Updated to 8.2 - DMA error

[NeoJim]

I had a similar error dmar error dma pte for vpfn 0xcf4de already set,
Saw another article on https://forum.openmediavault.org/ by searching just that it was the 3rd hit on Google.
Saw about disabling virtualization. I can't believe that actually worked.
Nothing in that error would have caused me to believe that virtualization was the issue.
If anyone else has insight on that, please enlighten me.

 

[NeoJim]

I had a similar error when installing Proxmox Backup Server on a Dell PowerEdge r410
dmar error dma pte for vpfn 0xcf4de already set,
Saw another article on https://forum.openmediavault.org/ by searching just that and it was the 3rd hit on Google.
Said about disabling virtualization. I can't believe that actually worked.
Nothing in that error would have caused me to believe that virtualization was the issue.
If anyone else has insight on that, please enlighten me.

 

[Stefan Radman]

Hi,

did you already try disabling the intel_iommu setting on the kernel commandline? The default for the setting changed in kernel 6.8 and your backtrace mentions IOMMU: https://pve.proxmox.com/wiki/Roadmap#8.2-known-issues

I had the exact same issue (DMAR ERROR) installing 8.3.1 on a 12 year old Dell R710.
Adding "nomodeset intel_iommu=off" to the installer kernel command line solved it for me.
https://pve.proxmox.com/wiki/Installation#nomodeset_kernel_param
Thanks for the hints. Now it is running like a charm

 

[Gavino]

I'm installing on an old Dell R710 as well. Thanks for the info! I selected "Install Proxmox Backup Server (Console)" and hit "e" to edit. At the line starting with "linux" I appended "nomodeset intel_iommu=off" to the end. Then Ctrl-x and I'm good. When editing the GRUB file, it's best to go to the line below the one that starts with "linux" and step backwards - otherwise it takes forever to step through the whole line.