Welcome to Yubico tech community.

Hi,
I have installed truecrypt on the whole system drive. The problem is the login. Yubikey doesn't send the whole password every time. I know about the output speed throttling. What can I do?

We would appreciate if you can use the "output speed throttling" feature of the YubiKey to slow down the character output from the YubiKey and try again. You need to use the YubiKey configuration utility to slow down the character output rate. The YubiKey configuration utility and the user guide can be downloaded from the following link:

http://www.yubico.com/developers/personalization/

Please note that you need to reprogram your YubiKey in order to slow down the character output rate.

We hope this helps!

can you give som guidance about which thottle I should use 20, 40 och 60?

You need to use trial and error method here. For most of the users slowing down character output by 20 ms solves the problem.