Some fonts too small in qt applications (wrong xorg dpi setting)

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https://bbs.archlinux.org – Hello everyone,On my system (Arch64, Gnome 3), some fonts are very small in some applications which use qt. All the fonts in Spotify (native) are barely readable. Same thing in KeepassX for the entry details in the bottom panel, although the rest of the text is normal. VLC works fine.I checked the default font in qtconfig, it's Cantarell 12 (as for gnome). I tried changing it, it doesn't change these fonts. It looks to me that the problematic fonts are the ones that are fixed by the application.My screen is a 15.6" with 1920*1080 (so normally 140 dpi). The real dimensions are 34 (HowTos)