<QUOTE> I've set up a USB modem (MultiTech 5634ZBA) on /dev/ttyACM0, made the entries in /etc/uucp/port and /etc/mgetty/mgetty.config and /etc/inittab. I can dial out fine with uucp, cu, and kermit. But, when I dial into the system I can't get ioctl's "opost" to work properly. - It always stays on one line (cr without nl) no matter what I do with stty... ................ I set the crlf option in kermit and the display works properly. Here's the problem -> 200+ servers in the field that will triple space when crlf is set in the emulator. I have around 15 support/training folks who dial into these systems constantly from various locations... Is there a reason that usb is different from serial, telnet and ssh in that opost is ignored when set by stty? If so, then I'll have to train everyone to handle it when they encounter a usb modem. </QUOTE>
This confirms the experience I've been having for months trying to get "dumb terminals" (eg. a wyse 60) (note: NOT terminal emulator software) to work over a usb-serial connection to a linux host. If put into "raw" mode via gettydefs, it works fine (ie. all the data flows from the terminal to the host and vice versa and appears on the screen), except that it is stair-stepped (or, to use your term, barber polled). Whereas if put into "SANE" mode the terminal "locks up" in short order... namely right after the user hits enter at the password prompt. After fiddling with every conceivable option in Wyse's setup, I've never gotten it to properly display the "raw" output from the host.
I experienced this on 2.4.18 through 2.4.20, but have not tried on 2.4.21 yet.
However, I just tried to set up a dial-up modem for plain serial terminal / host login use over a usb-serial converter (ie, host->usb->rs232 modem) on a linux host running 2.4.21 and experienced essentially the same problems.
This same behavior displays no matter what type of serial converter I have used: guc232, pl2303, and keyspan.
From reading this thread in the archive, I take it that the dev's don't know about this being a problem. Or maybe we're uninformed about how to handle this situation..... Any dev's out there listening?
-Patrick Bennett
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