I'm using a Windows 7 64-bit host with an ATI graphics card and a Ubuntu 11.04 Desktop guest.
- Some time after having Ubuntu 11.04 running with unity 3D (3D acceleration enabled) The desktop part of the screen enters a corrupt state and stops showing correctly. (going black not redrawing showing only parts of stuff)
VirtualBox 4.1.4 Guest Additions 4.1.4 installed Ubuntu 11.04 Up-to-date no extra packages other than the guest additions from the guest additions .iso installed. ATI Mobility Radeon HD 5470 (Driver version 11.07) Windows 7 Home Premium 64-bit Intel VT-x enabled Core i3 proccessor (4 cores cores reported, I think it's 2 hyperthreaded to 4) 1 GB ram allocated to guest 2 CPU Guest SMP 8GB .vdi - The preview in the VirtualBox main window shows a black screen when running a 3D accelerated desktop (3D acceleration on) like Unity in Ubuntu.
- The Mini-toolbar and ctrl+home menu is invisible when running full screen with a 3D accelerated desktop like Unity or Windows 7 Aero.
- EDIT: When using pause the gray out effect isn' working when running a 3D accelerated desktop (3D acceleration on) like Unity in Ubuntu.
- The Virtual Terminal in Ubuntu (host+F1, ctrl+alt+F1) display corrupt graphics.
EDIT: This seems to be caused by some incompatibility between Ubuntu's VT framebuffer and the VirtualBox graphics adapter Guest Additions module, before I installed the guest additions the VT displayed fine. - The display panel in Ubuntu only shows the current resolution and 800x600, 640-480, there is no way to set a specific resolution other than that.
Maybe adding a dialog to set a specific resolution using the resizing ability of the guest additions will offer a simple solution for this.