Windows 7 + ATI + Stuttering Output

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This applies to Windows 7 and MXWendler version 5.0+ and with ATI/AMD graphics

Problem:

  • You have an output window that fits exactly the output device and video output is stuttering:

Test:

  • Create output window without window decoration and exact position and size of secondary output
  • Open MXW, play video. The video out stutters when playing video.

Solution:

  • Create a display group using the Catalyst Control Center
  • Display group must contain primary and secondary monitor

OR

  • Make output window eg. 1 pixel larger than needed, eg. 1921x1080 for Full HD

Background:

  • ATI/AMD interprets accelerated fullscreen windows as games and changes the display swap timing to achieve minimal latency times which are important for games. This cannot be turned off separately.


Comment:

  • NVidia systems may be affected, too.
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