I have W25CSW laptop that is little used and in excellent condition.
Recently several keyboard keys have stopped working. “Ctrl” (both left and right) and “Alt” are hard fail. Backspace and “(“ are intermittent. The very odd thing is that when “(“ [shifted “9”] isn’t working the “9” remains working. “(“ and “9” are of course the same key.
I don’t think it’s a failure of the physical keys as it’s unlikely they would fail at the same time. The right “Ctrl” is never used so it won’t be worn out. I have reloaded system drivers.
I’ve used some of the online keyboard testers and they show the keys not working. Is there any way I can check the actual scan codes being generated (or not) by individual key-presses? That would help with fault diagnosis. I guess at some point I will have to check the keyboard connector for problems, but would like to have a ‘scan code checker’ first.
Any other suggestions welcome.