On Fri, 2003-05-30 at 18:17, Greg KH wrote: > On Fri, May 30, 2003 at 04:56:13PM +0100, Martin Evans wrote: > > > > There are no timeout or other error messages from the usb_control_msg > > statement in the driver. As far as I can tell, the function returns > > normally with a zero exit status. > > But it looks like the message isn't getting out to the device? Any > chance you need to have a self-powered hub in order to get enough power > out to the pl2303 devices to all be able to signal a break? >
They are on self powered hubs. The main ones are 7 port hubs. However, I do have another 4 port hub (again self powered) lying around and that has similar problems when 4 devices are attached. > The fact that this happens when you start to have a lot of devices all > attached to a single hub lends itself to being a hardware problem... > If that was the case I would see data loss during ordinary serial transfers, there is no such data loss... ordinary characters get through OK. Also I'm curious as to why the usb_control_msg function returns 0. Would that fail with a timeout or something if there was not enough power to see the device? Thanks, Martin. -- -- Dr MDT Evans, Computing Services, Queen Mary, University of London ------------------------------------------------------- This SF.net email is sponsored by: eBay Get office equipment for less on eBay! http://adfarm.mediaplex.com/ad/ck/711-11697-6916-5 _______________________________________________ [EMAIL PROTECTED] To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-devel
