ASUS Vivobook TP420IA boots to black screen

[Sokar]

Hello all,

I’m a novice Linux user and wanted to switch to Manjaro for my new notebook. I bought a ASUS Vivobook TP420IA Convertible, because it suits my specs: Ryzen 4700U, 16GB Ram, 500GB SSD.
Booting from USB works fine and after some tests, I decided to install. I used Manjaro 20.1 XFCE. And at first, it worked fine, but a few reboots, now it always stops at a black screen.

I found another thread with a similar problem, but a HP 445 G7, but at least It got some Idea (/t/impossible-installation-on-hp-455-g7-amd-renoir-4500u/26755/12).

I can go to the console by pressing CRTL+ALT+F2, update everything and was able to upload these logfiles with the commands stated in the previous thread:
journalctl -b -0 | curl --upload-file - aptget xyz/boot.0.log: aptget xyz/YzFVt/boot.0.log
inxi -Fazy | curl --upload-file - aptget xyz/inxi.log: aptget xyz/AbH39/inxi.log

(removed https and inserted some spaces in there because apprently, as a new user, I’m not allowed to post links)

startx doesn’t work and just goes back to the console. I’mt not experience enough to get useful information from the log. The BIOS isn’t extensive, but I deactivated Secure Boot and Fast Boot, there is not much else I can do.

I hope someone here can make something of the log or has another idea, what goes wrong. Thanks in advance for any help!

[megavolt]

Hello

@Sokar

And at first, it worked fine, but a few reboots, now it always stops at a black screen.

So the question would be: What have been changed?

I see some problems with ACPI:

Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\SMIB], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI Warning: NsLookup: Type mismatch on SMIB (Integer), searching for (RegionField) (20200528/nsaccess-697)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.VER1], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.CCI0], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.CCI1], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.CCI2], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.CCI3], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.CTL0], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.CTL1], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.CTL2], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.CTL3], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.CTL4], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.CTL5], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.CTL6], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.CTL7], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGI0], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGI1], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGI2], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGI3], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGI4], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGI5], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGI6], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGI7], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGI8], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGI9], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGIA], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGIB], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGIC], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGID], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGIE], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGIF], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGO0], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGO1], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGO2], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGO3], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGO4], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGO5], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGO6], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGO7], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGO8], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGO9], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGOA], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGOB], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGOC], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGOD], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGOE], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0.MGOF], AE_ALREADY_EXISTS (20200528/dsfield-637)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.SBRG.EC0._Q50], AE_ALREADY_EXISTS (20200528/dswload2-326)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20200528/psobject-220)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI: Skipping parse of AML opcode: Method (0x0014)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI: 15 ACPI AML tables successfully acquired and loaded
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI: [Firmware Bug]: BIOS _OSI(Linux) query ignored
[...]
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: battery: ACPI: Battery Slot [BATT] (battery present)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.UBTC.M318.M31B], AE_NOT_FOUND (20200528/psargs-330)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI Error: Aborting method \_SB.UBTC.M318 due to previous error (AE_NOT_FOUND) (20200528/psparse-529)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI Error: Aborting method \_SB.UBTC._DSM due to previous error (AE_NOT_FOUND) (20200528/psparse-529)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ucsi_acpi USBC000:00: ucsi_acpi_dsm: failed to evaluate _DSM 2
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ucsi_acpi: probe of USBC000:00 failed with error -5
[...]
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: battery: ACPI: Battery Slot [BATT] (battery present)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.UBTC.M318.M31B], AE_NOT_FOUND (20200528/psargs-330)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI Error: Aborting method \_SB.UBTC.M318 due to previous error (AE_NOT_FOUND) (20200528/psparse-529)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ACPI Error: Aborting method \_SB.UBTC._DSM due to previous error (AE_NOT_FOUND) (20200528/psparse-529)
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ucsi_acpi USBC000:00: ucsi_acpi_dsm: failed to evaluate _DSM 2
Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: ucsi_acpi: probe of USBC000:00 failed with error -5

That should be solved first. Have look here:

How to Choose the Proper ACPI Kernel Argument

Difficulty: ★★☆☆☆ The introduction of Optimus laptops have created new challenges for Linux users. One of the biggest issues is having the proprietary graphics card work when the system boots. Many times the advice given is to add an Advanced Configuration and Power Interface (acpi ) kernel parameter to grub. While a specific acpi kernel parameter may be given, it is sometimes not appropriate to the hardware it is being applied to. This can cause system instability and some functions of the lap…

