Centering Primary Display with Scaling Encoders

In Clone mode, the Intel^® EMGD expects the primary display to have a framebuffer size (OS Aware mode) that matches the display’s native size of panel timings. When the user designates a display as primary in a Clone mode configuration and wants to center it (as explained in Alignment in Clone Mode), they may want this setup to align a primary display on a scaling encoder with a secondary one that can only center. This will not work by default for certain port encoders such as the internal LVDS, which default to hardware scaling. But Intel^® EMGD has a mechanism to override hardware scaling, thus forcing centering.

When possible, the Intel^® EMGD allows centering of 640x480, 800x600, and 1024x768 resolutions on the primary display. In some cases (depending on panels), the image may appear on the top-left. It may also produce unusable output on some displays (such as a TV). Therefore, this type of configuration is more appropriate for LVDS panels.

To disable hardware scaling and force centering for a primary display on the above modes, users only need to set the “Panel_Fit” attribute (“0x12”) to “0” (zero).