After running PowerCfg /q and reviewing this page, I believe I have determined the solution to this problem.

There appear to be many power settings that just don't show up in my advanced power options window. One is Sleep → System unattended sleep timeout. To make it visible, I opened regedit.exe and found this key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\238C9FA8-0AAD-41ED-83F4-97BE242C8F20\7bc4a2f9-d8fc-4469-b07b-33eb785aaca0

Set its Attributes DWORD value to 2. This will make it show up in your advanced settings. Go there and configure it to be zero minutes if you don't want it to sleep when you lock your screen.

The display timeout on the lock screen is under Console lock display off timeout in Power Options advanced settings. The setting is hidden by default and can be enabled in the registry.

Open the Registry Editor by clicking start and type regedit.

Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Power\PowerSettings\7516b95f-f776-4464-8c53-06167f40cc99\8EC4B3A5-6868-48c2-BE75-4F3044BE88A7. Double-click Attributes and change the value data from 1 to 2.

Click start and type edit power plan, open it then click Change advanced power settings.

Expand Display then you should be able to see the Console lock display off time-out setting.

Change this to whatever suits you. 0 for never.

You can download and run this little program: No Sleep

Get it from here

No Sleep - Cnet

No Sleep - Apponic

It moves your mouse once a minute by one pixel. Thus it prevents your windows from going to sleep mode.

The issue is most likely with the graphics driver. Whenever a single monitor is disconnected from a multimonitor setup in Windows, Windows will attempt to move everything from that screen onto the remaining screen(s). Usually, this will not occur when suspending/hibernating/shutting down the computer. Thus, it is probably because of the graphics driver doing one of the following:

• 'Disconnecting' the monitors when you put the computer to sleep, so when Windows awakens, it must re-determine where to place everything.
• Recognizing the monitors in a different order each time you bring the computer out of sleep, forcing Windows to rearrange your application windows.

Check to see if there is an update to your graphics driver by going to the chipset manufacturer's website.