Re: [PATCH v2] Input: atkbd - Skip ATKBD_CMD_GETID in translated mode

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Hi,

On 1/16/24 14:32, Barnabás Pőcze wrote:
> Hi
> 
> 
> 2024. január 16., kedd 10:34 keltezéssel, Hans de Goede írta:
> 
>> [...]
>>> 2023. november 15., szerda 18:46 keltezéssel, Hans de Goede írta:
>>>
>>>> There have been multiple reports of keyboard issues on recent laptop models
>>>> which can be worked around by setting i8042.dumbkbd, with the downside
>>>> being this breaks the capslock LED.
>>>>
>>>> It seems that these issues are caused by recent laptops getting confused by
>>>> ATKBD_CMD_GETID. Rather then adding and endless growing list of quirks for
>>>> this, just skip ATKBD_CMD_GETID alltogether on laptops in translated mode.
>>>>
>>>> The main goal of sending ATKBD_CMD_GETID is to skip binding to ps/2
>>>> mice/touchpads and those are never used in translated mode.
>>>>
>>>> Examples of laptop models which benefit from skipping ATKBD_CMD_GETID:
>>>>
>>>> * "HP Laptop 15s-fq2xxx", "HP laptop 15s-fq4xxx" and "HP Laptop 15-dy2xxx"
>>>>   models the kbd stops working for the first 2 - 5 minutes after boot
>>>>   (waiting for EC watchdog reset?)
>>>>
>>>> * On "HP Spectre x360 13-aw2xxx" atkbd fails to probe the keyboard
>>>>
>>>> * At least 9 different Lenovo models have issues with ATKBD_CMD_GETID, see:
>>>>   https://github.com/yescallop/atkbd-nogetid
>>>>
>>>> This has been tested on:
>>>>
>>>> 1. A MSI B550M PRO-VDH WIFI desktop, where the i8042 controller is not
>>>>    in translated mode when no keyboard is plugged in and with a ps/2 kbd
>>>>    a "AT Translated Set 2 keyboard" /dev/input/event# node shows up
>>>>
>>>> 2. A Lenovo ThinkPad X1 Yoga gen 8 (always has a translated set 2 keyboard)
>>>
>>> Just wanted to briefly mention that this broke my hwdb configuration because the
>>> version field of the device (as shown in `/proc/bus/input/devices`) has changed
>>> and it was included in the hwdb match rule.
>>
>> That is unfortunate. Was this a custom rule or one from
>> the hwdb shipped with systemd ?
>>
>> Either way can you share the match pattern of the rule before and
>> after? I want to check if there are any similar cases in
>> the hwdb shipped with systemd.
>> [...]
> 
> It was a custom rule.
> 
> Before:
> 
> evdev:input:b0011v0001p0001eAB83*
>  KEYBOARD_KEY_f8=fn
>  KEYBOARD_KEY_76=f21
> 
> I: Bus=0011 Vendor=0001 Product=0001 Version=ab83
> N: Name="AT Translated Set 2 keyboard"
> P: Phys=isa0060/serio0/input0
> S: Sysfs=/devices/platform/i8042/serio0/input/input4
> 
> 
> After:
> 
> evdev:input:b0011v0001p0001*
>  KEYBOARD_KEY_f8=fn
>  KEYBOARD_KEY_76=f21
> 
> I: Bus=0011 Vendor=0001 Product=0001 Version=abba
> N: Name="AT Translated Set 2 keyboard"
> P: Phys=isa0060/serio0/input0
> S: Sysfs=/devices/platform/i8042/serio0/input/input4

I see, thank you. There are no v0001p0001 matches
in the hwdb.d/60-keyboard.hwdb shipped with systems.

Typically laptop builtin keyboards use another match-type
so that they can do DMI matching e.g.:

evdev:atkbd:dmi:bvn*:bvr*:bd*:svnAcer*:pn*:*

So luckily for almost all users the e field in the match
rule changing should not be an issue. Sorry that this
was a problem for you.

Regards,

Hans





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