linux-kernel - i8042_init: PS/2 mouse not detected with ACPIPnP/PnPBIOS

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Date:   Wed, 7 Oct 2020 23:18:41 +0200
From:   Paul Menzel <pmenzel@...gen.mpg.de>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:     linux-input@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: i8042_init: PS/2 mouse not detected with ACPIPnP/PnPBIOS

Dear Linux folks,


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.

Hints for further debugging are much appreciated.


Kind regards,

Paul