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How can the DPI setting be changed for the Logon Screen in Windows 8.1?

Microsoft has added per-user DPI settings. But this means that there is no adjustable DPI setting for the Lock/Logon screen.

You can change the DPI setting to be the same across all displays and this does affect the icons and font on the lock/logon screen. However, it does not affect any app/program that can run on the lock/logon screen.

Ex.
I use a 44" flat screen TV for my monitor on my desktop. Big enough for me to sit in my recliner and use my computer. I use the on-screen keyboard most of the time. (I don't want to keep a keyboard next to me.)

The problem is that with the new DPI setup the on-screen keyboard takes up nearly half the screen, which is too big.

I tried looking through the registry to see if I could find a setting for it. In the key HKEY_USERS\.DEFAULT\Control Panel\Desktop there is a string value named LogicalDPIOverride with a value of -1. I have a feeling this is where I can fix the issue. I tried changing the value to 0 and to 1 with no change in the result. Instead I noticed that after logging out and back in the -1 value was back in the registry.

How can I change this default DPI? Can I use the LogPixels string that worked for DPI in Windows 7?

Here are two Screen shots, one of the Lock Screen and one of the Logon Screen:

lock screen screenshot

logon screen screenshot

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The on screen keyboard is exactly the same size in both of these screenshots. So there's no problem demonstrated here! – Michael Hampton Nov 4 '13 at 23:58
    
I guess the keyboard should be smaller? It takes up half the screen and it should be a different size. – Kevin Panko Nov 4 '13 at 23:59
    
The screens are to show you the auto scaling when I'm logging in. I was hoping to find a way to turn off auto scaling for the logon desktop. It isn't affected by the settings from accounts. The new per-user settings Microsoft has implemented make it so no account can change logon. – jmc302005 Nov 5 '13 at 0:33
    
Also it says right in my question it is too big. – jmc302005 Nov 5 '13 at 0:34

In order for LogicalDPIOverride to work you need to set value larger than 1.

For example on Macs with retina screen you'd need to set it to 2 - which will result in 200% UI scaling.

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