On Mon, Dec 20, 2010 at 03:15:05PM -0500, Alan Stern wrote: > On Mon, 20 Dec 2010, Piotr Isajew wrote: > > > Hello, > > > > I would like to get back to this. I've been testing hso with > > debugging turned on. From what I see, there are sometimes > > problems with result detaching devices from the bus. From > > application point of view, at the beginning there is an IO > > timeout, and then device disappears. Current tests show that > > device reattaches in a while, application can reopen it and > > continue it's job. > > Your log shows that you are getting lots of hardware communication > errors. You should check the quality of your USB cables and > connectors. > That could be the point, but it's the system with several modems connected through 2 external USB hubs. Nobody touches it. After device reattaches, it works fine for several hours if not days (no XactErrs then). Before I started to use those hubs I worked with 3 other from different vendor and there have been similar symptoms. I would rather bet there is something wrong with Option modems in general, that makes them irresponsible to the OS under some circumstances. The question is: can this situation be handled without disconnecting the device (ie. by increasing number of retries)?
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