[argyllcms] wakeups patch to libusb-0.1.12 causes Eye-One Pro failure on Linux


After some discussions on the libusb list, and some testing on
my Fedora 8 test system, I can confirm that the wakeups
patch being applied to some Linux distributions version
of libusb-0.1.12 (ie. Fedora libusb-0.1.12-wakeups.patch)
breaks operation of the Eye-One Pro instrument.

This is because the patch breaks the ability to acess
two endpoints from two different threads. (Note that
this patch is a CPU usage optimization rather than
a functional bug fix.)

My advice is that Argyll should not be linked
with a system supplied libusb-0.1.12 with
libusb-0.1.12-wakeups.patch, but that the version
of libusb included in the Argyll sources (and which
have been tested against all the supported instruments)
be used until such time as such patches are removed
or corrected.

Graeme Gill.

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