您好,您可以重新安装下电源管理驱动试试看。
输入主机编号进行驱动下载,注意匹配正确的操作系统
Think驱动下载:
http://think.lenovo.com.cn/support/driver/defaultpage.aspx
到联想官网下载个电源管理的驱动http://think.lenovo.com.cn/support/driver/detail.aspx?DEditid=4196&docTypeID=DOC_TYPE_DRIVER&osid=231&treeid=9518&args=%3Fyt%3Dpt%26categoryid%3D9518%26CODEName%3DThinkPadE40%26SearchType%3D0%26wherePage%3D2
和电源管理的软件http://think.lenovo.com.cn/support/driver/detail.aspx?DEditid=4716&docTypeID=DOC_TYPE_DRIVER&osid=231&treeid=9518&args=%3Fyt%3Dpt%26categoryid%3D9518%26CODEName%3DThinkPadE40%26SearchType%3D0%26wherePage%3D2
和热键http://think.lenovo.com.cn/support/driver/detail.aspx?DEditid=4814&docTypeID=DOC_TYPE_DRIVER&osid=231&treeid=9518&args=%3Fyt%3Dpt%26categoryid%3D9518%26CODEName%3DThinkPadE40%26SearchType%3D0%26wherePage%3D2
要去联想网址下载安装 原装驱动 就可以用了
你做的什么系统?XP还是WIN7?