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