In bug 31877 we are disabling the pam_console module by default, that is, pam_console is not used anymore to set the permissions on /dev nodes automatically at login, instead we just rely on appropriate group permissions on the devices. In fact, newer versions of pam do not compile the pam_console module by default anymore, so this change is already in effect now. To complete the job, and for cleanness, you should remove the references to pam_console.so in x11-misc/wdm/files/wdm* Thanks.
done... thanks for the heads up