NetworkManage cannot dial up ADSL via Wired Network

Binary package hint: yelp

Since I use ubuntu 9.10 beta, I simply cannot dial up ADSL via Wired Network with NetworkManager, it just say "Wired Network disconnected - you are offline now".
So, I just can type pppoeconf everytime I login in, and type in the account and password to get connected.
Though I update even more than twice a day, and tried many times, however it simply doesn't work.
However, when I used ubuntu 9.04, it can work properly.

ProblemType: Bug
Architecture: i386
Date: Sat Oct 10 12:32:52 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/yelp
NonfreeKernelModules: nvidia
Package: yelp 2.28.0-0ubuntu1
ProcEnviron:
 LANGUAGE=en_US.UTF-8
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-13.43-generic
SourcePackage: yelp
Uname: Linux 2.6.31-13-generic i686
XsessionErrors:
 (gnome-settings-daemon:2017): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (gnome-settings-daemon:2017): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (nautilus:2109): Eel-CRITICAL **: eel_preferences_get_boolean: assertion `preferences_is_initialized ()' failed
 (polkit-gnome-authentication-agent-1:2130): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed
 (gnome-panel:2108): Gdk-WARNING **: /build/buildd/gtk+2.0-2.18.2/gdk/x11/gdkdrawable-x11.c:952 drawable is not a pixmap or window