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I am using SDDM with KDE Plasma 5 in VirtualBox.
When the system boots and SDDM is loaded, the resolution is lower than usual, but once I log in, Plasma 5 could give me the correct resolution automatically.
So what is the problem?
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Maybe becuase of theme resolotion...
default sddm them seems dont detect res or it's have a static res
Try change theme res or install another
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