• ThinkCentre A51 (type 8122, 8123, 8124, 8129, 8131, 8132, 8133, 8134, 8135, 8136, 8137, 8138, 9212)
• ThinkCentre A52 (type 8327, 8340, 8343, 8381)
• ThinkCentre M51 (type 8096, 8097, 8141, 8142, 8143, 8144, 8145, 8146)
• ThinkCentre M51e (type 9213)
• ThinkCentre M52 (type 8099, 8110, 8111, 8112, 8113, 8114, 8116, 8211, 8212, 8213, 8214, 8215, 9210, 9211)
• ThinkCentre M52e (type 8299)

1. Choose the refresh rate in the ATI catalyst control center
   1. Open the ATI catalyst control center and click on resolution.
   2. Set the screen color bit quality to match your preferrence.
      Example: 70Hz, 2048x1536, 32bit.
   Or
   
2. Choose the "Forced" key in the ATI catalyst control center to allow the resolution 2048 x 1536 to be selected.

This is currently a video adapter limitation.