[HowTo] Power savings setup| 2021-01-25

Difficulty: ★★★☆☆ Important things Make sure that you have installed working fine for your hardware LTS kernel or lastest stable kernel Since 4.12 kernel you have to create a /etc/udev/rules.d/60-ioschedulers.rules with setup about I/O schedulers for different types storage. HowTo is described in this article. Make sure that you have installed for your CPU Microcode Make sure that you have added the appropriate entries in the GRUB configuration file Make sure you have installed all of the …

Then there is an issue with lightdm:

Okt 13 00:07:24 skr-ultrabook-lnx64 systemd[1]: lightdm.service: Scheduled restart job, restart counter is at 5.
Okt 13 00:07:24 skr-ultrabook-lnx64 audit[1]: SERVICE_START pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=lightdm comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Okt 13 00:07:24 skr-ultrabook-lnx64 audit[1]: SERVICE_STOP pid=1 uid=0 auid=4294967295 ses=4294967295 subj==unconfined msg='unit=lightdm comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Okt 13 00:07:24 skr-ultrabook-lnx64 systemd[1]: Stopped Light Display Manager.
Okt 13 00:07:24 skr-ultrabook-lnx64 systemd[1]: lightdm.service: Start request repeated too quickly.
Okt 13 00:07:24 skr-ultrabook-lnx64 systemd[1]: lightdm.service: Failed with result 'exit-code'.
Okt 13 00:07:24 skr-ultrabook-lnx64 systemd[1]: Failed to start Light Display Manager.

After 5 times trying to start, it stopped.

Then there is a problem with the backlight control:

