auto resume from standby

Question

Can a Ubuntu (or any other distro) wake up from standby/hibernate at a preset time?

I actually don't want the PC to consume 200W all the time for just doing something every hour.

Answer 1

rtcwake is a standard Linux command that enters a standby or sleep state until the specified time. It depends on BIOS support; most current PCs do support it. You can specify either a sleep duration (in seconds) or a wake up date (in seconds since the epoch, as produced by date +%s).

rtcwake -s 3600
rtcwake -t $(date +%s 'now + 1 hour')