Quadro 4500 - most resolutions available only as interlaced

[alphaTEK]

Got an odd one here, my Power Mac G5 running Leopard is only showing interlaced versions of most resolutions. 720 and 1080 are available as full progressive though, and I need the rest as progressive too.

I'm at a loss as to what might be causing this. Are there Nvidia-official drivers available with a software control panel for the Quadro 4500?

 

[alphaTEK]

I've fixed the issue. There's an app called SwitchResX which enables additional display options and customisations, including custom resolutions. Legacy version 4.3.6 works with OS X 10.5.

I believe the option that fixed this issue for me was "Disable HDMI 1.3a" in the screenshot above. After rebooting, all the resolutions that were interlaced before are now progressive.

This also carries over to applications, so Zoo Tycoon 2 and Halo are now looking a lot sharper.