The original poster claims they have nothing hooked up other than the one monitor. If a TV was also hooked up it would cause that issue which is why I asked if anything else is hooked up. As for NVIDIA, there are post all over the Internet when it comes to video issues in Linux, the majority have NVIDIA as their GPU. Even Linus Torvalds has nothing good to say about NVIDIA. What else could it be then?Hmm... I wonder if it's an issue with the TV. I've seen similar before with TVs, especially with refresh rates.
As for the person above insisting it's an Nvidia thing, I (and millions of others) use Nvidia hardware with nary a bump in the road.
I've hooked a computer up to a TV numerous times and have had success, but I've seen others have horrible issues on sites like AskUbuntu.
It might be worth visiting the Ubuntu specialists on one of the official Ubuntu support channels. The list of things I don't know is stunningly large.
To be clear, I have one screen connected to my machine, Idk if it's a TV or a monitor.They're hooked up to a TV, trying to use it as a monitor.
arandr might be easier to use for OP, it's a front-end for xrandr. AFAIK changing the settings under Settings -> Display -> Resolution does the same thing.You can *try* xrandr and play around with it until you get a setting you like. It can be used to set custom resolutions. There are a ton of pages out there describing it.
I didn't realize OP needed a custom resolution but no arandr doesn't offer custom resolutions but the same options as what you find under displaying settings. Most of the them the offered resolutions under display settings there is at least one that works for your screen.I don't know if arandr allows setting custom resolutions? The reason I suggested xrandr is that they can use cvt and generate custom resolutions. (Resolutions that aren't available under Settings > Display > whatever.)
Lemme dig out a link.
I tried to use xrandr to set 1680x1050 as a new mode to VGA output, but it says: sudo xrandr --addmode VGA-0 1680 X Error of failed request: BadMatch (invalid parameter attributes) Major opcode ofaskubuntu.com
That's why I suggested xrandr. It's a pretty neat feature that's not all that well known.
Most of the them the offered resolutions under display settings there is at least one that works for your screen.
It may be an idea to try a resolution with a different screen ratio?