I have ZTE MF633 and it has this "feature", opening or closing /dev/ttyUSB1 blocks the program that is trying to open/close it for about 5 seconds. This in turn slows down modem-manager's probing speed. It takes about 60 seconds from plugging it in an entry appearing in nm-applet's menu. I don't know whether this needs to be addressed in kernel or MM, but it's quite annoying to wait for 1 minute for the modem to be usable. Maybe probing ports in MM in parallel (threaded) makes sense? Currently the PPP data ttyUSB port reports instantly, and I imagine that a threaded solution would speed things considerably.
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