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Date: Thu, 6 Oct 2016 11:03:58 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Malcolm Matalka <mmatalka@gmail.com>
cc: freebsd-questions@freebsd.org
Subject: Re: FreeBSD VBox Guest does not run X11 at 1440x900
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On Thu, 6 Oct 2016, Malcolm Matalka wrote:

> Hello,
>
> I am running FreeBSD as a virtualbox guest on a OS X.  My Mac is set to
> resolution 1440x900 and my X11 config in the VM is set to this as well.
> After running freebsd-update fetch and install and upgrading all my
> packages I cannot seem to run X in VBox at that resolution.  If I bring
> my Mac to 1680x1050, I can run that (but it's not super enjoyable due to
> some poor redraw latency).  And I can run at 1080x1024.  I tried
> 1400x1050, which did not work as well.
>
> What happens when I try to run at 1440x900 is that the screen is only
> roughly the size of the console window.  It is running X, I can do all
> my stuff but the screen is small.  xrandr claims it is running at
> 1440x900.
>
> Has anyone seen this?  I feel like the resolution might be a red herring
> but I have no way to determine this.

Install the VirtualBox Guest Additions 
(emulators/virtualbox-ose-additions) inside the VM.  Then use what it 
provides as an X driver, which should be automatic.