I can only install Qubes OS without IOMMU but then it doesn't work correctly

[apparatus]

You can also try to add x2apic=false to the Xen command line in grub:

Trouble installing on Lenovo Ideapad 5 Pro

Most likely this issue. You can probably solve this by adding x2apic=false to the grub item. To do this, when grub shows up, navigate to your desired installation option ( “install with kernel latest”, e.g.). Then, press e key to edit that option. Scroll down with arrow keys, and find the line beginning with “multiboot2”, and add x2apic=false to the end of that line.