how do I turn off the autolock in windows 8?

Sadly, that doesn't work for me. W8.1 (domain joined) is still locking after around 15 minutes, even after the following:

• Display timeout is set to never, on both battery and plugged in;
• Screen saver is set to nothing, greyed out timer set to 120 minutes, checkbox is unchecked (req. password)

Through policy (defined, not just 'not configured':

• Require password when waking from sleep, on battery: disabled
• Require password when waking from sleep, plugged in: disabled
• Screen saver is disabled
• Screen saver timeout is set to 0 (screen saver is never started)

I'm running an Atom-based Server 2008R2 with SP1, and have W8.1 clients. Neither have the 'reset security policies' button in User Accounts, and they all have the option to select 'require password at lock screen' button greyed out (cannot change, because 'a system admin is managing these settings').

So, in short: none of the above options work for me, they're either not there or seem to have no effect at all.

This is getting so infuriating, up to the point where I'm actually considering dropping these machines and getting Macs, even though I thoroughly hate MacOS, and I've actually worked at Microsoft's Premier Support for nearly 3 years.

TLDR;

• go onto your display settings (winkey+I, personalisation, display)
• down the side, click 'adjust brightness'
• go onto whichever power plan yours is on (not power saver, 'cause that'll autolock for the greater good)
• 'change plan settings'
• turn it all to never (turn off display: never, put the computer to sleep: never, on both battery and plugged in)

Sorted :)

Found a fix, under User Accounts, clicking reset security policies seems to have fixed the issue. Also, it fixed the issue of not being able to change the screensaver timeout. I haven't been able to track down the specific policy caused the problem in the first place, but this works for now.

You know, I had this problem for over two years, both with windows 8 and 8.1... I tried everything except resetting security policies. Finally, I timed my windows and it actually didn't shut off for three minutes. 

Almost every Microsoft staff on here wants me to go and change up the command promts, safe boot, and even resetting my computer, when it all came down to a single button in the User Accounts on Control Panel. You don't know how happy this makes me feel.

Still, we dont exactly know what caused this, and how we could prevent it (prevention is better than a cure, as many of us would know), but a fix is a fix. And thanks

In Windows Registry Editor - WIN+R => regedit

change the following keys. This will disable auto lock.

[HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Control Panel\Desktop]

"ScreenSaveActive"="0"

"ScreenSaveTimeOut"="9900"

"ScreenSaverIsSecure"="0"