Fixing the ATI HDMI Overscan Underscan Problem

Works for Windows 7,  Windows 8, Windows 8.1 and Windows 10.

To fix your display:

Write down the resolution and display frequency your currently running at

  1. Start -> Run -> regedit
  2. Goto HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video
  3. Select the subkey that represents the video card you are currently using.

For an example on my machine there were 3 sub keys under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video . We’re looking for the key that contains  sub keys named 0000,1111 and video. The sub key with the ton of entries is the folder you want to be working with.

In my example {DD0F636C-AA03-420D-B43A-B3EC8A0BCA11}registy

  1. Backup the 0000 and 1111 keys.
  2. Select the 0000 sub key and search for your HDMIs resolution. In my example its 1920×1080.

So search for the entry DALR6 DFP1920x1080x0x59


  1. Edit the key that matches your resolution and change everything to zeroes.



  1. Click Ok and then edit the corresponding key in the 0001 sub key. Change that one to all zeros as well.
  2. Go back to your desktop and change your monitor resolution and then change it back to 1920×1080

The underscan should be gone now! Can confirm that this works with Radeon HD mobile 4200 video cards.

12 Replies to “Fixing the ATI HDMI Overscan Underscan Problem”

  1. Thank you so much! I am currently using on-board video (ATI Radeon HD 3200 Graphics). No updated drivers for Windows 10, and Catalyst Control Software won’t install to set it through software.

  2. Thank you very much for this solution! Worked for me on a ATI Mobility Radeon HD 4670 in a Dell Studio XPS 16, connected via HDMI to a Philips LED-Tv

  3. Did not work for me, as i don’t have such folder. Image is still overscaled. The only folder which name contains my resolution is: 001DAL2_DATA__2_0DisplayPath_9MODE_1920_1200_60p_Explicit, which contains a reg binary called default, with value 64.

    gfx: r9 280x
    os: win10 x64
    display: viewsonic vx2835wm, 1920×1200 resolution @60hz, hdmi cable

  4. Thanks so much, a life saver.
    I just wanted to add some further detail from my personal experience.
    Byte 0x24 of this data controlled the amount of overscan for me. A value of 0 gave the largest desktop size, and larger values decreased the size of the desktop.

  5. Thank you, this worked for me on a Radeon HD Mobile 4670 in a Dell Studio XPS on WIndows 10.

    1. By the way, I’m using a motherboard Asus M4A785TD-V EVO which has an ATI Radeon HD 4200 with windows 8.

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