https://bugzilla.kernel.org/show_bug.cgi?id=209657

--- Comment #1 from Paul Menzel (pmenzel+bugzilla.kernel....@molgen.mpg.de) ---
The disassembled DSDT has:

```
[…]
    Name (IOST, 0x0401)

[…]
                Device (PS2K)
                {
                    Name (_HID, EisaId ("PNP0303") /* IBM Enhanced Keyboard
(101/102-key, PS/2 Mouse) */)
  // _HID: Hardware ID
                    Name (_CID, EisaId ("PNP030B"))  // _CID: Compatible ID
                    Method (_STA, 0, NotSerialized)  // _STA: Status
                    {
                        If ((IOST & 0x0400))
                        {
                            Return (0x0F)
                        }
                        Else
                        {
                            Return (Zero)
                        }
                    }
[…]
                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)
                        }
                    }
[…]
                    Method (_CRS, 0, NotSerialized)  // _CRS: Current Resource
Settings
                    {
                        If ((IOST & 0x0400))
                        {
                            Return (CRS1) /* \_SB_.PCI0.SBRG.PS2M.CRS1 */
                        }
                        Else
                        {
                            Return (CRS2) /* \_SB_.PCI0.SBRG.PS2M.CRS2 */
                        }
                    }
[…]
```

Is 0x0400 vs 0x4000 a typo?

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