[kepler-dev] [Bug 5341] Belkin f5u409 usb=>serial dongle periodically stops working

[bugzilla-daemon at ecoinformatics.org]

http://bugzilla.ecoinformatics.org/show_bug.cgi?id=5341

--- Comment #3 from Derik Barseghian <barseghian at nceas.ucsb.edu> 2011-04-20 14:07:15 PDT ---
The prolific dongle dies too, in a similar fashion - at a certain point dmesg
shows errors and you can no longer use it without a system restart. I tried
simply reloading the pl2303 and usbserial modules, but no luck, lsusb -v will
still include an error for the dongle:
cannot read device status, Connection timed out (110)


dmesg:
------
usb 1-1: cr1k_d timed out on ep0out len=0/0
usb 1-1: cr1k_d timed out on ep0out len=0/0
usb 1-1: cr1k_d timed out on ep0in len=0/7

and later:

usb 1-1: lsusb timed out on ep0in len=0/255
usb 1-1: usbfs: USBDEVFS_CONTROL failed cmd lsusb rqt 128 rq 6 len 255 ret -110
------

Now I've changed:
/sys/bus/usb/devices/usb1/power/level (MUSB HDRC host driver)
/sys/bus/usb/devices/usb2/power/level (OMAP-EHCI Host Controller)

from auto to on, to disable autosuspend, in case something has a problem
resuming after suspension.

/sys/bus/usb/devices/1-1/power/level (the USB-Serial Controller) was already
on. 
Let's see if this helps. 

Other things yet to try: a keyspan dongle, ubuntu upgrade, connecting dongle
through a powered usb hub (though this wouldn't be ideal).

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