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Subject: Re: i8042_init: PS/2 mouse not detected with ACPIPnP/PnPBIOS
To:     "Rafael J. Wysocki" <rafael@kernel.org>
Cc:     Dmitry Torokhov <dmitry.torokhov@gmail.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        Len Brown <lenb@kernel.org>, linux-input@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
        Hans de Goede <hdegoede@redhat.com>
References: <1a69c5bc-ccc4-68db-7871-af05a70052c9@molgen.mpg.de>
 <20201007221628.GW1009802@dtor-ws>
 <bbb70981-1242-0aea-01c9-f9507f8eae3b@molgen.mpg.de>
 <CAJZ5v0hKmESo0-kfN1+vK7to05GpVV3d7ZnO3XEsQ2jKKhvkJQ@mail.gmail.com>
From:   Paul Menzel <pmenzel@molgen.mpg.de>
Message-ID: <7921b792-c99a-659c-730f-ecb25cb7f04b@molgen.mpg.de>
Date:   Mon, 12 Oct 2020 12:50:40 +0200
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Dear Rafael,


Am 12.10.20 um 12:39 schrieb Rafael J. Wysocki:
> On Sun, Oct 11, 2020 at 1:08 AM Paul Menzel <pmenzel@molgen.mpg.de> wrote:
>>
>> Dear Dmitry, dear Rafael, dear Len,
>>
>>
>> Am 08.10.20 um 00:16 schrieb Dmitry Torokhov:
>>
>>> On Wed, Oct 07, 2020 at 11:18:41PM +0200, Paul Menzel wrote:
>>
>>>> On the Asus F2A85-M PRO Linux 5.9-rc8 (and previous versions) does not
>>>> recognize a plugged in PS/2 mouse using the Plug & Play method. The PS/2
>>>> keyboard is detected fine, and using `i8042.nopnp`, the PS/2 mouse also
>>>> works.
>>>>
>>>>> [    1.035915] calling  i8042_init+0x0/0x42d @ 1
>>>>> [    1.035947] i8042: PNP: PS/2 Controller [PNP0303:PS2K] at 0x60,0x64 irq 1
>>>>> [    1.035948] i8042: PNP: PS/2 appears to have AUX port disabled, if this is incorrect please boot with i8042.nopnp
>>>>> [    1.036589] serio: i8042 KBD port at 0x60,0x64 irq 1
>>>>> [    1.036621] initcall i8042_init+0x0/0x42d returned 0 after 687 usecs
>>>>
>>>> But, the DSDT includes the “mouse device”. From
>>>>
>>>>       acpidump > dump.bin; acpixtract dump.bin; iasl -d *dat; more dsdt.dsl
>>>>
>>>> we get
>>>>
>>>>                   Device (PS2M)
>>>>                   {
>>>>                       Name (_HID, EisaId ("PNP0F03") /* Microsoft PS/2-style Mouse */)  // _HID: Hardware ID
>>>>                       Name (_CID, EisaId ("PNP0F13") /* PS/2 Mouse */) // _CID: Compatible ID
>>>>                       Method (_STA, 0, NotSerialized)  // _STA: Status
>>>>                       {
>>>>                           If ((IOST & 0x4000))
>>>>                           {
>>>>                               Return (0x0F)
>>>>                           }
>>>>                           Else
>>>>                           {
>>>>                               Return (Zero)
>>>>                           }
>>>>                       }
>>>>
>>>> and the identifiers PNP0F03 and PNP0F13 are both listed in the array
>>>> `pnp_aux_devids[]`. But adding print statements to `i8042_pnp_aux_probe()`,
>>>> I do not see them, so the function does not seem to be called.
>>>
>>> My guess is that _STA returns 0 indicating that the device is not
>>> present. I would try tracking where IOST is being set and figuring out
>>> why it does not have mouse bit enabled.
>>
>> Does the ACPI subsystem allow to track, how ACPI variables(?) like IOST
>> are read and set?
> 
> My guess would be that IOST is a field in an operation region which
> would indicate that it is initialized by the bootstrap part of the
> BIOS.

Thank you for your answer. But how can I verify that? Is there a Linux 
kernel parameter, that would print it?


Kind regards,

Paul