Enable Scaled Resolutions in macOS

Enable Additional Scaled Resolutions in macOS

Follow these steps to enable scaled resolutions of 1536 x 864 and 1920 x 1080 on the stock X220 LCD panel.

Open the Terminal and enter this command:
```
ioreg -lw0 | grep IODisplayPrefsKey
```

The output should be something like this:

"IODisplayPrefsKey" = "IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/IGPU@2/
AppleIntelFramebuffer@0/display0/AppleBacklightDisplay-30e4-d302"

In the example above, the DisplayVendorID is 30e4 and the DisplayProductID is d302
Change these numbers in the next two steps to match your output from step 2.
.
Create an Override folder named DisplayVendorID-30e4 by entering this command in the Terminal:
```
sudo mkdir /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-30e4
```

Create a Display Override file named DisplayProductID-d302 by entering this command in the Terminal:

sudo nano /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-30e4/DisplayProductID-d302

Use the hexadecimal to decimal converter tool here to get the decimal values that correspond to your DisplayVendorID and DisplayProductID
For example:
the hex value 30e4 converts to the decimal value 12516
the hex value d302 converts to the decimal value 54018
.

Paste this code into the new file you just created. Replace the red and blue numbers with the correct decimal values you obtained in step 6:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
        <key>DisplayProductName</key>
        <string>Lenovo x220 Display</string>
        <key>DisplayVendorID</key>
        <integer>12516</integer>
        <key>DisplayProductID</key>
        <integer>54018</integer>
        <key>scale-resolutions</key>
        <array>
                <data>AAAGAAAAA2A=</data>
                <data>AAAHgAAABDg=</data>
        </array>
</dict> 
</plist>

Press <Ctrl> + <X> and then respond with Y (for Yes) and then press <Enter> to save the file and exit nano
.
Restart the computer

The scaled resolutions of 1536 x 864 and 1920 x 1080 should now show up in System Preferences > Displays

source

Enable Additional Scaled Resolutions in macOS

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