[argyllcms] Re: Multiple issues with Argyll, please help

Rajiv Mehra wrote:

yes, there is something wrong somewhere. I dont know where to start looking. 
All I know
is ....if I remove and reinsert the USB plug of the instrument, Argyll works 
fine for a
few minutes more and craps out. Isn't the Argyll driver in question here?


Well seems that in testing dispcal on Vista, purely by accident, I have
observer a problem very similar to the one you describe.

It seems that Microsoft in their infinite wisdom, have changed the
behavior of the SetThreadExecutionState() in Vista so that it
no longer resets the Screen Saver timeout. This meant that in the process
of testing dispcal, the screensaver started on me, and it seems that
the particular screen saver I had chosen exposes the instrument to
low level illumination that changes dynamically (or perhaps it's low level,
colored illumination), and that sometimes triggers a timeout in the driver
that I haven't seen under any other circumstance, including very low
levels of constant illumination.

It seems that 30 seconds is insufficient, and that sometimes the
instrument takes over 60 seconds under these conditions.
So increasing the timeout time solves the problem, although
I wonder what the circumstances are that are triggering it (ie. what it
is about you projector output), and I wonder what the instrument is up
to, since a minute is a long time to take a reading.

I'll see about including the change in the next release.
Note that the libusb-win32 driver will need to be re-installed
for this updated version, since it has a maximum USB control
timeout hard coded into it.

Graeme Gill.

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