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I've installed Arch Linux and Plasma Desktop on one of my old PCs (12yrs or more), it's AMD Phenom II Quad Core, ATI Radeon 3000 and 4 GB RAM. On Samsung SyncMaster S19B150 (max res 1366x768) it works but fonts are choppy so I wanted to test it on a lenovo ThinkVision L1900p 19-inch Monitor BUT it displays a messege input signal out of range! lenovo actually works fine on another old (15 yrs or more) Windows machine with Intel Dual Core.

How can I get rid of that error on lenovo and make plasma desktop work on that monitor?

EDIT

I'm not sure whether it's an Arch specific problem. If I plug in live ubuntu usb-stick or live KDE neon usb-stick, it works, fonts everywhere seems alright BUT the screen resolution is low!

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I've no problem with this monitor on windows with 1280x1024.

Edit

It must be an Arch specific problem or I don't know how to resolve this issue on Arch yet! Void linux with Plasma desktop works fine on this monitor except for that low 1024x768 resolution.

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The solution for this problem is change the VGA connector. I don't know why did it come into my mind after so long: I just took off the VGA connector of SyncMaster and plugged that in to lenovo! Now I can see "Arch with plasma desktop" on its optimum resolution 1280x1024 and on this monitor I don't have the choppy font issue.

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