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The Matrox DualHead or TripleHead might work for you. It’s not USB - it connects to the system’s video out.

The device tells the computer that you’re running an ultra wide display (3840 x 1080 for example) and then separates the video signal to each display connected. Since it’s a hardware solution it is as fast as your GPU (and even integrated graphics would be faster than USB) and should be OS agnostic for your Linux needs without the overall glitchyness of the USB devices. Gxm/ Edit: looks like it needs to be set up under Windows, but after that it is good with Linux. Been doing some digging and there is Ubuntu support for USB-VGA adapters based on the DisplayLink chip. Vizitka na anglijskom yazike obrazec 10. I expect some latency but this is 2D desktop stuff; I just need to montor some apps that track phone system status, etc.

The DisplayLink sites mentions support only for certain versions of their chips though. A lot of the ones you find at a reasonable price (less than 50 bux) are unsupported versions. I would rather go this direction instead of getting in the middle of buying an expensive video card and HOPE there is good support for it on Linux. Been doing some digging and there is Ubuntu support for USB-VGA adapters based on the DisplayLink chip. I expect some latency but this is 2D desktop stuff; I just need to montor some apps that track phone system status, etc. The DisplayLink sites mentions support only for certain versions of their chips though. A lot of the ones you find at a reasonable price (less than 50 bux) are unsupported versions.

I would rather go this direction instead of getting in the middle of buying an expensive video card and HOPE there is good support for it on Linux.

The Plugable USB3-VGA graphics adapter allows a standard VGA monitor to be connected to a Windows® PC via a USB 3.0/2.0 connection. An adapter is required for every monitor you wish to connect via USB, up to six adapters per PC. Power is provided by USB. The adapter can display in resolutions up to 1920×1080.