I want to second this post. Same sleep issue on the X17. Pressing the power->sleep button doesn’t always send the PC to sleep. Closing the lid soon after pressing the power->sleep button in windows seems to stop the laptop from going to sleep as well. Can spend more time trying to reproduce exact steps if needed but most of the time I try to send the PC to sleep it doesn’t go to sleep.

Same problem I got. When I close the lid I still hear fan running even faster than when the pc is on (or the lid is open. I got 4000 euros alienware x17 R1. Dell fix it or send me new PC !!!

 Pressing the power->sleep button doesn’t always send the PC to sleep. Closing the lid soon after pressing the power->sleep button in windows seems to stop the laptop from going to sleep as well. Can spend more time trying to reproduce exact steps if needed but most of the time I try to send the PC to sleep it doesn’t go to sleep.

Did you had same problem? I may wait a while and reset my laptop and do the steps you said. I hope that will help. 

If it helps, I just received my x17 too....for now, everything stays stock standard, no mod's yet. Even then, only 1 at a time, so I can track/trace new issues.
1) Immediately went to Dell's site, logged in, and ran "Detect my system". Let Dell site choose the order of installation for ALL drivers/firmwares.

2) Then went to Intel's site to run Intel's "Support Assist" to ensure I had all latest Intel Chipset firmware/drivers.

3) Went to Microsoft and get all updates. Perfect.
4) Upgrade to Windows11. (mine went perfect). Enable your TPM chip in Bios.

5) FINALLY - uninstall & re-install latest version of "AlienwareCommandCentre".

This worked like a charm for me. It went flawless.

I recommend Everyone try @AWX17 Solution but I also recommend doing a fresh install of windows 10. Select the option to delete everything except your important files and that should fix most if not all issues.

Just reinstall drivers after that and you're good.

Yep.  A fresh install/image is the best thing you can do for any system. Servers too.
There are just too many inherent things can remain/develop over a dozen+ updates from multiple vendors. Even the registry can end up a mess.

You also get a fantastic, deep defragmentation of the entire hard-drive partition. We're counting clock cycles now...haha:)
For what it's worth, I believe it's good practice too...go through your settings again. Become extremely familiar. I've learned after dozens of images that "as close to stock standard, is the best and most reliable and, usually the quickest.". Make changes slowly so you can track.

You can try a factory image restore (from new) and update the firmware bios first.....then the rest.

I've done the same. I even have the 1.4.0 bios update. My x15 works great. 

Hello everyone I got mine X17 solved using this method:

Type regedit to open Registry Editor.
Go to “HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power“
Double click on “CsEnabled”
Change Value data from “1″ to “0″
Click OK. Restart the computer.
Now right-click on the battery icon (system tray), click on Energy Options.

In the left menu, there's an option to "Create a New Energy Plan" (I'm using Portuguese version, so I don't know exactly how Microsoft translated that option)

Create a New Plan and rename to something you want, like "High performance" (I used that because mine had only the Balanced one). Now set to never suspend the computer when plugged to the energy. Now, when I click to suspend, all the lights go off like it should.

Hope it fixes for you guys as well.

This is not necissarily an alienware issue, as I've had desktops, and laptops (that weren't alienware) that just won't stay asleep, and even screen savers that simply won't stay on. Sometimes you just have to fiddle around to get them to work properly. This is more a windows issue, than an alienware specific problem. Putting a computer to sleep is rather pointless nowadays as boot times are near instant. You're better off just turning the machine off all together, then leave it in sleep mode, expecting it to stay off, when any number of things can kick it back on.

@WillDrivesU @Evan Wiger @CilasG @mark5693 @AWX17 

You guys tried the hard reset?

Hold the laptop power button and force shut down the laptop.

Disconnect the battery connector from the motherboard, then hold power button for 15 seconds.

Then plug battery back in.

Then turn on  laptop and try sleep mode.

All you need to do, is set the regkey and restart the laptop. There's no need to create a Energy Plan.

Just tested and it worked.

Same issue here with my x17 R1. I have to sometimes press the power button or hit sleep multiple times for it to actually go to sleep. And even after hours, the fans never stop going. If I close the lid, I can still hear the fan goings and feel the air coming out of the back of it. After a while I heard a low and steady beeping noise coming from it. When I open the laptop back up, it fails to go into Windows and I need to restart it. So sleep is completely broken. Very upsetting after having paid $3.7k for this computer. I've done AWCC uninstall and re-install and I've done a fresh Windows 10 install. Issue still happens.

Just started having this issue after messing around with RGB lighting. My Windows 10 sleep settings are properly configured but the laptop won’t go to sleep. Dell please fix!