Serial ports with 32-bit vs. 64-bit processors

Ryan Hutchings RyanHornibrook at
Thu May 16 15:06:36 EDT 2013

Hi John,

Did your doubletalk work during wheezy installation as well?

I tried using my doubletalk lt with Wheezy 64 bit to install, and got no 
I also tried the latest grml live 64 bit cd, and got no speech after doing a 
modprobe speakup_ltlk.

I wonder what determines when speakup will work with hardware speech? if it 
works on your 64bit system it can't be a 64bit thing.
I tried this on a laptop if that makes any differences?
Maybe a device in my laptop interferes with the speakup serial code - i.e. a 
device is using the i/o address that speakup normally associates with a 
serial port?


-----Original Message----- 
From: John G. Heim
Sent: Thursday, May 16, 2013 3:59 PM
To: Speakup is a screen review system for Linux.
Subject: Re: Serial ports with 32-bit vs. 64-bit processors

Are you saying you can't get your doubletalk to work at all or only if
you load the speakup_sot module before loading the speakup_ltlk module?
I don't know if I've ever tried that. But  I have a 64 bit machine
running squeeze and another running wheezy. Speakup works with my
doubletalk on either  machine if I load the speakup_ltlk module
directly. On the squeeze, I'm running a kernel from squeeze-backports
and on the wheezy machine, I'm running the stock kernel. Here  is what
uname -r says on each;
squeeze: 3.2.0-0.bpo.4-amd64
wheezy: 3.2.0-4-amd64

My doubletalk also works with the 64-bit grml live CD.   As I said, I'm
not entirely sure I ever tried loading the speakup_ltlk module after
speakup_soft. I would have to say that I have though because I put
speakup_soft in /etc/modules so it loads during boot.

On 05/16/13 04:07, Tony Baechler wrote:
> Hash: SHA256
> Ah, that's what I've been wondering about.  I've asked various people here
> who claim to have working hardware speech, but never got a response.  My
> question is if they're running 32-bit or not.  I can not only confirm that
> it won't work on 64-bit systems but if I try to unload speakup_soft and
> load speakup_ltlk, it completely locks up the system.  Someone else said
> they didn't have any problem with serial speech with new kernels and a
> 32-bit processor, but I couldn't get it confirmed.  Now, my question is
> what difference would a 64-bit processor make?  Why does it completely
> lock up here but seems to work for at least three people on older 32-bit
> processors?  I'm tempted to install 32-bit Debian Wheezy just to see if it
> makes any difference.  I can say that it doesn't seem to matter on a
> 32-bit live CD here.
> On 5/15/2013 3:45 PM, Adam Myrow wrote:
>> Ok, I am using the kernel that ships with Debian 7.0, which is listed
>> as 3.2.0-4-686-pae.  My Dectalk USB works just as it always has in
>> RS232 mode. In other words, serial support isn't broken for me.  This
>> is the 32-bit version, so maybe that's the difference.
>> _______________________________________________ Speakup mailing list
>> Speakup at
> - --
> Have a good day,
> Tony Baechler
> tony at
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John G. Heim, 608-263-4189, jheim at
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