[arch-general] I can not login in my system with gdm after update to kernel 3.18.6

Hi all. After I upgrade to kernel 3.18.6, I was stuck at the login screen. I type the login and password, press the enter key and the login screen appears again. There are no problems with my login because I can login in the console normaly. After I downgrade to kernel 3.18.5 the problem desappears. Am I doing something wrong? Thanks. []s José Vilmar Estácio de Souza