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I'm using a 13" laptop with FullHD (1920x1080) resolution and an external screen with FullHD resolution too, but of 22". It's quite strange to have a much bigger screen with the same "area space", and I was thinking about manually adding a custom resolution to linux config. I know how to do that, but I'm not sure about a good resolution to setup. Any ideas? Any "don't do that please" answer? If yes, why? |
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LCD monitors have a fixed number of little rectangles called pixels (usually squares) that light up with different colours in order to make pictures. Each rectangle is made up of a red, a green and a blue smaller rectangle. You can see them all with a magnifying glass. The resolution of the screen is the number of these multi-coloured rectangles in horizontal and vertical direction. That is why an LCD monitor only has one resolution it works with. From what you say, this appears to be 1920 by 1280 for your monitors. Likely, the monitors have embedded electronics to rescale a number of different sized images to the correct resolution on the fly for you, which gives the appearance of working with a few other resolutions. This works very well for integer scaling factors. Some can tolerate it when the picture is scaled up, which means new pixels are introduced between the ones that are there on purpose. It works really badly when the picture is too large to display directly, especially if text is to be displayed. In part, this is because parts of letters disappear, lines next to each other are smudged together without space between, slim lines can just disappear. You really don't want that, especially not for extended time. If the problem is the screen elements being larger on one screen than on the other, I suggest you solve the problem by placing the larger screen further away. This also lets your eyes focus on different distances, which some prefer for long sittings. If you just want screen items to have a different physical size than they currently have, you could look into changing the display scale (often referred to as DPI, which is the unit). 96 dpi is the traditional value chosen, and 120 dpi is commonly available and will make screen items appear larger. I'm uncertain if different DPI settings between monitors is possible, though. Adding custom resolutions under Xorg is done with the |
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"FullHD" is a consumer TV term, and is not a restriction on VGA, which is a computer specification. The typical GPU in a PC might be capable of resolutions such as 2560x1600. For example this GPU is only US$30 The typical problem has been finding a computer monitor that can display such a high resolution and doesn't cost 100 times the GPU! However since the GPU in a laptop is connected to its display, the laptop GPU might be designed to offer no higher resolutions than 1920x1080. And your "FullHD VGA screen" could also be limited to 1920x1080. You will have to look up both specifications, since you didn't list the manufacturers & models. Until 4K displays become widely available, resolutions higher than 1920x1080 will tend to be expensive and/or scarce in both consumer TVs and computer monitors, but there is a limited selection of 2560x1600-capable LCD monitors. |
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