A matching hint may be sent to the graphics device).
Every time the host sends a hint there will be a matching entry in the machine log file on the host ("VMMDev: SetVideoModeHint: Got a video mode hint (.)" VMMDev is the "guest" device.If you are using the normal user interface, you can check that the menu option to enable dynamic resizing can be enabled (meaning the Additions provide that support) and is enabled. The first requirement for dynamic resizing to work is for the Guest Additions to support it.The short summary is that the host sends "size hints" to the virtual machine (which consist of an interrupt on the virtual graphics card or the "guest" device and a way for the guest to ask for the details) and special "driver" modules from the Guest Additions ask the guest operating system to resize its virtual displays to match the hints. The basic mechanisms of dynamic resizing are described on another wiki page.Investigating problems with dynamic resizing Feedback about this page and suggestions for improvements welcome on the vbox-dev mailing list!
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