12.04: uname -a
Linux hostname 3.2.0-33-generic-pae #52-Ubuntu SMP Thu Oct 18 16:39:21 UTC 2012 i686 athlon i386 GNU/Linux
机器是hp g4 ax 1312ax，刚安装时是正常的，某次升级后就没法关机了，直到现在还没恢复。
按电源键会弹出关机菜单，选择其中的关机无法断电。屏幕显示now will halt（使用的是 halt -d -f -i -p -h），就是不断电。
选择面板右上角里的关机也无法断电。
poeweroff、init 0无法断电。
reboot，init 6无法重启。
代码:
ls /etc/init.d/
acpid kerneloops saned
acpi-support killprocs screen-cleanup
alsa-restore landscape-client sendsigs
alsa-store libvirt-bin setvtrgb
anacron lightdm single
apache2 lighttpd skeleton
apparmor modemmanager smbd
apport module-init-tools speech-dispatcher
atd networking ssh
atieventsd network-interface stop-bootlogd
avahi-daemon network-interface-container stop-bootlogd-single
binfmt-support network-interface-security sudo
bluetooth network-manager sysstat
bootlogd nmbd udev
brltty ondemand udev-fallback-graphics
cgroup-lite passwd udev-finish
console-setup plymouth udevmonitor
cron plymouth-log udevtrigger
cups plymouth-splash ufw
dbus plymouth-stop uml-utilities
dictd plymouth-upstart-bridge umountfs
dmesg pppd-dns umountnfs.sh
dns-clean procps umountroot
dnsmasq pulseaudio unattended-upgrades
ebtables qemu-kvm urandom
failsafe-x rc virtualbox
friendly-recovery rc.local virtualbox-guest-utils
gpm rcS vmware
grub-common README vmware-USBArbitrator
halt reboot vmware-workstation-server
hostapd resolvconf vsftpd
hostname rfkill-restore whoopsie
hwclock rfkill-store winbind
hwclock-save rsync x11-common
irqbalance rsyslog
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切换网络连接时，断开A的连接，连接B。结果提示A连接成功。实际上是B连接成功了。
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