PostmarketOS is a Linux distribution for phones that tries to bring as much device support into mainline as possible. Device support is documented in their wiki

PostmarketOS is a Linux distribution for phones that tries to bring as much device support into mainline as possible. Device support is documented in their wiki: https://wiki.postmarketos.org/wiki/Devices https://wiki.postmarketos.org/wiki/Devices The only non-obscure device in that list that has a "Yes" in the "mainline" column seems to be the Sony Xperia Z2 Tablet.