After the display goes to sleep, my monitor wakes up every 10 seconds to tell me there's no HDMI signal. This probably isn't Plasma's fault, but before, I was using a **** little Nvidia GT710 card, which slept just fine. I discovered that was causing my screen to freeze, so I removed it in favor of the mobo's on-board graphics, and I'm using that now. That's the only change, but for some reason, my display seems compelled to wake up every 10 seconds.

Any suggestions on what I can look for to fix this? TIA.

Exact Plasma version and distribution?