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List:       debian-user
Subject:    Re: Screen scaling and 4k support in libvirt with qemu/kvm
From:       Linux-Fan <Ma_Sys.ma () web ! de>
Date:       2021-01-27 9:55:53
Message-ID: cone.1611741353.764373.33746.1000 () masysma-18
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Linux-Fan writes:

> Rainer Dorsch writes:
>
>> Hi,
>>
>> with virtualbox, it is possible that the guest system rescales its screen if  
>> I change the window for the guest (and virtualbox guest tools are installed  
>> at
>> least). Does anybody know if that is possible with virt-manager/libvirt/qemu/
>> kvm?
>
> It is certainly possible to set the guest resolution to exactly match the  
> window size. I am not sure if it can be configured to _automatically_ adjust  
> the guest resolution upon window size change though.
>
> The protocol must support it, because I know that for Windows guest systems,  
> the Windows resolution adjusts to the window size. Unlike with Linux guests,  
> it does this in fixed steps of "common" monitor resolutions and thus does  
> not usually match the exact window size but something smaller.
>
> If you find out how to apply the sizes automatically on Linux, I'd be  
> interested to learn how that works :) If no „solution" exists yet, it might  
> be easy to script (although I have not bothered to do that so far).

Update: I found out how to enable automatic resizing:

 * Install `qemu-guest-agent` in the VM in addition to running
   `spice-vdagent`
 * Set Video model to VGA

This enables automatic resizing here although from "feeling" the graphics  
performance is worse than with QXL or virtio.

HTH
Linux-Fan

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