This is probably more a work around, than a real answer:

As long as 12 vdc power is applied to the 590, it is always "on", just 
kind of asleep.  Even with the radio turned off, the pc will always see 
the USB sound device in the radio. .  If you kill the power supply to 
the radio before starting up your laptop,  the USB audio  chip in the 
590 won't exist as far as the computer is concerned.   So your laptop 
should start as normal.    What happens when you now turn  on the ps to 
the 590 is anybody's guess.

73, Steve KW3A

On 10/23/2015 12:19 PM, howard kaufman wrote:
> Please respond to the list, I want to know to.
> When I connect my laptop to my ts-590-s, even with the sound settings saying
> don't use anything but the defauly sound card, I get no speech at the log in
> screen.
>
>
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Steve Dresser
> Sent: Friday, October 23, 2015 10:37 AM
> To: [log in to unmask]
> Subject: TS-590 sound card
>
> Hi all,
>
> Now that I have my 590 connected via USB to a computer, I need some =
> pointers on how to take advantage of the radio's built-in sound card.  =
> Since this topic may not be of general interest, please feel free to =
> respond directly to me at [log in to unmask]
>
> I appreciate any help I can get here.
>
> Steve
>