Whenever I am using an X11 session or a XWayland window, there is a chance the keyboard will stop working (globally for X11, only in XWayland windows if session is Wayland) until the session is restarted.
Nothing gets written in any log, the keyboard just stops getting registered in X11/Xwayland contexts. It will happen usually after heavy operations of the keyboard (like holding a shift key, or multiple buttons get pressed repeatedly or too quickly). It happens almost every time I play videogames, and happened only once during normal typing.
Attaching an external keyboard doesn't matter, as it will have the same synthoms.
This is the only proper mention of my issue online https://bbs.archlinux.org/viewtopic.php?id=274456
I am using a ASUS VivoBook Pro 15 N580VD laptop. Running Debian 12 and KDE Plasma. This is not a faulty keyboard, as doesn't happen on Windows and in strict Wayland contexts.
EXTRA info:
I want to further add that the only keyboard that remains working in a full X11 environment is the Super key, that in KDE Plasma opens the application list (like Microsoft Windows).
If it is known, here is a not full list of applications I was using when this was happening and what are they based on:
Minecraft, Project Zomboid (Java GLFW)
League of Legends, Palworld (Windows applications under Wine/Proton)
Victoria 3, Crusader Kings 3 (Native Vulkan applications under, X11, they use XWayland on Wayland contexts)
Libreoffice, CodeBlocks (Native WxWidgets applications)
I have noticed playing Minecraft that the keyboard will stop working after releasing the key at the time it "decides to break".