usb - Does ubuntu store tty settings? - Ask Ubuntu

here story:

from fresh install of ubuntu use serial usb device. screen /dev/ttyusb0 goes fine , can interact device perfectly.

then unplug device, plug 1 (a 3g modem). again screen /dev/ttyusb0 , fine.

but then, plug again first device , screen /dev/ttyusb0 , got scrambled !

i supposing whatever reason tty parameters changed. there way ubuntu (or screen) store somewhere ? how can initial settings ?

so far tried:

• rebooting
• stty sane

found it.

two screen instance reading /dev/ttyusb0

removing them solved issue.

now, looking solution prevent me mistake again: https://serverfault.com/questions/811474/how-to-prevent-screen-to-open-the-same-serial-device-twice