Display resolution changed after install VirtualBox Guest Additions

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Display resolution changed after install VirtualBox Guest Additions

Postby msprivat » 21. May 2022, 14:44

Hallo,

Host system: Linux Mint 20.3
Guest system: Windows 10 v.21H2
CPU: AMD Ryzen 7 2700X

Problem:
Before installation of the VirtualBox Guest Additions I can scale 1600 x 1200.
After installation only the maximum resolution is 1024 x 768.

My two screens supports:
First screen 2560x1440~60Hz, 2nd screen: 1920x1200~60Hz

Extension Pack has the same version number as the VirtualBox .

How can I fix the problem to have a higher resolution? :)

Best regards
Michael
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Re: Display resolution changed after install VirtualBox Guest Additions

Postby mpack » 21. May 2022, 16:23

msprivat wrote:How can I fix the problem to have a higher resolution? :)

Choose the display size you want from the VM menu: View|Virtual screen 1|Resize to www x hhh.
msprivat wrote:Hallo,

msprivat wrote:My two screens supports:

A VM uses virtual hardware, it doesn't much care about the capabilities of the host.
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Re: Display resolution changed after install VirtualBox Guest Additions

Postby msprivat » 21. May 2022, 18:44

Hallo,

the guest system Windows 10 is opened.
In the menu I select View -> Resize to 1920x1200.

Nothing happened. Even I can not change the resolution in the guest system?

Best regards
Michael
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Re: Display resolution changed after install VirtualBox Guest Additions

Postby BillG » 22. May 2022, 07:45

That is odd. Will it resize if you drag a corner of the window? Will it go to full screen if you select that option from the View tab?
Bill
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Re: Display resolution changed after install VirtualBox Guest Additions

Postby mpack » 22. May 2022, 09:09

msprivat wrote:In the menu I select View -> Resize to 1920x1200.

Nothing happened.

In that case we will require a VM log. Make sure the VM is fully shut down, then right click it in the manager UI. Select "Show Log" and save "VBox.log" (no other file) to a zip file. Attach the zip here.
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Re: Display resolution changed after install VirtualBox Guest Additions

Postby msprivat » 23. May 2022, 19:01

Will it resize if you drag a corner of the window? Will it go to full screen if you select that option from the View tab?
Yes it go to full screen and it will also resize, but the resolution is still the same. Eyerything gets bigger, but that's it.

I attached the log.

Hopefully that helps to solve the problem. :)

Best regards
Michael
Attachments
Windows 10_21H2-2022-05-23-18-50-19.log.zip
Log from today
(40.08 KiB) Downloaded 3 times
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Re: Display resolution changed after install VirtualBox Guest Additions

Postby scottgus1 » 23. May 2022, 19:10

msprivat wrote:Eyerything gets bigger, but that's it.

Are you in Scaled Mode? Try Host-Key + C
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Re: Display resolution changed after install VirtualBox Guest Additions

Postby fth0 » 23. May 2022, 19:51

The problem could somehow be related to the fact that the smaller right monitor is enumerated as screen 0 and the larger left monitor is enumerated as screen 1, but that's just a guess.

Does the problem depend on which monitor is used to display the VM window? When experimenting, set the resolution to 1024x768, move the VM window to one of the monitors, shut down the VM from within the Windows guest OS, restart the VM and try to change the resolution.

For each test run, provide the VBox.log file and describe exactly what you did when. Please also provide the Windows 10_21H2.vbox file.
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Re: Display resolution changed after install VirtualBox Guest Additions

Postby msprivat » 23. May 2022, 20:19

I have solved that issue.
In Guest settings (Windows) -> System -> Acceleration
Paravirtualization Interface: Hyper-V
Hardware Virtualization: Enable Nested Paging

Now it works perfect
Thanks to all

Best regards
Michael :D
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Re: Display resolution changed after install VirtualBox Guest Additions

Postby fth0 » 23. May 2022, 21:13

That doesn't sound plausible, because according to the Windows 10_21H2-2022-05-23-18-50-19.log file, the paravirtualization provider was effectively Hyper-V, which means it was configured as either Default or Hyper-V already, which both should have the same effect. Can you switch back and reproduce your problem?
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Re: Display resolution changed after install VirtualBox Guest Additions

Postby msprivat » 27. May 2022, 00:38

Unfortunately I can not reproduce it. If I switch to default it still works.
I do not want to reinstall the guest system again.

Best regards
Michael
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Re: Display resolution changed after install VirtualBox Guest Additions

Postby fth0 » 27. May 2022, 09:51

msprivat wrote:If I switch to default it still works.

Thanks for the feedback, that's enough for me. :)
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