Non-standard USB_TIMEOUT in libusb.c is causing problems with Eaton 5PX UPS, usbhid-ups won't start

[stevenbg]

Hello,

I reported a problem with the USB driver and an Eaton 5PX UPS. usbhid-ups failed to start, because it timeouts while receiving the descriptor. The USB_TIMEOUT constant in libusb.c is set to 4 seconds, instead of the standard 5 seconds.

Here is the original thread: http://www.mail-archive.com/nut-upsuser@lists.alioth.debian.org/msg07676.html

Here is the constant I'm talking about: https://github.com/networkupstools/nut/blob/master/drivers/libusb.c#L38

[aquette]

I confirm this issue.
You did well find and point the faulty param.
and as commented, this was not the default value for perf reasons (sigh!)
On 5PX, this is related to a small increase in the report descriptor
(describes the data struct)
which, by side effect caused the main issue you found (timeout on init, and
failure to init comm. with the device).

I have fixed it in the latest master, which will be available in the next
release (probably a soon to come 2.6.6...)

Note that I've also opened a tracker for adding a new "communication
timeout" option (GitHub issue #24)

Thanks and cheers

[aquette]

closed with commit 9758dcf.
I forgot to reference the present issue in the commit message...