[BRLTTY] Clickable links, virtual consoles etc. (Was Re: Footsteps towards better accessibility in Linux)

[Sébastien Hinderer]

Nicolas Pitre (2025/05/09 11:43 -0400):
> On Fri, 9 May 2025, Sébastien Hinderer wrote:
> 
> > Nicolas Pitre (2025/05/08 10:50 -0400):
> > > I currently use a 160x120 screen. Should work fine even up to 240x240 if 
> > > you want.
> > 
> > How do you know these limits?
> 
> I saw the kernel code for /dev/vcsa and /dev/vcsu.
> 
> The screen size and cursor position information use only one byte each. 
> This means the actual limit that can fit is 255. However, at least as 
> far as columns go, it is nicer to have the screen be a multiple of the 
> braille window width, hence 240.

Okay yes so then it means we could go up to 255 lines, too, right?

> > I tried specifying nothing and I got a 135 lines per 480 column screen
> > which was actually not usable, for reasons I am not able to explain.
> 
> What do you mean by "specifying nothing"?

At least on Debian, there is a file called /etc/default/console-setup in
wchich you can define two shell variables, SCREEN_WIDTH and
#SCREEN_HEIGHT. I meant I left these two undefined and that's how I
obtained the 135 lines by 480 columns, this second number actually
making not much sense if I understood you correctly.
 
Seb.