EDIT: after some investigations (switching beetween different firmwares) i now know that it is not portrait / landscape issue but aspect ratio issue. On older firmwares if application needs to run in portrait mode (no alternative for landscape mode) but mode is locked to landscape and not changable, the device maintain proper aspect ratio by itself (screen height is set to 1080, width calculated and set to 607.5, screen centered). It looks like app is working in portrait mode but in fact it is working in landscape with maintained aspect ratio.
But on newer firmwares (mentioned MXIII+ 316k4 or newest Probox2 Ex) these devices doesn't maintain aspect ratio in landscape so for app working only in portrait mode screen is stretched to fill whole 1920x1080 and looks very bad. It is bad setting on kernel level, or something needs to be modified in build.prop or any other config file. I don't see any suspect in build.prop so the change must be done somewhere else or this behaviour is nonfixable at all.
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