Author Topic: New higher-res monitor with ArcaOS on VirtualBox  (Read 490 times)

David McKenna

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New higher-res monitor with ArcaOS on VirtualBox
« on: May 02, 2025, 10:18:07 pm »
 Got a newer wider screen monitor with 2560x1080 resolution to replace an old standard 1920x1080 res monitor. Booted directly to ArcaOS using Panorama it works fine. Running ArcaOS under VirtualBox inside Windows 11 it seems to only be able to get 1920x1080 resolution (black bars on left and right sides of full screen).

 Has anyone gotten higher than 1920x1080 in VirtualBox under Windows?

 I followed the Arca Noae instructions to change resolution using the VBoxManage app (I tried 2560x1080x16 and 2560x1080x24 and 2560x1080x32) but when I do that, the only choice I get in the 'Screen' object is 1600x1200x16777216. So I set back to 1920x1080x32. Kinda implies it can't be done. Is there something else I need to do to get the desired resolution? Did increase video memory to 128MB, but it made no difference.

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Neil Waldhauer

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Re: New higher-res monitor with ArcaOS on VirtualBox
« Reply #1 on: May 03, 2025, 04:37:21 pm »
I can't seem to do it here, either. I thought I had done it earlier.

I did find the neat command to enumerate my changes:

Code: [Select]
vboxmanage getextradata $YOUR_VM_NAME enumerate
The administrators guide to VirtualBox says you can set the resolution of the host to be up to the resolution of the host, but it isn't working here.

I did try this
Code: [Select]
VBoxManage setextradata global GUI/MaxGuestResolution any
Edit: I changed from
Code: [Select]
VBoxManage.exe setextradata "ArcaOS RC" "CustomVideoMode3" "3840 x 2160 x 32"to
Code: [Select]
VBoxManage.exe setextradata "ArcaOS RC" "CustomVideoMode3" "3840x2160x32"
and it does come up. However, one time I got VirtualBoxVM.exe application error: A breakpoint has been reached.
Another time, it boots at requested resolution, but it isn't working very well. The mouse gets confused, going from host to guest, and screen looks funny when I shut down.
« Last Edit: May 03, 2025, 05:28:41 pm by Neil Waldhauer »
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David McKenna

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Re: New higher-res monitor with ArcaOS on VirtualBox
« Reply #2 on: May 03, 2025, 06:12:38 pm »
 Hey Neil,

In desperation I reset to VGA, then installed Panorama, and now I can get full resolution in Virtualbox. I always run full screen (no windows), so this will be good for now. No idea what went wrong before...

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Jochen Schäfer

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Re: New higher-res monitor with ArcaOS on VirtualBox
« Reply #3 on: May 03, 2025, 06:27:27 pm »
I have succesfully run my T480 on a Cinema Display with 1440P.