Thanks for your comments, both Laurie and Bill. I am quite satisfied that 
one of the power settings available in Win 10 Control Panel is not the 
problem. I have scoured (several times) every device I can find that has a 
power setting and made sure that nothing gets turned off.

That is not to say that there might be something else peculiar about what 
Win 10 is doing.

Also, I have opened the control panel (which gets installed with the driver 
and which always has an icon sitting in the system tray) for my USB audio 
card almost immediately after experiencing the problem with WSJT-X and 
watched the input VU meter bouncing just above its lowest level, meaning 
that, it was seeing the output of my radio. That tells me that the USB port 
has not been shut down by the system.

Bill, I understand your hesitance add a recovery feature for audio cards, 
but such a feature might be similar to the way some OS's display a 
notification that a network cable has been unplugged. As soon as you plug 
the network cable in again, the OS recovers gracefully and even grabs a new 
dynamic IP address if necessary with no further user intervention. Seems 
pretty simple from a user's standpoint, though I don’t know how difficult it 
might be to code in WSJT-X.

I also understand your hesitance because only Mike and I have reported this 
problem, as far as I know. But there may be folks experiencing it without 
commenting.

73

Dave HS0ZLG WA0PND

----------------------------------------------------------------------

Message: 1
Date: Tue, 29 Sep 2015 11:46:35 +1000
From: "Laurie, VK3AMA" <vk3ama.ham.a...@gmail.com>
Subject: Re: [wsjt-devel] Decoding stopped
To: WSJT software development <wsjt-devel@lists.sourceforge.net>
Message-ID: <5609ed7b.30...@vkdxer.com>
Content-Type: text/plain; charset="windows-1252"

Dave,

This suggests that you still have your USB port going to sleep. You need
to check the Power Management settings of the USB soundcard and also the
Power Management settings of the USP Root Hub to which the soundcard is
connected.

de Laurie VK3AMA

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Message: 2
Date: Tue, 29 Sep 2015 09:58:36 +0100
From: Bill Somerville <g4...@classdesign.com>
Subject: Re: [wsjt-devel] Decoding stopped
To: wsjt-devel@lists.sourceforge.net
Message-ID: <560a52bc.2040...@classdesign.com>
Content-Type: text/plain; charset=windows-1252; format=flowed

On 29/09/2015 02:18, Dave Halbakken wrote:
Hi Dave,
> Thanks for your reply, Mike.
>
> I found that this problem can be reproduced by unplugging and re-plugging
> the USB cable to my soundcard. To get WSJT-X fully working again you have 
> to
> swap the soundcard settings away and back on both input and output audio.
> Perhaps a dirty USB cable contact was the cause in my case.
The symptoms you have described are best explained by a USB audio device
disappearing for some reason. The most likely cause of that is some
operating system driven partial shut down in my experience. I know you
have checked that the USB hub sleep settings have been disabled but I do
not know the full details of the Windows 10 changes in that area.
>
> But that brings up a feature request: please make recovery from the
> temporary disconnection of a soundcard both graceful and automatic if
> possible.
That is not straightforward. Maintaining a setting of a USB audio device
that has been removed from the system is leaving the application with an
invalid configuration. Currently we do support USB audio devices being
removed while the application is not running; so long as they are
restored before the application is restarted.

IMHO supporting non-existent devices will lead to far more user issues
than the current arrangement.

Running WSJT-X for extended periods of time while the system is liable
to initiate a power saving strategy, cannot be supported unless that
power saving strategy does not impact the resources being used by WSJT-X.
>
> 73
>
> Dave HS0ZLG WA0PND
73
Bill
G4WJS.


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