Okt 13 00:07:24 skr-ultrabook-lnx64 systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:acpi_video0...
Okt 13 00:07:24 skr-ultrabook-lnx64 systemd[1]: Starting Load/Save Screen Backlight Brightness of backlight:amdgpu_bl0...
Okt 13 00:07:24 skr-ultrabook-lnx64 systemd-backlight[1036]: Failed to get backlight or LED device 'backlight:acpi_video0': No such device
Okt 13 00:07:24 skr-ultrabook-lnx64 systemd-backlight[1037]: amdgpu_bl0: Failed to write system 'brightness' attribute: No such device or address
Okt 13 00:07:24 skr-ultrabook-lnx64 systemd[1]: systemd-backlight@backlight:acpi_video0.service: Main process exited, code=exited, status=1/FAILURE
Okt 13 00:07:24 skr-ultrabook-lnx64 systemd[1]: systemd-backlight@backlight:acpi_video0.service: Failed with result 'exit-code'.
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: ------------[ cut here ]------------
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: WARNING: CPU: 5 PID: 1037 at drivers/gpu/drm/amd/amdgpu/../display/dc/core/dc_link.c:2546 dc_link_set_backlight_level+0x8a/0xf0 [amdgpu]
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: Modules linked in: cmac algif_hash algif_skcipher af_alg hid_logitech_dj(+) bnep uvcvideo btusb btrtl videobuf2_vmalloc btbcm videobuf2_memops videobuf2_v4l2 btintel videobuf2_common bluetooth videodev ecdh_generic ecc mc usbhid mousedev joydev hid_multitouch snd_acp3x_pdm_dma snd_acp3x_rn snd_soc_dmic hid_generic snd_soc_core asus_nb_wmi asus_wmi wmi_bmof sparse_keymap snd_compress ac97_bus snd_pcm_dmaengine edac_mce_amd kvm_amd squashfs kvm irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel amdgpu crypto_simd cryptd glue_helper rapl input_leds pcspkr loop iwlmvm mac80211 snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio libarc4 snd_hda_codec_hdmi nls_iso8859_1 gpu_sched nls_cp437 snd_hda_intel snd_intel_dspcfg i2c_algo_bit vfat iwlwifi fat ttm snd_hda_codec snd_hda_core sp5100_tco snd_hwdep k10temp cfg80211 i2c_piix4 drm_kms_helper snd_pcm cec snd_timer rc_core snd_rn_pci_acp3x snd ucsi_acpi syscopyarea tpm_crb snd_pci_acp3x sysfillrect ccp
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel:  typec_ucsi sysimgblt tpm_tis fb_sys_fops soundcore tpm_tis_core rfkill wmi typec evdev ac battery mac_hid i2c_hid tpm rng_core pinctrl_amd hid cm32181 industrialio acpi_cpufreq drm uinput crypto_user agpgart ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 serio_raw atkbd libps2 crc32c_intel xhci_pci xhci_pci_renesas xhci_hcd i8042 serio
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: CPU: 5 PID: 1037 Comm: systemd-backlig Not tainted 5.8.11-1-MANJARO #1
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: Hardware name: ASUSTeK COMPUTER INC. VivoBook_ASUSLaptop TP420IA_TM420IA/TP420IA, BIOS TP420IA.209 06/05/2020
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: RIP: 0010:dc_link_set_backlight_level+0x8a/0xf0 [amdgpu]
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: Code: 30 03 00 00 31 c0 48 8d 96 c0 01 00 00 48 8b 0a 48 85 c9 74 06 48 3b 59 08 74 20 83 c0 01 48 81 c2 c8 04 00 00 83 f8 06 75 e3 <0f> 0b 45 31 e4 5b 44 89 e0 5d 41 5c 41 5d 41 5e c3 48 98 48 69 c0
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: RSP: 0018:ffffa52fc0fbfdf0 EFLAGS: 00010246
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: RAX: 0000000000000006 RBX: ffff9ee639d77000 RCX: 0000000000000000
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: RDX: ffff9ee61a021e70 RSI: ffff9ee61a020000 RDI: 0000000000000000
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: RBP: ffff9ee61fbf0000 R08: 00000000000000ff R09: 000000000000000a
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: R10: 000000000000000a R11: f000000000000000 R12: 000000000000ff01
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: R13: 0000000000000000 R14: 000000000000ffff R15: ffff9ee6210dd160
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: FS:  00007f0d7fc8a000(0000) GS:ffff9ee63f540000(0000) knlGS:0000000000000000
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: CR2: 00005607e80c5978 CR3: 00000003e8fda000 CR4: 0000000000340ee0
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: Call Trace:
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel:  amdgpu_dm_backlight_update_status+0xb4/0xc0 [amdgpu]
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel:  backlight_device_set_brightness+0x7e/0x130
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel:  brightness_store+0x63/0x80
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel:  kernfs_fop_write+0xce/0x1b0
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel:  vfs_write+0xc7/0x1f0
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel:  ksys_write+0x67/0xe0
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel:  do_syscall_64+0x44/0x70
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel:  entry_SYSCALL_64_after_hwframe+0x44/0xa9
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: RIP: 0033:0x7f0d80aa4f67
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: Code: 0d 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: RSP: 002b:00007ffcc8412c08 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f0d80aa4f67
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: RDX: 0000000000000004 RSI: 00007ffcc8412cf0 RDI: 0000000000000004
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: RBP: 00007ffcc8412cf0 R08: 0000000000000000 R09: 0000000000000000
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: R13: 00005607e80af3c0 R14: 0000000000000004 R15: 00007f0d80b77720
Okt 13 00:07:24 skr-ultrabook-lnx64 kernel: ---[ end trace 8297b35ae8304bca ]---

The ACPI issue could be solved with an UEFI upgrade:

Okt 13 00:07:22 skr-ultrabook-lnx64 kernel: DMI: ASUSTeK COMPUTER INC. VivoBook_ASUSLaptop TP420IA_TM420IA/TP420IA, BIOS TP420IA.209 06/05/2020

Latest Version: 2020/07/06
Your Version: 2020/05/06

VivoBook Flip 14 TM420｜Laptops For Home｜ASUS Global

Maybe try also to completely disable the legacy BIOS mode, so run it in full UEFI mode.

Have also look at:
https://wiki.archlinux.org/index.php/AMDGPU#Enable_Southern_Islands_(SI)and_Sea_Islands(CIK)_support

[Sokar]

An update:

The UEFI Update was released while I posted the thread, so I missed it. But its updated now, but didn’t change anything.
Also I tried multiple combinations of acpi_osi=, but none did a improve it. I noticed that sometimes it boots properly, but ~9/10 times, it doesn’t.

Updated logs:
aptget.xyz/y6mkH/boot.0.log
aptget.xyz/y22zQ/inxi.log

Still working on the other linked threads.