Our engineering team is working to correct some problems with custom resolutions, I hope next driver releases will have a fix for it. At this stage, this has been reported to engineering level.
Holy moly, sounds like you need a newer TV!
In the meantime, the CUI/OS page will not list lower resolutions like 640x480.
For OS – Try using the 'List All Modes' page to find these lower resolutions.
- Right click on Desktop -> click ‘Screen Resolution’
- Click ‘Advanced Settings’
- Under Adapter tab, there will be a button ‘List All Modes’.
Thanks, Bryce. I tried that already. I found 640x480 there, but it was progressive, not interlaced. When I set it to interlaced, it flipped the resolution back to 1080 :-(