I installed Windows 8 as a guest operation system, and I set custom resolutions with this command:
VBoxManage.exe setextradata "Win 8 dev" CustomVideoMode1 1366x768x24
After installing guest additions, it reset all resolutions to the default settings. Even after executing
VBoxManage setextradata global GUI/MaxGuestResolution any
it shows only 4:3 related resolutions in display properties, but I need 1366:768 (which is 16:9 related).
I also tried
VBoxManage controlvm "Win 8 dev" setvideomodehint 1366 768 24
but nothing happened even after guest system reboot.
The resolution appeared (somehow) in the resolutions list after I removed guest additions and installed them again.
But I still need to set the 1920x1080 resolution to the second monitor. Can anyone told me pls, how to do it?