:ffff8cc9b88c0000(0000) 
knlGS:0000000000000000
  апр 05 20:46:45 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  апр 05 20:46:45 kernel: CR2: 00007f275ff6c000 CR3: 00000001af148000 CR4: 
00000000003406e0
  апр 05 20:46:45 kernel: Call Trace:
  апр 05 20:46:45 kernel:  amdgpu_device_gpu_recover+0x6cd/0x95a [amdgpu]
  апр 05 20:46:45 kernel:  amdgpu_job_timedout+0x103/0x130 [amdgpu]
  апр 05 20:46:45 kernel:  drm_sched_job_timedout+0x44/0x90 [gpu_sched]
  апр 05 20:46:45 kernel:  process_one_work+0x1eb/0x3b0
  апр 05 20:46:45 kernel:  worker_thread+0x4d/0x400
  апр 05 20:46:45 kernel:  kthread+0x104/0x140
  апр 05 20:46:45 kernel:  ? process_one_work+0x3b0/0x3b0
  апр 05 20:46:45 kernel:  ? kthread_park+0x90/0x90
  апр 05 20:46:45 kernel:  ret_from_fork+0x22/0x40
  апр 05 20:46:45 kernel: ---[ end trace fb203c8f6a7afd49 ]---
  ...

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
  Uname: Linux 5.4.0-21-generic x86_64
  ApportVersion: 2.20.11-0ubuntu22
  Architecture: amd64
  BootLog: Error: [Errno 13] Отказано в доступе: '/var/log/boot.log'
  CompositorRunning: None
  CurrentDesktop: XFCE
  Date: Sun Apr  5 20:52:30 2020
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  DkmsStatus: rtl8821ce, 5.5.2.1, 5.4.0-21-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
  GpuHangFrequency: Several times a week
  GpuHangReproducibility: Yes, I can easily reproduce it
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard:
   Advanced Micro Devices, Inc. [AMD/ATI] Picasso [1002:15d8] (rev c4) (prog-if 
00 [VGA controller])
     Subsystem: Lenovo Picasso [17aa:3808]
  InstallationDate: Installed on 2020-04-04 (1 days ago)
  InstallationMedia: Xubuntu 20.04 LTS "Focal Fossa" - Beta amd64 (20200404)
  MachineType: LENOVO 81LY
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-21-generic 
root=/dev/mapper/vgxubuntu-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/11/2019
  dmi.bios.vendor: LENOVO
  dmi.bios.version: ARCN32WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: LNVNB161216
  dmi.board.vendor: LENOVO
  dmi.board.version: No DPK
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad L340-17API
  dmi.modalias: 
dmi:bvnLENOVO:bvrARCN32WW:bd07/11/2019:svnLENOVO:pn81LY:pvrLenovoIdeaPadL340-17API:rvnLENOVO:rnLNVNB161216:rvrNoDPK:cvnLENOVO:ct10:cvrLenovoIdeaPadL340-17API:
  dmi.product.family: IdeaPad L340-17API
  dmi.product.name: 81LY
  dmi.product.sku: LENOVO_MT_81LY_BU_idea_FM_IdeaPad L340-17API
  dmi.product.version: Lenovo IdeaPad L340-17API
  dmi.sys.vendor: LENOVO
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.100-4
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.2-1ubuntu1
  version.libgl1-mesa-glx: libgl1-mesa-glx N/A
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.7-2ubuntu2
  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+git20190815-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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