Thanks for your question. For ASIC miners, Awesome Miner can only show the Mining Uptime. This is the time the mining process has been running, but it isn't the same as the operating system uptime. If Cgminer process on the ASIC miner is restarted, the Mining Uptime will reset although the system didn't reboot.

The Information Column has support for two kinds of uptime, the Mining Uptime and the System Uptime (OS uptime). For your ASIC miner, only Mining Uptime is supported. For Managed Miners, we can show both the Mining Uptime and also the System Uptime.