vbetool -V (return code: 1)
mmap /dev/zero: Operation not permitted
Failed to initialise LRMI (Linux Real-Mode Interface).
vbetool (return code: 1)
vbetool: Usage vbetool [[vbestate save|restore]|[vbemode set|get]|[vgamode]|[dpms on|off|standby|suspend|reduced]|[post [romfile]]|[vgastate on|off]|[vbefp panelid|panelsize|getbrightness|setbrightness|invert]]