i too have confirmed that the usb-rs232 adapters as well as several usb modems have this same problem that larry and patrick have reported. i'm currently working with 2.4.21 with the last round of patches from GKH. i'm also loading the usb stuff down with massive debugs to see if i can find out whats going on. i'm new to usb-dev, so its gonna take me a little while to get up to speed on the api enough to trace down this issue.
patrick wrote:
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.
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