Reference: http://www.thinkwiki.org/wiki/LCD_Brightness
Full brightness
echo 100 > /proc/acpi/video/VID1/LCD0/brightness
Totally Dim
echo 20 > /proc/acpi/video/VID1/LCD0/brightness
Note: brightness value must be in this set [20, 30, 40, ... 100]
Reference from vim-cmd of VMware ESX Server 3i 3.5.0 build-123629
Get help: vim-cmd help or vim-cmd -h
Guest VM control command
Commands available under vmsvc/: acquiremksticket get.configoption power.off connect get.datastores power.on convert.toTemplate get.disabledmethods power.reboot convert.toVm get.environment power.reset createdummyvm get.filelayout power.shutdown