01-27-2018, 08:34 AM
The old ATI video card is your problem. It does not support HDMI, only DVI/VGA, any resolution on the TV above what the card supports is created by the TV's own upscaling system when run through HDMI, there is also the DVI to HDMI conversion sat in the middle of it, that can bring its own problems.
Also support for those old cards within recent Linux kernels is basic at best, the reason you get better support through XP is because it's running drivers designed for that card. Either run the TV through the VGA port where better support exists, or you will have to upgrade the video card. A suitable card for that job can be found for the price of a pizza these days on eBay and other sites.
I do a lot of work with old retro computing stuff and my big flat screen TV is what I use also to install and set them up when in the living room. I always use VGA because HDMI never works properly with old video cards, it either upscales incorrectly or has some sort of problem or artifacts.
You may get it to run better by editing the Xorg configuration files but I doubt it, you still will have the upscaling quirks to deal with.
Also support for those old cards within recent Linux kernels is basic at best, the reason you get better support through XP is because it's running drivers designed for that card. Either run the TV through the VGA port where better support exists, or you will have to upgrade the video card. A suitable card for that job can be found for the price of a pizza these days on eBay and other sites.
I do a lot of work with old retro computing stuff and my big flat screen TV is what I use also to install and set them up when in the living room. I always use VGA because HDMI never works properly with old video cards, it either upscales incorrectly or has some sort of problem or artifacts.
You may get it to run better by editing the Xorg configuration files but I doubt it, you still will have the upscaling quirks to deal with.