[Libreboot] X200 nvramtool not working. "No CMOS Option Table"

[Datentonne]

Hi,

i am using Libreboot + grub on a X200, everything is working fine. Except one 
thing. I wan't to disable the annoying Low-Battery-Beep and followed the guide 
described here. 
https://libreboot.org/docs/misc/#powerbeeps 

But i can't use nvramtool. The ouput is:
"nvramtool: CMOS option table not found in coreboot table. Apparently, the 
coreboot installed on this system was built without specifying 
HAVE_OPTION_TABLE."

Config from the .rom says "HAVE_OPTION_TABLE=yes"

Can anyone with a X200 confirm this or has maybe a solution for me.

Best Regards.

Herr G.


P.S.: Please forgive my English, its not my native language and i am posting on 
a Mailinglist the first time.