Screen Resolution Changes for No Reason: Windows 11

 Well, actually, there is always a reason!

I have a iiyama B2403WS and I noticed that whereas the display screen is ordinarily filled up entirely at 1920 x 1200 pixels, sometimes it was changing to 1600 x 1200 and I was getting unfilled pixels on the left and right hand of the screen. Perhaps this happened after going into Sleep mode. WINDOWS 11.

(Perhaps there are video drivers that mess the settings up? I need to learn more about that.)

Meanwhile, this solution worked for me:

Always take a backup of the registry before you do these steps.

1) Go to Start --> Run  -->  Regedit   and press enter

2) Click 'Edit' and click 'Find' in the Edit menu

3) Type ' DefaultSettings.XResolution ' (without quotes) and click 'Find' 

4) Now double click it and change the hexadecimal value to 780 which corresponds to 1920

5) Click 'Find Next' and repeat Step 4)

6) Now do the same for ' DefaultSettings.YResolution ' (without quotes) and change the hexadecimal value to 4b0  which corresponds to 1200 and restart the machine.

Note: There may be more than one 'DefaultSettings.YResolution' and XResolution so something else to bear in mind.

Glossary

Adapted from: https://answers.microsoft.com/en-us/windows/forum/all/resolution-changes-after-recovery-from-sleep-mode/7b87eaad-86bd-4263-adce-17cea1131a23

(Convert Decimal to hex: Source: https://calculat.io/number/dec-to-hex/1200)

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