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On ubuntu it is under monitors (might be a gnome thing) and you just select right or left under rotation.

I'm sure kde has something similar, but one thing to be aware of is that some monitors are specifically designed to be viewed horizontally so fonts and other things may render weird when rotated.

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One thing to keep in mind is to disable sub-pixel rendering of fonts, or at least change the layout from RGB to VRGB. Otherwise, the fonts might have color outlines due to wrong assumptions about the sub-pixel layout made by the renderer.

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