OpenSUSE Monitor Resolution in VirtualBox

I decided to load up OpenSUSE in VirtualBox because I haven't looked at it for a while.

After I installed it, it defaulted to 800x600 resolution. When I tried to change the resolution, I was unable to. Whatever setting I picked would appear briefly, then the screen would hop back to 800x600.

However, when I changed the VB "display" setting for the OpenSUSE VM from the default to VBoxSVGA, I was able to successfully change the resolution to something more reasonable.

For reference, I have openSUSE Leap 15.2 running as VB guest (using VMSVGA adapter)....

~> inxi -Gxx
Graphics:  Device-1: VMware SVGA II Adapter driver: vmwgfx v: 2.18.0.0 bus ID: 00:02.0 chip ID: 15ad:0405 
           Display: x11 server: X.Org 1.20.3 compositor: kwin_x11 driver: vmware unloaded: fbdev,modesetting,vesa 
           resolution: 1920x1080~60Hz s-dpi: 96 
           OpenGL: renderer: llvmpipe (LLVM 9.0.1 256 bits) v: 3.3 Mesa 19.3.4 compat-v: 3.1 direct render: Yes 
~> xrandr
Screen 0: minimum 1 x 1, current 1920 x 1080, maximum 8192 x 8192
Virtual1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 0mm x 0mm
   1920x1080_60.00  59.96 +
   1920x1080     60.00*+
   2560x1600     59.99  
   1920x1440     60.00  
   1856x1392     60.00  
   1792x1344     60.00  
   1920x1200     59.88  
   1600x1200     60.00  
   1680x1050     59.95  
   1400x1050     59.98  
   1280x1024     60.02  
   1440x900      59.89  
   1280x960      60.00  
   1360x768      60.02  
   1280x800      59.81  
   1152x864      75.00  
   1280x768      59.87  
   1024x768      60.00  
   800x600       60.32  
   640x480       59.94  
Virtual2 disconnected (normal left inverted right x axis y axis)
Virtual3 disconnected (normal left inverted right x axis y axis)
Virtual4 disconnected (normal left inverted right x axis y axis)
Virtual5 disconnected (normal left inverted right x axis y axis)
Virtual6 disconnected (normal left inverted right x axis y axis)
Virtual7 disconnected (normal left inverted right x axis y axis)
Virtual8 disconnected (normal left inverted right x axis y axis)
~>

The VBoxSVGA graphics controller (set on the host) seems to work equally as well...

~> inxi -Gxx
Graphics:  Device-1: InnoTek Systemberatung VirtualBox Graphics Adapter vendor: VMware driver: vboxvideo v: 6.0.22 r137980 
           bus ID: 00:02.0 chip ID: 80ee:beef 
           Display: x11 server: X.Org 1.20.3 compositor: kwin_x11 driver: modesetting unloaded: fbdev,vesa 
           alternate: vboxvideo resolution: 1920x1080~60Hz s-dpi: 96 
           OpenGL: renderer: llvmpipe (LLVM 9.0.1 256 bits) v: 3.3 Mesa 19.3.4 compat-v: 3.1 direct render: Yes

The Xorg 'modesetting' driver is in use here.