Get custom resolution string: ~]$ cvt 1600 900 Install Virtualbox -> Devices, Insert Guest Additions CD image ~]# cd ~]#. Virtualbox: Oracle VM VirtualBox Manager 4.3.10_Ubuntu I had the same problems with different setup:
Going beyond that is mostly useful if you use 3D. 8MB will give you up to 1600x1200 in 32 colors. There's a limit to how high you can get, due to the amount of memory you've allocated to the graphics adapter in the VirtualBox configuration. If you find that you still need manual tweaking of your nf, the manual has some pointers. Log out, restart the X server (send Ctrl+Alt+Backspace from the VirtualBox menu), and you should have a screen resolution that matches your VirtualBox window. Insert the guest additions CD from the VirtualBox device menu, then run the installation program. The guest additions include a driver for that adapter.
VirtualBox emulates a graphics adapter that is specific to VirtualBox, it does not emulate a previously existing hardware component like most other subsystems. SVGA is the highest resolution for which there is standard support beyond that, you need a driver. A maximum resolution of 800圆00 suggests that your X server inside the virtual machine is using the SVGA driver.
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