Cannot type symbols on dead keys (e.g., to write ', ", or ^)

Using MATLAB R2022b Update 5 on Fedora Linux 37, but also confirmed not working on Ubuntu 22.04. I cannot write symbols that are on "dead keys", such as ', ", or ^. Normally, I would press the key and then space and the character appears, but now, only a space is inserted. It does work when switching to a keyboard layout that does not contain such dead keys (e.g., US International). Is this a bug or a problem on my side? I could not find anything about this issue.

[Antonio Sala]

Well, with 2023a it seems to be a bug, it happened to me in three machines, both in Ubuntu 22.04 and 22.10.

I asked a question to support and they told me it was upstreamed to developer team. However, they could not ensure which priority this was going to have...

I don't have that buggy behaviour in 2022b update 3.

[Andreas]

Yep, the problem came into existence with update 5 I think.

[Antonio Sala]

Still present in 2023b in Ubuntu 22.04.

[Franklin Ronald]

Same issue in R2023B running at AlmaLinux 9. But, it's not a "linux" issue, It's obvious that it's a Matlab issue.

Answer 1

[Tommi Heikkilä]

I had the same issue with MATLAB R2023a, Finnish keyboard and Ubuntu 22.04. The workaround for the issue was the same as here: https://ubuntuforums.org/showthread.php?t=1911860

In Ubuntu settings I set the keyboard to 'Finnish (classic, no dead keys)' instead of 'Finnish' and now the keys work fine in Matlab.

Of course the behaviour is also slightly different: the symbols '¨ ^ ~' are typed straight away instead of being able to write accented characters but to me it's no big deal.

[Andreas]

That's also the solution I used (select a keyboard layout without dead keys). Still, it'd be nice if this were fixed.

[Tommi Heikkilä]

Yes, there is definitely something wrong with how Matlab or Ubuntu currently treats the dead keys because they used to work just fine. I just wanted to offer a workaround / bandaid solution because it is a super annoying problem.

Answer 2

[Cris LaPierre]

If those keys are only not working in MATLAB, please report this as a bug to customer support: https://www.mathworks.com/support/contact_us.html

[julien javaloyes]

Here is one workaround.

Either write in a terminal 'setxkbmap -variant nodeadkeys' before running matlab

or put in our startup.m system('setxkbmap -variant nodeadkeys');

both seems to work on manjaro 23.0.0

[Simon Beyer]

still not working for me

[Antonio Sala]

I spoke to customer support when that happened to me at 2023a launch... They replied they moved the issue "upstream"... but, well, the bug is still there in 2023b, I just installed it but, sadly, cannot type accents in my MLX files for my students, nor 2^2...

I don't know if 2023b would have any workaround, but I didn't find any for 2023a. "No dead keys" keyboard setup means "useless in a language where 30% of words have accents".

[Andreas]

@Antonio Sala Thanks for your reply, shame to hear the issue hasn't been resolved yet on R2023b. Perhaps as a temporary workaround, you could use a different editor to write the text and copy-paste that into the mlx file.

[Edilberto]

I have the same problem with Ubuntu 22.04 and Matlab 2022b, 2023a, 2023b.

[Antonio Sala]

This bug seems to have been resolved in 24a prerelease... Well it's still unreleased/beta so who knows if fixing something else will break that again but, for the moment being, there is hope in the horizon.

[Ramz]

I tried the MATLAB 24a pre release and the 24a official release but the problem was still there for me on Ubuntu 22.04. With a normal (German) keyboard, either "normal" keyboard settings and also "no dead key" settings all result in some weird state change that after a bracket { or [ i can not continue typing unless i press escape or click on the cursor. It is really annoying, disturbing the workflow. Also If by accident the esc key is pressed twice or to long, all previously typed text on the commandline dissapears. Later i found that this could be solved for me by using: com.mathworks.desktop.mnemonics.MnemonicsManagers.get.disable

The problem was that to write brackets and other characters the Alt Gr key was necessary, but this was some how assigned to other short cuts, not visible in the short cut menu.

Answer 3

[Daniel]

I had the same problem with Ubuntu 24.04 and MATLAB R2024a.

To solve it, I just start matlab as super user with the command "sudo ./matlab" from the folder ......../MATLAB/R2024a/bin