X-Spam-Check-By:	sourceware.org
Date:	Fri, 23 Mar 2007 15:18:24 +0100 (CET)
From:	Ton van Overbeek <ton AT v-overbeek DOT nl>
To:	cygwin AT cygwin DOT com
cc:	samuel DOT thibault AT ens-lyon DOT org
Subject:	Libusb-win32-0.1.12.1-1 makes system unusable after reboot.
Message-ID:	<20070323150454.V88283-100000@xs2.xs4all.nl>
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I have problems with the libusb-win32-0.1.12.1-1 Cygwin package.
Installation went fine. After running /usr/sbin/libusb-install the test
program worked OK and also my own libusb based program worked fine.
The real problem started after the following reboot.

The /usr/sbin/libusb-install installs the usb filter driver. This filter
is inserted in the drivers for all possible device classes.
At the following reboot the loading of all device drivers in these classes
failed, with as a consequence that none of these devices were working.
On my XP/SP2 system these classes were:
- Universal Serial Bus Controllers
- Sound, video and game controllers
- Modems
- Network adapters
- Smart card readers
- Imaging devices
- Human Interface Devices
- Palm OS Handheld Devices
- Bluetooth Devices
- Portable Devices
This is pretty disastrous: no network, no sound, no ...

The original non-Cygwin package from SourceForge does not have the
problem. It installs the filter driver in
c:\windows\system32\drivers\libusb0.sys and the dll in
c:\windows\system32\libusb0.dll.
The Cygwin package installs the dll in /usr/bin/cygusb0.dll and the filter
driver in /usr/lib/libusb/libusb0.sys.
Installing the SourceForge package after the Cygwin package also solves
the problem, i.e. combining cygusb0.dll and
c:\windows\system32\drivers\libusb0.sys works OK.

My guess is that /usr/sbin/libusb-install omits some crucial step
(registry? kernel service?) which makes device driver loading at boot
fail. I checked the failures by enabling boot logging and inspecting
c:\windows\ntbtlog.txt. All the devices show up with yellow exclamation
marks in the device manager.

I am not a windows driver expert, so for now I cannot use the Cygwin
package.

Ton van Overbeek


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