linux-kernel - Re: PROBLEM: asus_nb_wmi sends KEY_BRIGHTNESSDOWN on pressing CAPS Lock and PrntScrn on Zenbook S 13 UX5304VA

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Message-ID: <132feb67-c147-7ee6-b337-385e11786ec6@redhat.com>
Date:   Sun, 1 Oct 2023 11:28:43 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     James John <me@...jajo.com>,
        Corentin Chary <corentin.chary@...il.com>,
        Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
        Mark Gross <markgross@...nel.org>
Cc:     platform-driver-x86@...r.kernel.org,
        acpi4asus-user@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: PROBLEM: asus_nb_wmi sends KEY_BRIGHTNESSDOWN on pressing CAPS
 Lock and PrntScrn on Zenbook S 13 UX5304VA

Hi James,

On 10/1/23 10:11, James John wrote:
> Hello,
> 
> First of all, thank you very much for the work you do with maintaining these drivers and supporting systems. It is not an easy one.
> 
> I have debugged this bug down to the asus_nb_wmi module. When I disable this module, the problem goes away, but then other hotkeys are not recognized. Attached is a debug event from libinput, where I pressed the capslock twice
> 
> I have tried to dabble around with asus-nb-wmi.c codes to see if I could fix it by luck, by adding UX5304VA to `static const struct dmi_system_id asus_quirks[]` but to no avail. And I have a very little knowledge of what "quirks" are.
> 
> I have attached some information regarding my hardware and kernel. I will be available to provide any more information that might be needed to resolve this.
> 
> A related open thread: https://bbs.archlinux.org/viewtopic.php?pid=2123716

First of all lets confirm that the KEY_BRIGHTNESSDOWN events are really coming from asus_nb_wmi.

Please install evtest and then run "sudo evtest" and then select the "Asus WMI hotkeys" device
by typing its number followed by enter.

After this reproduce the bug and see if the log shows KEY_BRIGHTNESSDOWN.

Since you said you tried playing around with the quirks, I assume you can build
your own kernel, please let me know if that is wrong.

If this confirms the KEY_BRIGHTNESSDOWN events are coming from the "Asus WMI hotkeys" device,
then please edit /lib/udev/hwdb.d/60-keyboard.hwdb

And search for "Asus WMI hotkeys", this should find this section:

evdev:name:Asus WMI hotkeys:dmi:bvn*:bvr*:bd*:svnASUS*:pn*:*
evdev:name:Eee PC WMI hotkeys:dmi:bvn*:bvr*:bd*:svnASUS*:pn*:*
evdev:name:Asus Laptop extra buttons:dmi:bvn*:bvr*:bd*:svnASUS*:pn*:*
 KEYBOARD_KEY_6b=f21                                    # Touchpad Toggle
 KEYBOARD_KEY_7c=f20                                    # Remap micmute to f20

Change this to:

evdev:name:Asus WMI hotkeys:dmi:bvn*:bvr*:bd*:svnASUS*:pn*:*
evdev:name:Eee PC WMI hotkeys:dmi:bvn*:bvr*:bd*:svnASUS*:pn*:*
evdev:name:Asus Laptop extra buttons:dmi:bvn*:bvr*:bd*:svnASUS*:pn*:*
 KEYBOARD_KEY_6b=f21                                    # Touchpad Toggle
 KEYBOARD_KEY_7c=f20                                    # Remap micmute to f20
 KEYBOARD_KEY_20=unknown

And then run "sudo udevadm hwdb --update" followed by "sudo udevadm trigger",
that should filter out the spurious keypresses.

If that helps, please run:

cat /sys/class/dmi/id/modalias

So that a proper DMI based quirk to only to the filtering on your model
can be written.

Regards,

Hans