Charles,
From: Charles Lepple <[email protected]>
Subject: Re: [Nut-upsdev] a nasty kernel oops
Date: Wed, 12 Jan 2011 22:24:42 -0500
I suspect that the problem goes away once you have booted because the
kernel HID driver has been detached from the UPS once already.
Perhaps I am misreading your description, but have you tried booting
without any USB devices, plugging the UPS in later (maybe once the
system has quiesced), then restarting the NUT init scripts?
I have not booted the system with all USB devices unplugged. What I
have done is booting with the UPS startscript disabled, and then run
the startscript without trouble. Unfortunately I don't have a spare
system, and so these tests always involve significant disruptions.
I will attempt to play around along these lines as well as with your
second suggestion at the next opportunity.
It also might work better to disconnect the kernel HID driver before
starting usbhid-ups. If you have libhid, it comes with an example
program (libhid-detach-device) that detaches the kernel driver from
the first interface of a USB device. If not, it's just a handful of
libusb calls, and we can put together a test program to do that before
usbhid-ups gets to it.
I didn't see an installable rpm package in any of the archives for my
current system, but I have been able to hack the one from Fedora 12,
and libhid-detach-device works as expected. After disconnecting and then
reconnecting the USB cable of the UPS, the kernel reports:
hiddev96: USB HID v1.10 Device [APC Back-UPS ES 650 FW:818.w1.D \
USB FW:w1] on usb-0000:00:1d.0-1
and "lsusb -v" shows the expected short output with:
Report Descriptors: ** UNAVAILABLE **,
after running "libhid-detach-device" it shows the rather lengthy Report
Descriptors.
First observation, on the running system the startup script works fine
with the HID driver attached or detached. I will make some boot tests
as soon as possible!
Thanks for your suggestions, AG
--
----------------------------------------------------------------------
Alfred Ganz alfred-ganz:at:agci.com
AG Consulting, Inc. (203) 624-9667
440 Prospect Street # 11
New Haven, CT 06511
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