In Windows 7, I go into the Control Panel and select the Always On power plan – it should never turn off the display or put the computer to sleep, but it keeps reverting to turning off the display after 20 minutes. I even tried creating my own power plan, then editing it at Control Panel\All Control Panel Items\Power Options\Edit Plan Settings – I set both values to "Never" and saved changes. When editing the plan settings a few minutes later, they were still set to "Never", but the next day, "Turn off the display" had changed to "20 minutes"! I've tried setting it back to "Never" and saving several times now, but it keeps changing back to "20 minutes" after a day or two.
I've read that one thing that commonly does this is some software called "HD Tune", but I don't have that installed. So what's causing this? Is it just some known Windows 7 bug that MS haven't fixed?
Best Answer
I ended up enabling the policy
Computer Configuration > Administrative Templates > System > Power Management > Video and Display Settings > Turn Off the Displayingpedit.mscand setting it to0, both for "plugged in" and "on battery". This seems to translate to an unchangeable "never turn off the display" in the power plan.