[BRLTTY] Brltty woes on Centos 7

[Dave Mielke]

[quoted lines by Keith Wessel on 2017/03/03 at 16:23 -0600]

>Interesting that it can't get the console control at first boot but that it 
>can when I start it manually later. A timing thing, I suppose.

No, it's not all that surprising. What it means is that brltty is getting 
started so fast that all of the core devices haven't been fully set up yet.

>The braille display thing is odd. Once I get to this point where it is only
>displaying "screen not in text mode" because it couldn't get console
>control, the buttons, rather than playing their PCM tunes, generate errors
>in brltty's log. Looks like it's getting invalid data from the braille
>display. 

That, of course, is unlikely. More likely is that something has changed the 
port's baud. This is something you can query using a command like:

   stty -F /dev/ttyS0

Note that both the F and the S are uppercase. Specify the same device your 
braille device is connected to. See what it is when your braille device is 
working correctly, and then check what it is when your braille device isn't 
working correctly (I'm hoping that you're able to do that). You'll get several 
lines of output - the baud will be on the first one. The easiest may be to 
redirect the stty command's standard output of a file.

>I've also confirmed and, as far as I can tell, Centos isn't trying to start up 
>any serial consoles that might be conflicting.

But it may be probing the serial ports for mice, modems, etc.

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