I have a tablet PC than runs Fedora Workstation greatly! However, the digital keyboard that comes bundled-in seemingly cannot type out special character such as é, à, ô and others. I don’t know what the issue with that is since I have configured the keyboard with the right language and special character key settings. 
I haven’t got a tablet PC, but I imagine the keyboard is similar to the on-screen keyboards on regular PCs.
When you say you cannot type the special characters, is it that you see them on the keyboard, and they just won’t get entered in the whatever app you’re using?
Did you try to activate another keyboard layout with special characters, such as German or French, in order to see if it is a general issue or rather related to the specific keyboard layout you are using?
Hopefully someone here with a tablet PC will see your question and be able to test it.
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This is a general issue with the on-screen keyboard regardless of what app I’m using, even though I’ve configured it with the settings for my language and everything, I tried using tweaks, but that made the problem worse somehow so I returned to the defaults. I tried going back to English to see if that affected anything, but it seemingly didn’t. The choice to type the special characters appear, but when I press then they don’t appear. Regular letters and individual characters by themselves do appear when pressed however.
Does this also happen if you select standard German keyboard layout, and press the key ü for example?
I tried it and it does let me type ü with the German keyboard where it wouldn’t let me before, but most of the special keys remain not working. I then tried adding all of the other keyboard variants available for Portuguese minus the Dvorak ones (which is what I use those special characters for, English doesn’t really use them as far as I know). But none of it solved the problem completely! But I did find a configuration which made a few of the accents possible, so my typing came off as substantially more coherent, even if they’re not the perfect grammar I like to look at. Nevertheless, I do the vast majority of my work in English anyway and utilize Portuguese primarily for casual conversations. But still, it’s odd that only parts of the on-screen keyboard are workable instead of all of it, why have those keys there to begin with if they’re not gonna work?
Still, it would be nice to have all of the keys usable, isn’t there are a overly complex sudofu way available to allow all of those characters within the on-screen keyboard to be used?
Could you tell exactly what keyboard layout are you using, given that I couldn’t find the characters you have mentioned (é, à, ô) neither on Portuguese, nor on Portuguese (Brasil) layouts? Are you setting the keyboard layout from GNOME’s Settings app?
What kind of configuration?
BTW, did you know that you can obtain special characters with alt. keyboard layouts (where special characters act as modifiers), such as the English (US, alt. intl.) one? By pressing ´, then e, you obtain é and so on. You cancel the modifying action of special characters by hitting space after them.
I’m not really sure to be honest, I put on all of the Portuguese variants, settling on Brazilian Portuguese, then did the alt thing for both the left alt and right alt, despite how the alt keys don’t show up on the on-screen keyboard, it’s like an smartphone where you just have a key that sends you to a different keyboard layout that’s full of special characters. I tried using GNOME’s setting app, tweaks, after finagling with the in-built unnamed settings and that only made it so that no special characters at all could be used so I went back on it. So far, ´ works but most of the other modifiers such as ^ and ` don’t work. A handful of other special characters like ç do show up now, but not the full range like on a regular computer like the one I’m using for this.
Maybe too many uncorrelated tweaks could have caused this behavior.
You might want to create another user (given that the already made configurations are user-based), and with the new user test the English (US, alt. intl.) layout, to see if it changes anything.
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Are you using the keyboard from accessibility? If yes this look very different and also misses Ctrl, Alt & Alt Gr key what makes it difficult to use for special characters.
Have you seen the app “CoreKeyboard” this might give you a better experience with the onscreen keyboard.
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Added gnome, libinput, onscreen-keyboard and removed intel
I tried the the app “CoreKeyboard” and it always crashed before I could even begin to use it, so I’m not even gonna bother with it since my current arrangement is good enough for now.
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