"when i uninstalled gdm (i no more need a login manager) i found out that Eterm doesn't print some characters correctly."
You can list the names of the files provided by the gdm package with:
rpm -ql gdm | less
Then you can try deleting these files one by one until you create the eterm error again. Once you find out which file(s) you need for eterm to work properly then you can try removing gdm and then adding only the gdm files that eterm needs.
Be prepared. Create a LifeBoat CD.