How obtain high screen resolution

[Borneq]

I have Kubuntu 11.10 under VirtualBox. Highest resolution is 1024x768, my computer has 1280x960.
After installing Guest Additions it was possible (VirtualBox 4.1.12) In this VirtualBox are problems with intersystem clipboard.
I install newest VirtualBox 4.1.14, but now Highest resolution is 1024x768.
Can I edit some config files?

[ronw]

Did you update Guest Additions inside the virtual machine?

[Borneq]

Yes. Now I try also Ubuntu 12.04 (with Unity). I install Guest Additions, restart, but no high resolutions

[SteveRiley]

How much memory did you allocate to the virtual video adapter?

[Borneq]

Standard. 12 MiB

[Borneq]

Linux detect graphical card? Virtual Box card is not the same as my physical card?

[Snowhog]

No. A virtual machine 'virtualizes' the hardware.

[SteveRiley]

Standard. 12 MiB

Probably not enough. Bump the memory allocation to at least 64 MiB.

[Borneq]

Nothing changes. Is max 1024x768
Maybe maximum resolution is in Linux config file?

[ronw]

Is the vboxvideo driver getting loaded? Check lsmod in a terminal.

Here's an xorg.conf from a Kubuntu vm that is currently at 1515x1018:

$ cat /etc/X11/xorg.conf
# VirtualBox generated configuration file
# based on /etc/X11/xorg.conf.

Section "Monitor"
Identifier "Monitor[0]"
ModelName "VirtualBox Virtual Output"
VendorName "Oracle Corporation"
EndSection

Section "Device"
BoardName "VirtualBox Graphics"
Driver "vboxvideo"
Identifier "Device[0]"
VendorName "Oracle Corporation"
EndSection

Section "Screen"
SubSection "Display"
Depth 24
EndSubSection
Device "Device[0]"
Identifier "Screen[0]"
Monitor "Monitor[0]"
EndSection

[Borneq]

Is the vboxvideo driver getting loaded? Check lsmod in a terminal.

vboxvideo driver not loaded

$ cat /etc/X11/xorg.conf

I have not this file

[ronw]

It doesn't sound like you have Guest Additions properly installed.

If you're using VirtualBox downloaded from the virtualbox repository, when you install/update GA in the vm, the script will tell you if it's successful or list any errors. I'm not sure how GA from the ubuntu repository works.

What's the output of "sudo sh .VBoxLinuxAdditions.run" after you mount the CD and change to the VBOX directory?

[Borneq]

sudo sh ./VBoxLinuxAdditions.run install GA

[Borneq]

Thanks. I think it is feature new VirtualBox. If I turn full screen (host+F), 1280x960 appear