After googleing around I found [1]: "The `reboot=' Argument
This option controls the type of reboot that Linux will do when it resets the computer (typically via /sbin/init handling a Control-Alt- Delete). The default as of v2.0 kernels is to do a `cold' reboot (i.e. full reset, BIOS does memory check, etc.) instead of a `warm' reboot (i.e. no full reset, no memory check). It was changed to be cold by default since that tends to work on cheap/broken hardware that fails to reboot when a warm reboot is requested. To get the old behaviour (i.e. warm reboots) use reboot=w or in fact any word that starts with w will work. Other accepted options are `c', `b', `h', and `s', for cold, bios, hard, and SMP respectively. The `s' takes an optional digit to specify which CPU should handle the reboot. Options can be combined where it makes sense, i.e. reboot=b,s2" Bye Piero [1]: http://tldp.org/HOWTO/BootPrompt-HOWTO-3.html -- Slow reboot sequence https://launchpad.net/bugs/78693 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
