One of our (brltty) users is reporting a problem which has begun to occur with his braille display. It turns out that the problem is actually with how Linux is interacting with the USB to serial adapter which he's using. dmesg reports that Linux is using its ftdi_sio driver. The problem is that the ftdi_sio driver's data toggle and the ftdi_sio adapter's data toggle are now at risk of starting out (opening of ttyUSB0) out of sync. I'm sure this is the problem because it's seemingly random, and, when it occurs, it corrects after a few data transfer attempts. As you'll see below, this is a new problem which the ftdi_sio driver didn't used to have. He's using a Debian system, so my references to kernel releases are what that distribution calls them. His ftdi_sio adapter worked fine up until, and including, kernel 2.6.32-3-686. Then, when he upgraded to kernel 2.6.32-5-686-18, the problem started to occur. It still occurs on Debian Unstable's kernel 2.6.32-5-686-19, and it even still occurs on Debian Experimental's kernel 2.6.35-rc6-686, so I suspect this is a problem which hasn't been addressed yet. -- Dave Mielke | 2213 Fox Crescent | The Bible is the very Word of God. Phone: 1-613-726-0014 | Ottawa, Ontario | 2011 May 21 is the Day of Judgement. EMail: dave@xxxxxxxxx | Canada K2A 1H7 | 2011 Oct 21 is the End of the World. http://FamilyRadio.com/ | http://Mielke.cc/bible/ -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
