Ooops! Taked a deeper look on the Nvidia box: it turned out that for some reason breeze was still at -3. Then I tried to install -4 and... same as Intel: kwin_x11 crashed immediately at session start.
Sorry for the noise. -- To UNSUBSCRIBE, email to debian-bugs-rc-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org