May 13 00:00:03 lothlorien gdm[10496]: WARNING: Couldn't authenticate user
May 13 00:00:34 lothlorien last message repeated 10 times
And lines like this in auth.log:
May 13 00:01:14 lothlorien gdm[10496]: pam_unix(gdm:auth): check pass; user unknown
May 13 00:01:14 lothlorien gdm[10496]: pam_unix(gdm:auth): authentication failure; logname= uid=0 euid=0 tty=:0 ruser= rhost=
I think it's a pretty safe assumption that this issue is with GDM. I've managed a really nasty workaround, because I hate logging out, I disabled aplay until this gets resolved:
In syslog I get messages like this:
May 13 00:00:03 lothlorien gdm[10496]: WARNING: Couldn't authenticate user
May 13 00:00:34 lothlorien last message repeated 10 times
And lines like this in auth.log:
May 13 00:01:14 lothlorien gdm[10496]: pam_unix(gdm:auth): check pass; user unknown
May 13 00:01:14 lothlorien gdm[10496]: pam_unix(gdm:auth): authentication failure; logname= uid=0 euid=0 tty=:0 ruser= rhost=
I think it's a pretty safe assumption that this issue is with GDM. I've managed a really nasty workaround, because I hate logging out, I disabled aplay until this gets resolved:
$ sudo chmod -x /usr/bin/aplay