Screen resolution during Guest OS install

[afcwc]

I have successfully loaded VB on an embedded system with host CentOS 7. I have followed the instructions from various sources and the Guest Additions ISO is in the install folder and I have tried to mount it but I'm not sure if this is my problem since the guest OS is not loaded yet. The default screen size is 800x600 and all the resize options are grayed out. Per CH4 instructions the guest additions needed to be loaded within the guest OS.

Question: Is there a way to resize the initial VM session when there is no guest OS loaded, and I'm going through the OS install process? To clarify I create a brand new VM, start it and it comes up with fatal error no OS found message. That screen is 800x600, is there a way to make it full screen and bigger without messing with the scale?

Thanks

[mpack]

You are asking the wrong people. VirtualBox doesn't actually care what software is running in a VM - the guest OS or the guest OS installer, they are both just code. Better to ask if the installer code supports more than one display resolution.

[afcwc]

My apologies, i stated VM meaning its a virtual machine not related to VMware at all if that is what you are thinking.

The guest OS is a RHEL distro, which I'm not sure how that relates to the supported screen resolution.

Question is still how do I change the resolution of the install session for the guest.

[mpack]

Uh, no, I wasn't thinking about VMWare at all. I don't even see where VMWare was mentioned, before you mentioned it.

What I was thinking was what I wrote.

[afcwc]

If i understand your original post you are saying I need to contact RH to ask if their RHEL iso supports more than one display, but that is not my issue. I know the installed supports higher resolution than what the VirtualBox guest display is showing so I ask again how can I make the screen larger?

[mpack]

Drag the window border? Use a command in the guest that selects the higher resolution?

Even before the GAs are installed VirtualBox will be using the default VESA graphics card. This is all that e.g. Win98 users have, so I know for a fact that display size will change if the guest requests it.

Any guest OS (and the bootable installer qualifies) that starts up can query the graphics card and monitor for what display modes are supported, and the guest OS (not VirtualBox) decides which one to use. If you think that VirtualBox isn't offering all available video modes then in the GUI you can set File|Preferences|Display|Maximum_Guest_Screen_Size to None.

[mpack]

Incidentally, cross posting is against the forum rules, so I deleted the other post you made "for increased visibility".

I am also moving this topic to "Linux Guests".

[afcwc]

Drag the window border? Use a command in the guest that selects the higher resolution?

Even before the GAs are installed VirtualBox will be using the default VESA graphics card. This is all that e.g. Win98 users have, so I know for a fact that display size will change if the guest requests it.

Any guest OS (and the bootable installer qualifies) that starts up can query the graphics card and monitor for what display modes are supported, and the guest OS (not VirtualBox) decides which one to use. If you think that VirtualBox isn't offering all available video modes then in the GUI you can set File|Preferences|Display|Maximum_Guest_Screen_Size to None.

Dragging the window border does now change the resolution and the under Menu>View>Virtual Screen 1 all the options to resize are grayed out.

The command to Auto-resize is also grayed out.

What I don't understand is why the guest OS is not getting the right resolution if it is in fact querying the graphics card, If i natively install it on the host system the size is much larger than 640x480. I have changed the options for Maximum_Guest_Screen_Size from None to HINT to Auto and it makes no difference at all, it is stuck on the same size every time.

I will just install the OS using the smaller screen size and hope that once the software is loaded it picks up the higher resolution since loading the Guest Additions does not work while installing.

Thanks for the input.