I'm running potato and modemu has developed a problem. I start it with modemu -e "AT%B0=1%B1=1&W" -c "minicom -o -p tty%s" . The tty%s always translates to ttyp0. Recently the permission on ttyp0 has become crw------- 1 root tty 3, 0 Jul 23 21:37 /dev/ttyp0 I hit it with chmod go+rw and it works for a while, then gets changed back. I have no idea what's causing this or where to look for help.