In the case of Fn+key reporting a new scan code (or triggering some other type of acpi event like dim/bright screen), this is handled by firmware and thus an implementation detail outside of the keyboard driver
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From: Marion Bond
Sent: Thursday, July 9, 2015 4:27 AM
To: Windows System Software Devs Interest List
Subject: [ntdev] Re: [ntdev] letter cases kbfiltr
Some keyboards actually do send different scan codes for the same key. This is typically implemented through the use of a ‘function’ key and is common on certain brands of laptop
For the OP it seems to be a question of not knowing at what layer something is implemented - is it hardware, KM, or UM where these distinctions are made and the answer is all three depending on the context
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Sent: ?Thursday?, ?July? ?09?, ?2015 ?12?:?51? ?AM
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> Not everyones perspective is broad enough to understand how deep the i8042 controller
> workings are (still) ingrained into the kernel architecture to derive a simple answer.
It has absolutely nothing to do with the i8042 controller - this is just the question of logical reasoning.
Let’s look at the whole thing from the perspective of someone who is capable of thinking logically but for some reason has never used a “conventional” computer. If pressing the same key may produce different results in different sutuations one does not really need to be some kind of Einstein in order to realize that the results that you see must depend on some additional factors,right. What may these factors be like? Once keyboard happens to be the only source of input to the kbdclass’s input queue, do you really think one needs to be a genius in order to realize that the distinction between the lower and upper cases for a given key must be somehow dependent on the keys that have been pressed earlier???
This is how someone who had never used a PC would think like. However, the OP apparently is not new to a PC, so that he must know (solely from the user’s perspective) that the case depends on the state of Shift and CapsLock keys. However, he is still “surprized” to see exactly the same scancodes for upper and lower case letters.
In other words, I am 100% with Chris here…
Anton Bassov
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