Keyboard and mouse pad no response(Compaq EVO n410c notebook)

[Hsi-Ching Chao]

Hi all,
I have a problem with my notebook(Compaq EVO N410c) that running Fedora
core 1. When i'm using AC power everything is ok.
When I'm using the battery power(without AC) ,I keep my xwindow idle
about 3 minutes then the keyboard and the mouse pad is no response(but
the USB mouse still working.).What is the problem?

p.s. My English is not very well,hope you guys can understand what I'm
talking about :-)

Thanks