Windows 7 + ATI + Stuttering Output

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.