Re: i8042_init: PS/2 mouse not detected with ACPIPnP/PnPBIOS

[Paul Menzel]

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@xxxxxxxxxxxxx> 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