AMD-Vi error message during boot

[snow]

When I boot my KDE 20.04 on my AMD-based Thinkpad T495 I see before the login screen the following error message:

0.703348] Initramfs unpacking failed: Decoding failed
0.713878] pci 0000:00:00.2 AMD.Vi: Unable ro read/write to IOMMU perf couter
0.754103] tpm tpm0: tpm:try:transmit: send(): error -5
0.754122] tpm tpm0: [Firmware Bug] TPM interrupt not working, polling inst

Then I see the login screen and everything looks fine. I can log in normally.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: systemd 245.4-4ubuntu3
ProcVersionSignature: Ubuntu 5.4.0-28.32-generic 5.4.30
Uname: Linux 5.4.0-28-generic x86_64
ApportVersion: 2.20.11-0ubuntu27
Architecture: amd64
CasperMD5CheckResult: skip
CurrentDesktop: KDE
Date: Wed May 6 14:16:15 2020
InstallationDate: Installed on 2020-05-01 (4 days ago)
InstallationMedia: Kubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: LENOVO 20NKS01Y00
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-28-generic root=UUID=537c947f-55fc-4bba-bb91-e7c4b91e39e6 ro quiet splash
SourcePackage: systemd
SystemdDelta:
 [EXTENDED] /usr/lib/systemd/system/rc-local.service → /usr/lib/systemd/system/rc-local.service.d/debian.conf
 [EXTENDED] /usr/lib/systemd/system/user@.service → /usr/lib/systemd/system/user@.service.d/timeout.conf

 2 overridden configuration files found.
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/06/2020
dmi.bios.vendor: LENOVO
dmi.bios.version: R12ET49W(1.19 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20NKS01Y00
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrR12ET49W(1.19):bd01/06/2020:svnLENOVO:pn20NKS01Y00:pvrThinkPadT495:rvnLENOVO:rn20NKS01Y00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T495
dmi.product.name: 20NKS01Y00
dmi.product.sku: LENOVO_MT_20NK_BU_Think_FM_ThinkPad T495
dmi.product.version: ThinkPad T495
dmi.sys.vendor: LENOVO