Fix reboots on suspend:
* 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).

What does not work:
* Webcam
* MST

Not tested:
* Bluetooth

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