how do I find out what's hanging me up?

Anders Holmberg anders at
Tue Jul 5 13:58:21 UTC 2016

There is another app i think is called aipolyvision or something like that.
I really don’t know how to spell it but you can point your camera on things and it tells you what it is.
I don’t know if its good enough to read text on screens.
You also have the talking gogles app.
> 5 juli 2016 kl. 01:25 skrev John G. Heim <jheim at>:
> I was amazed by the results from Tap Tap See. I pointed it at my guide dog and it said, "light brown medium coat dog". But googling shows me that it relies at least partially on humans to identify your objects. I suspect if the human sees words on the screen, she sends it off to the ocr infrastructure which then sends the results back to you. You may do slightly better with the knfbReader app. I've had some limited success with it reading computer screens. It seems to do better with GUI screens than character screens. It maybe that it doesn't like white letters on a black background.
> I have a thumb drive with the Win7 installation image and an answer file. So I can boot from this thumb drive and it installs Win7. I've been able to keep up with the progress by having the knfbReader read the screens to me. But when I've tried it on a character screen, like when a linux machine fails to boot, it never reads more than a fraction of the screen. I've tried the tedious process of moving the phone a little, taking another picture, waiting for results, and trying again. Eventually you might get enough info that way to figure out what's going on. Or maybe not.
> The NFB periodically has sales for the knfbReader app. I paid $75 for it. It wouldn't be worth that just to read computer screens. It's not accurate enough.
> On 07/04/2016 11:26 AM, Mark Peveto wrote:
>> It's not perfect by any means, but brother when you don't have a pair of eyes handy it's better than nothin.  I haven't bought knfb yet, although my
>> fiance, Alicia, has it.
>> Mark Peveto
>> Registered Linux user number 600552
>> Sent from sonar using alpine 2.20.13
>> On Mon, 4 Jul 2016, John G. Heim wrote:
>>> If you can configure a serial console, you would be able to read those
>>> messages. But I still say it's a process in an uninterrruptable sleep which
>>> means the kernel can't kill it during a normal shutdown. That, in turn,
>>> implies that it is a kernel bug in a device driver. In fact, I will wager it's
>>> the driver for your sound card and the process that is in an uninterruptable
>>> sleep is pulse. That's just a guess though.
>>> If the machine is kind of old, it is very likely to have a serial port. Then
>>> you need another computer and a null modem cable to configure a serial
>>> console.  There is a really good serial console howto on the web. No point in
>>> me reiterating all that. If you have never configured a serial console before,
>>> you are not likely to have a null modem cable lying around. But setting up a
>>> serial console is a valuable skill for a blind linux sysadmin to have. You can
>>> even do a serial console install of VMware ESXI.
>>> PS: Thanks for the tip on tap tap see. I'd never heard of it before. I am
>>> going to try it today. When I need to have a screen read to me by my phone, I
>>> have been using the knfbReader app.
>>> On 07/03/2016 01:08 PM, Mark Peveto wrote:
>>>> I've been working on this more today, pulling out all the tools I've got.
>>>> To the point i'm using tap tap see to try and get an idea of what's on my
>>>> screen when reboot hangs.  The most i can
>>>> get  is a message about bus socket display, and a command prompt.
>>>> Not real helpful, but I guess it's a start.
>>>> Mark Peveto
>>>> Registered Linux user number 600552
>>>> Sent from sonar using alpine 2.20.13
>>>> On Sat, 2 Jul 2016, Tony Baechler wrote:
>>>>> On 7/2/2016 1:54 AM, Mark Peveto wrote:
>>>>>> The short version of a long story.  I've just installed sonar on a dell
>>>>>> pc.
>>>>>> I've also got it installed on a compaq/hp machine, where the followig
>>>>>> problem doesn't exist.  On the dell, sudo reboot seems to hang.  Sudo
>>>>>> shutdown works fine.  I've tried sudo shutdown -r now, sudo systemctl
>>>>>> reboot, and
>>>>>> other options.  How, without sighted help, can I find out what's causing
>>>>>> this machine to hang when I reboot.  What's strange is this...why does
>>>>>> it
>>>>>> shut
>>>>>> down just fine, but not reboot?
>>>>> I'm not familiar with Sonar, so consider these random guesses. First, have
>>>>> you
>>>>> looked in /var/log/syslog and kern.log? There might be a process not
>>>>> shutting
>>>>> down properly. If you halt the system, all processes are killed and all
>>>>> filesystems are unmounted. A reboot only resets the system, so I suppose
>>>>> it's
>>>>> possible that a process is behaving badly or the kernel can't unmount a
>>>>> filesystem. I see this sometimes with slow USB devices, like if I copy a
>>>>> ton
>>>>> of files to my SD card. A more likely explanation is an ACPI or power
>>>>> management issue. You didn't say how old the machines are, but it could be
>>>>> a
>>>>> BIOS bug. Recent kernels should work around this. Without knowing the age
>>>>> of
>>>>> the machine and the kernel version, I can only guess.
>>>>> Also, the machine isn't a laptop, right? Laptops usually have power
>>>>> management
>>>>> issues. On Debian, there is a package called acpi-tools. Try installing it
>>>>> if
>>>>> it isn't there or purging it if it's there. I have better luck without it
>>>>> installed. I would bet syslog and kern.log would have clues to your
>>>>> problem. I
>>>>> would check those first. Make note of the time you reboot the machine and
>>>>> look
>>>>> at those files with less. You could try booting a live CD to avoid adding
>>>>> all
>>>>> of the boot messages to the logs. You didn't say if that happens on a live
>>>>> CD,
>>>>> booting from the hard drive, other distros, etc. I''ve noticed most live
>>>>> CDs
>>>>> have strange shutdown problems. You might have to pass a parameter on the
>>>>> kernel command line. Both HP and Dell have issues with Linux.
>>>>> --
>>>>> Tony Baechler, founder, Baechler Access Technology Services
>>>>> Putting accessibility at the forefront of technology
>>>>> mailto:bats at
>>>>> Phone: 1-619-746-8310  SMS text: 1-619-375-2545
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