On Tue, May 19, 2015 at 10:56:39AM -0700, Marc MERLIN wrote:
> On Tue, May 19, 2015 at 01:21:30PM -0400, Alan Stern wrote:
> > This strongly suggests that the problem lies in the hubs (or in one of
> > them). Something caused a hub to disconnect, and when that happened
> > all of the serial ports downstream from that hub went along for the
> > ride.
>
> Hi Alan, thanks for your answer.
>
> So, when my serial ports go bad, I detect it on a high level, and one of
> my 4 port serial USB hub was connected into a powered USB hub where I
> can toggle ports on and off.
> In that case, the port got cycled, causing a full reset and things to
> start working again.
>
> But, you made me realize that my 4 and 8 port USB serial hubs are USB
> hubs themselves with 4 or 8 FTDI converts in them.
> So, I plugged the 4 port one directly into the PC (the other one was
> already directly connected too), and added external power to it just in
> case.
>
> We'll see if that helps.
Well, looks like you were right, thank you for helping out.
> However, I have many many logs that show that my problems are happening
> during periods of high disk activity, mostly at night when I'm running
> rsync backups, so it still looks like there is a link between the 2.
That was still true though, and I'm not sure how disk access was
affecting USB reliability, but it was.
Either way, plugging the serial converter hub directly into the PC
helped for sure.
Thanks again,
Marc
--
"A mouse is a device used to point at the xterm you want to type in" - A.S.R.
Microsoft is to operating systems ....
.... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/ | PGP 1024R/763BE901
--
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
