[BRLTTY] HID slowness

[Yannick Plassiard]

Hi everyone,


Following on Sébastien's previous mail, it seems that this "HID 
slowness" is not restricted to the HIMS eMotion brailledisplay. I 
actually managed to produce the same issue using a Brailliant BI 20X and 
40X models from HumanWare, that also use HID Braille protocols.


Therefore, does anyone on this list has a HumanWare Brailliant BI 
20X/40X display, and if so, is this issue reproducible on your device? 
(meaning, having a 1-second delay between a keypress on the display, and 
the corresponding action being done).


If not, I'm trying to find some time to borrow a HID-Braille device to 
do some more tests, maybe in a few weeks.


Cheers,

Yannick



Le 04/03/2025 à 09:11, Mattia Scattolin a écrit :
> Hello,
>
> I have a Braille emotion and find the same problem.
>
> Also there is a problem with multi key navigation for example to go at beginning of screen the multi key doesn’t work in both modes
>
>
>> Il giorno 3 mar 2025, alle ore 17:15, Sébastien Hinderer <Sebastien.Hinderer at ens-lyon.org> ha scritto:
>>
>> Hello,
>>
>> Yannick and I happened to meet at one of our national distributor's
>> office. We tested an eMotion device from HIMS whichwe found rather nice,
>> ergonomically speaking.
>>
>> In terms of USB connectivity, two modes of connection are supported:
>> legacy and HID. Although both modes do work with BRLTTY, we noticed
>> that, in HID mode there is considerably more latency than in USB legacy
>> mode. For example, the round-trip time between a keypress and the
>> corresponding update of the braille display nears the second while it is
>> much shorter in USB (without being of great reactiveness but we think
>> this is an internal problem).
>>
>> Any suggestion on what could be done to improve the situation?
>>
>> Best wishes,
>>
>> Seb.
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>