lightdm: ssh / rdesktop / no enription

[Valerio Pachera]

Hi all, I wish ltsp client to NOT use encryption to lower the cpu usage.

I read
http://manpages.ubuntu.com/manpages/lucid/man5/lts.conf.5.html
it's possible to do that by the option LDM_DIRECTX to set in the file
/var/lib/tftpboot/ltsp/i386/lts.conf
1) How can I check and see it the ltsp client is realy not using encription?

I noticed in edubuntu 11.10 is possible to select "rdesktop" or "ssh"
like backend.
2) I have no clear if that has anything to do with the LDM_DIRECTX.
May you tell me more about rdesktop and ssh choise?

By the way, choosing rdesktop the client fails to log in.