VB 6.00: Display in VM guests very high resolution

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VB 6.00: Display in VM guests very high resolution

Postby macandroid » 11. Jan 2019, 18:24

Using a Macbook Pro 2018 13" I used VB 5.2 without problems, but after upgrade to 6.0, the display within the VM appears to be very small: i.e. very high resolution packed on my 13" screen.
The video hardware is the same (1280x800 'retina' screen), but it appears that VirtualBox blows it up to double that size and compresses it in the screen too small for this resolution with text stoo small to be read. Changing global screen scaling does not work anyway, only within each VM individually.
But why does VB since 6.0 'blow up' my resolution to a fake 2560x1600 ?
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Re: VB 6.00: Display in VM guests very high resolution

Postby socratis » 11. Jan 2019, 21:09

macandroid wrote:But why does VB since 6.0 'blow up' my resolution to a fake 2560x1600 ?
VirtualBox does no such thing. Can't. It's you that wanted/got the Retina MacBook. The resolution is exactly what it says it is. Check your MBP specs...

macandroid wrote:The video hardware is the same (1280x800 'retina' screen)
No, that's OSX doing a 1/4th of your Retina display, your actual display is double that, both horizontally and vertically: (2560x1600)/2=(1280x800). In order for your VMs to "seem" right in terms of scaling, you got to use the Scaling factor. Either per-VM (avoid it!!!) or the Global one. VirtualBox Preferences > Display > Scale Factor: 200%.

If you set the per-VM factor, there's no way to "unset" it and follow the global one, unless you manually edit the ".vbox" file and remove the scaling factor entry (not suggested!!!) or use the following command:

    VBoxManage setextradata <uuid|vmname> "GUI/ScaleFactor"
I've created a new enhancement request to address this shortcoming, ticket #18303: No way in the GUI to reset the per-VM scale factor to follow the global one.
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Re: VB 6.00: Display in VM guests very high resolution

Postby macandroid » 12. Jan 2019, 11:39

Thanks for issuing a ticket on this. There was somebody else opening a topic on this.
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Re: VB 6.00: Display in VM guests very high resolution

Postby socratis » 12. Jan 2019, 12:24

Thanks @macandroid for reminding me about the other thread, I've added a comment to let the OP know about the ticket. If you want, you can subscribe to the ticket (by adding a simple comment) as well, if you want to see its progress.
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Do NOT reply with the "QUOTE" button, please use the "POST REPLY", at the bottom of the form.
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Re: VB 6.00: Display in VM guests very high resolution

Postby macandroid » 5. Apr 2019, 08:08

VirtualBox 6.04 still has this problem.
And setting the global setting to 200% does not help, I have to adjust it per VM (which I don't prefer).
Why cannot the way VB handles with Retina displays be set in the same way as earlier versions ? In VB 5.x it worked flawlessly.
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Re: VB 6.00: Display in VM guests very high resolution

Postby socratis » 5. Apr 2019, 08:54

macandroid wrote:And setting the global setting to 200% does not help, I have to adjust it per VM (which I don't prefer).
Read the thread again please, there's no point repeating what's 3 posts back... If you ever "touch" the per-VM scale factor, you can't untouch it, unless you get involved manually.

macandroid wrote:In VB 5.x it worked flawlessly.
Go to 5.x then. I know that this is a tongue in cheek answer, but 1) I already told you what's the strategy, 2) I have no problem at all with my VMs, which are running on HiDPI and non HiDPI computers. On multiple monitors. The same exactly VMs...
Do NOT send me Personal Messages (PMs) for troubleshooting, they are simply deleted.
Do NOT reply with the "QUOTE" button, please use the "POST REPLY", at the bottom of the form.
If you obfuscate any information requested, I will obfuscate my response. These are virtual UUIDs, not real ones.
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Re: VB 6.00: Display in VM guests very high resolution

Postby Sandeep Khanna » 12. Apr 2019, 01:48

SOLVED

Using the VirtualBox Manager GUI, select the autoscaled output option:

View -> Virtual Screen 1 -> Scale to 200% (autoscaled output)

Key is to select the autoscaled instead of the unscaled (which seems to use the crazy small retina display resolution)
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Re: VB 6.00: Display in VM guests very high resolution

Postby socratis » 12. Apr 2019, 07:55

Sandeep Khanna wrote:SOLVED
Not really...

What you did is to change the ScaleFactor for a single VM. Not the global one.
Do NOT send me Personal Messages (PMs) for troubleshooting, they are simply deleted.
Do NOT reply with the "QUOTE" button, please use the "POST REPLY", at the bottom of the form.
If you obfuscate any information requested, I will obfuscate my response. These are virtual UUIDs, not real ones.
socratis
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Posts: 27690
Joined: 22. Oct 2010, 11:03
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