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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