VM display freezes with QXL

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CreeperKong

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May 16, 2021
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VM display may suddenly freeze when GPU is selected to QXL.
Just the display freezes, I can still access the VM with serial console or SSH.
 
I've seen this happen once in a while with VMs running LMDE7 (and the remote-viewer running on Mint22.3) but it did not happen with older VMs. I don't think it's related to recent Proxmox updates. I don't know who maintains SPICE/qxl or what could be the exact cause. I might happen more often on VMs with spice_enhancements: videostreaming=filter but I'm not sure.
Do you see any possibly related messages in the system log (inside the VM) after the freeze?
 
leesteken said:
I've seen this happen once in a while with VMs running LMDE7 (and the remote-viewer running on Mint22.3) but it did not happen with older VMs. I don't think it's related to recent Proxmox updates. I don't know who maintains SPICE/qxl or what could be the exact cause. I might happen more often on VMs with spice_enhancements: videostreaming=filter but I'm not sure.
Do you see any possibly related messages in the system log (inside the VM) after the freeze?
Click to expand...
I have tried all none filter, it seems not the culprit.
Can you ping VM or connect with SSH when this happens?
 
Last edited:
leesteken said:
What operating system is running inside your VM? On what operating system do your run the viewer? Do you have the same issues when using VirtIO-GPU instead? Does it happen less often when you increase the memory for SPICE?
Click to expand...
I use Alpine 3.23, Ubuntu 24.04, RHEL 10.1. Have the issue when QXL is selected.
VirtIO-GPU and VGA works fine. I have no GPU so I am not able to test out VirGL.
 
In the past I've seen guests freeze from not having enough video memory (VRAM) for whatever resolution is being used.
 
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