I got unworking gpm after yet another kernel rebuild. New kernel version is 4.13.x, and it appears, i disabled CONFIG_INPUT_MOUSEDEV_PSAUX, which is described as legacy in docs. Instead of rebuilding kernel with enabled legacy feature, i replaced “/dev/psaux” and “/dev/input/mice”, and now it is ok.
I’m not sure, is it essential with enabled mouse support or there is option to disable “mice” dev as well
but if essential, would be better to move gpm conf template to “mice”.