** Description changed:

  Lenovo Ideapad S540 13ARE (AMD Ryzen 4800U).
- Ubuntu Budgie 20.04.1 LTS, updated kernel to 5.8.5.
- Most things work just fine. If not for the errors shown during boot, I would 
not have noticed the issues.Video (native resolutions works), audio, wifi, 
suspend, the quick buttons (brightness, volume etc) all work fine. However 
during boot, errors are shortly shown:
+ Ubuntu Budgie 20.04.1 LTS, updated kernel to 5.8.5. Secure Boot disabled. 
Clean install with entire disk (Windows came preinstalled) wiped out.
+ 
+ Most things work just fine. If not for the errors shown during boot, I
+ would not have noticed the issues.Video (native resolutions works),
+ audio, wifi, suspend, the quick buttons (brightness, volume etc) all
+ work fine. However during boot, errors are shortly shown:
  
  asterix@Idefix:~$ sudo dmesg -l err
  [    3.204455] pci 0000:00:00.2: AMD-Vi: Unable to read/write to IOMMU perf 
counter.
  [    4.901524] I2C multi instantiate pseudo device driver INT3515:00: IRQ 
index 1 not found
  [    4.919327] snd_pci_acp3x 0000:03:00.5: Invalid ACP audio mode : 0
  [    4.939476] ACPI Error: No handler for Region [ECSI] (00000000bf2d92b9) 
[EmbeddedControl] (20200528/evregion-127)
  [    4.939724] ACPI Error: Region EmbeddedControl (ID=3) has no handler 
(20200528/exfldio-261)
  [    4.939929] ACPI Error: Aborting method \_SB.UBTC.ECRD due to previous 
error (AE_NOT_EXIST) (20200528/psparse-529)
  [    4.940212] ACPI Error: Aborting method \_SB.UBTC._DSM due to previous 
error (AE_NOT_EXIST) (20200528/psparse-529)
  [    4.940517] ucsi_acpi USBC000:00: ucsi_acpi_dsm: failed to evaluate _DSM 2
  [    5.235689] acp_pdm_mach acp_pdm_mach.0: snd_soc_register_card(acp) 
failed: -517
  [    6.273068] [drm:dm_helpers_dp_write_dpcd [amdgpu]] *ERROR* Failed to find 
connector for link!
  [    6.273591] [drm:dm_helpers_dp_write_dpcd [amdgpu]] *ERROR* Failed to find 
connector for link!
  [    6.273748] [drm:dm_helpers_dp_write_dpcd [amdgpu]] *ERROR* Failed to find 
connector for link!
  [    7.036019] [drm:mod_hdcp_add_display_to_topology [amdgpu]] *ERROR* Failed 
to add display topology, DTM TA is not initialized.
  [    7.891436] Bluetooth: hci0: Failed to send Intel_Write_DDC (-22)```
  
  lspci-vnvn.log: https://pastebin.com/Kygie8nu
  
  What can I do to help solve this? Note I am not a developer and a Linux
  novice.

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https://bugs.launchpad.net/bugs/1893624

Title:
  Ryzen 4800u, kernel 5.8.5 boot errors (AMD-Vi, ACPI, HDCP, Bluetooth)

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