KVM - virt manager - no VM won't boot - VMs CPU at 100%

[uros]

Hi,

after newly install of kvm and virt-manager, VMs won’t boot. Not existing ones nor newly created. When starting VM, nothing happens, only black screen is visible and VMs CPU is running at 100%.
No error is displayed.

Does anybody else have the same problem?

Kind Regards

[hui]

Basic search:

Virtual Machines will not start after last tumbleweed upgrade

After the last Tumbleweed upgrade to today’s 20250328 none of my qemu Virtual Machines boot anymore. When I start them up they hung up in a perpetual black screen and working 100% of the CPU, but absolutely nothing else happens. No console, no image, no error message. I usually manage the VMs with virt-man, but I also tried virt-viewer and qemu cli but nothing happened… Anyone else with the same issue?

[a017886]

… can confirm the solution for Slowroll.
Same behavior:

• “Display output is not active”
• VMs CPU is running at 100%
• shutdown impossible

Downgraded qemu-ovmf-x86_64: 202502-1.1 → 202411-1.2
Message “Display output is not active” still remains, but usual output (login screen) is there again. CPU is running at normal load and you can shutdown the guest from vmm.