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

[Hans de Goede <hdegoede@redhat.com>]

Hi James,

On 10/1/23 16:16, James John wrote:
> Hello Hans,
> 
> Thank you. I applied the patch and I have the inputs attached here.
> 
> After setting the hwdb filter, all the hot keys are still working except that the LED notification light on Mute Hotkey (F9) is no longer turning up on mute.
> 
> The Screen Capture, Disable Camera, and MyASUS buttons are not mapped yet. I believe the Screen Capture button should map to PrntScrn button, and MyASUS with Disable Camera unmapped, obviously. I also have the codes in the attached log.
> 
> Screen Capture button is KEY_UNKNOWN to evtest.

So I missed the Screen Capture button so far.
I believe that the 0x2a code should be mapped to
KEY_SELECTIVE_SCREENSHOT (to differentiate it from
the printscreen key, this is also used on other laptops
for similar buttons).

I'm going to send out a RFC series of 3 patches,
the 2 patches which I send earlier + a patch to
add a mapping for this. I'll Cc you on this.

Please give this series a try (after removing the hwdb
change).

Regards,

Hans





> On 01/10/2023 13:45, Hans de Goede wrote:
>> Hi James,
>>
>> On 10/1/23 10:46, James John wrote:
>>> Hello Han,
>>>
>>> Thank you very much for this detailed steps. I was able to reproduce this with "evtest" and everything went okay.
>>>
>>> After editing /lib/udev/hwdb.d/60-keyboarrd.hwdb as you specified, the problem has been fixed, which I believe should revert on reboot?
>> No this will fix it until /lib/udev/hwdb.d/60-keyboarrd.hwdb gets overwritten by your
>> package-manager the next time the systemd packages get updated.
>>
>>> This is the content of /sys/class/dmi/id/modalias
>>>
>>> dmi:bvnAmericanMegatrendsInternational,LLC.:bvrUX5304VA.304:bd05/16/2023:br5.27:svnASUSTeKCOMPUTERINC.:pnZenbookS13UX5304VA_UX5304VA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX5304VA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:
>> Thanks.
>>
>> Looking at:
>> https://bbs.archlinux.org/viewtopic.php?pid=2123716
>>
>> I see that at least one other model Asus laptop is affected too. So rather then
>> adding a more specific hwdb rule for your model I would like to try and find
>> the root cause of these 0x20 event code events when pressing capslock
>> on your laptop.
>>
>>> Yes, I built my kernel. I wish I could parse this and write a proper quirk.
>> Good, I've written a small kernel patch to get to the bottom of this (attached)
>> can you please build a kernel with this. Then boot into this kernel and
>> then run dmesg -w
>>
>> When you now press capslock you should see log lines show up which contain
>> "raw event code 0x..."
>>
>> Please let me know what these lines show when pressing capslock.
>>
>> Please also let me know what these lines show when pressing other
>> hotkeys which are handled by asus-nb-wmi (you can re-run "sudo evtest"
>> to check which keys that are).
>>
>> I think the issue might be that the asus-wmi code is filtering out
>> the higher bits of the value, which causes some new events to
>> get mapped as just 0x20 instead of some-higher-bits + 0x20.
>>
>> Also I'm wondering if everything else works as it should,
>> e.g. does changing the brightness with the brightness hotkeys
>> still work after setting up the hwdb filtering ?
>>
>> And does the lid-switch (suspend the machine when the lid is closed)
>> work ?
>>
>>
>>> Also, I don't know if this is related; the hotkeys should be enabled by default. Fn key should be for Function keys. But in the current state, it is reversed.
>> This is laptop models specific and not really controlled by Linux,
>> sometimes you can change the default in the BIOS. Or sometimes you
>> can change the default by pressing Fn + Esc.
>>
>> Regards,
>>
>> Hans
>>
>>
>>
>>
>>> On 01/10/2023 09:28, Hans de Goede wrote:
>>>> 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
>>>>