Okay thank you for your quick respond. Well in same situation now, I see around 1200MB free RAM available when I restarted phone.. Does linux really allocate/hide that free RAM, so I can't never know really how much I got free RAM?
So how about last bug: "In thermals page there is two battery lines for no reason"? That is clear bug, Maybeit showed up only xperia x if you can't see it in other sailfish devices. Here is screenshot about it.
English isn't my native language so I got little bit problem to understand your whole explanation. And yeah these bugs are very minor but, better to report than let it be.
Do you have any plans to acquire xperia x for test device? That would help to reproduce bugs etc.