activate Linux as type of OS in BIOS (enables S3 instead of S2idle)
add acpi_sleep=nonvs in GRUB_CMDLINE_LINUX in /etc/default/grub
smt=on seems to help
Boot is a bit slow, but doing this after boot solves that, it’s possible to set under GRUB_CMDLINE_XEN_DEFAULT with dom0_max_vcpus=2 dom0_vcpus_pin but it seems that vm get this as well.
sudo xl vcpu-set Domain-0 2
sudo xl vcpu-pin Domain-0 0 0
sudo xl vcpu-pin Domain-0 1 1
Running Qubes R4.1 with kernel 5.11.4-1.fc32.qubes.x86_64 and linux-firmware 20210208-106
On install add console=vga=none dom0_max_vcpus=2 dom0_vcpus_pin to grub
Use Debian 11 for template VMs since Debian 10 is broken (at time of writing) as network-vm.
Wireless works in Fedora 33, but not out of the box in Debian 11.
Overall there’s still a bit sluggishnes from time to time. Pinning all VMs to cores helps.
Dual 2K screens acheived via 2x DP to USB-C adapter, multiport adapters does not work (single DP).
It comes with kernel 5.10.25 but after adding the Parameters mentioned by Josef it’s as fast as one would expect.
I’ve yet to test suspend / resume, so cannot say anything about that.