system sleeping

[Zhu Sha Zang]

My 9-CURRENT system are sleeping randomly and i can't see any error in
logs. There are a related bug with ACPI? And, sleeping include don't
answer any tcp/ip connection like ssh or the simple work that i've
installed he: a gateway. But, if someone touch the keyboard, everything
"wake up" again.

The system are installed over a old AMD Semprom (x86) machine.

Thanks