I think this is not directly related with VirtualBox, but some video driver issue.
I can confirm this starting a virtual machine, but also starting a video playback with mplayer. -- [hardy] Starting up a virtual machine in a virtualbox changes the display brightness https://bugs.launchpad.net/bugs/207676 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs