Have you tried doing it with the sudo followed by the command. The "| sudo gainroot" method wasn't working for me on Queen BeeCon so I used the following : sudo /usr/sbin/kernel-load /home/user/MyDocs/files/overclock900 (where overclock900 is my copied/modified file of the kernel power setting for 900Mhz).
#!/bin/sh /usr/sbin/kernel-load /usr/share/kernel-power-settings/default