linux-kernel - Re: [PATCH] HID: apple: Reset quirks when Fn key is not found

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Date:   Mon, 30 May 2022 08:42:32 +0800
From:   Hilton Chain <hako@...rarare.space>
To:     José Expósito <jose.exposito89@...il.com>
Cc:     bryancain3@...il.com, jikos@...nel.org,
        benjamin.tissoires@...hat.com, linux-kernel@...r.kernel.org,
        linux-input@...r.kernel.org
Subject: Re: [PATCH] HID: apple: Reset quirks when Fn key is not found

Hi Jose,

> Reverting that commit will break battery reporting on the Magic
> Keyboards 2015 and 2021.
>
> When a keyboard has the APPLE_HAS_FN and another valid quirk, in this
> case APPLE_RDESC_BATTERY, setting asc->quirks = 0 (i.e., removing all
> quirks) also removes the valid ones.

Thanks for the explanation!

> My understanding of Bryan's patch (in cc) was that the new config option
> worked out of the box for Keychron and Apple keyboards and allowed for
> manual configuration where required.
>
> Could you explain a bit which bug is fixed by reverting these 2
> commits, please? I don't own a Keychron keyboard for testing, so it is
> not obvious to me why this change is required.

I own a GANSS keyboard which encounters this issue as well, related device
information given by `lsusb -v` below:

    idVendor           0x05ac Apple, Inc.
    idProduct          0x024f Aluminium Keyboard (ANSI)
    iManufacturer           1 SONiX
    iProduct                2 USB DEVICE

As I searching through, I found similar reports regarding another GANSS
model[1], and other brands like Varmilo[2] (a lot!) and Keychron. As a
common pattern, they mostly use 05ac:024f.

Currently I have two idea:

1. Modify Bryan's patch, so that fnmode default to 2 if device name not
starting with "Apple" (But I can't validate my assumption since I don't
own any Apple keyboards), I'll attach this patch in the next email.

2. Find out which quirk pattern solves this issue brute-forcely, I may
attach this patch later when I finally find a solution.

What's your opinion?

Stay boiled,
Hilton Chain

---
[1]: https://www.amazon.com/gp/customer-reviews/R1EV0B1FG21GGD
[2]: https://unix.stackexchange.com/questions/604791/keyboard-function-keys-always-trigger-media-shortcuts-regardless-of-whether-fn