the out put of "virsh dumpxml"
...
    <graphics type='vnc' port='5900' autoport='yes' listen='0.0.0.0' 
keymap='en-us'>
      <listen type='address' address='0.0.0.0'/>
    </graphics>
    <video>
      <model type='virtio' heads='1' primary='yes'/>
      <alias name='video0'/>
      <address type='pci' domain='0x0000' bus='0x05' slot='0x00' 
function='0x0'/>
    </video>
...

This should be OpenStack configured for VNC and qemu devices. If I
manual remove them, and the virt-manager can become normally which show
grub menu, boot message and login etc.

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https://bugs.launchpad.net/bugs/1877083

Title:
  qemu vnc console can only show "no suitable video mode" on taishan2280
  server

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