Here is a dmesg debug output, rm has an agetty connected, screen connected via keyspan. I dont get any newlines.
> S0:12345:respawn:/sbin/agetty -L 9600 keyspan screen
agetty sttys the port to onlcr (map newline to carriage-return newline). However, the pl2303 cannot do this; it will only output a carriage-return and the newline is lost.
To work properly with the tty line discipline code, a serial driver must be able to output as many characters as it reports in write_room _without delay_. The pl2303 delays after each write until the URB callback comes in, because it has only one URB and no buffer.
-- Al
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