Am 26.09.2013 11:52, schrieb Klaus Weglehner:
>
> Anyway, i have tested another USB Host controller on the raspberry pi
> with only one direct DS18S20 attached. It shows the same errors after a
> few minutes while accessing the uncached entrys repeatedly fast.
>
Have you checked for the w1 kernel functions? I have the same problems
(chips are sometimes missing) when the ds2490 kernel module is active.
These problems disappeared immediately after unloading that module.
>
> What does "USBsendback control error" mean?
>
Some command could not be sent to the DS2490 because libusb replied with
an error.
> At this time there was a syslog entry concerning usb:
> kernel: [564749.208882] usb 1-1.3.3: usbfs: USBDEVFS_CONTROL failed cmd
> owserver rqt 64 rq 1 len 0 ret -71
>
Error code -71 looks like a kernel/hardware related problem. Do you use
a hub? I had a lot of USB hubs which have been rubbish.
Kind regards
Jan
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