i9 BIOS
Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026

PCIe and Graphics

PCI Express Root Port 23

PCI Express Root Port 23 firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x157e
Records
34
Path
Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 23

Record 4024

PCI Express Root Port 23

Firmware Value

Control the PCI Express Root Port.

Opcode
OneOf
Question ID
0xeb9
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x115
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Record 4025

Connection Type

Firmware Value

Built-In: a built-in device is connected to this rootport.

Firmware help text

Built-In: a built-in device is connected to this rootport. SlotImplemented bit will be clear. Slot: this rootport connects to user-accessible slot. SlotImplemented bit will be set.

Opcode
OneOf
Question ID
0xeba
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x37d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Built-in
1SlotStandard default

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}
  • {"condition_id": 1640, "type": "GrayOutIf", "offset": 503573, "expr": ["EqIdVal QuestionId: 0xEC7, Value: 0x1"]}

Record 4026

ASPM

Firmware Value

Set the ASPM Level: Force L0s - Force all links to L0s State AUTO - BIOS auto configure DISABLE - Disables ASPM

Firmware help text

Set the ASPM Level: Force L0s - Force all links to L0s State AUTO - BIOS auto configure DISABLE - Disables ASPM

Opcode
OneOf
Question ID
0x15f6
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x131
Width
1 byte(s)
Range
0 to 4 step 0
ValueLabelMarkers
0DisabledStandard default
2L1
4Auto

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4027

L1 Substates

Firmware Value

PCI Express L1 Substates settings.

Opcode
OneOf
Question ID
0x1612
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2d5
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1L1.1
2L1.1 & L1.2

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4028

L1 Low

Firmware Value

PCI Express L1 Low Substate Enable/Disable.

Opcode
OneOf
Question ID
0xebb
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2f1
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4029

ACS

Firmware Value

Enable/Disable Access Control Services Extended Capability

Opcode
OneOf
Question ID
0xebc
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x30d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4030

PTM

Firmware Value

Enable/Disable Precision Time Measurement

Opcode
OneOf
Question ID
0x162e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x329
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4031

DPC

Firmware Value

Enable/Disable Downstream Port Containment

Opcode
OneOf
Question ID
0xebd
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x345
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4032

EDPC

Firmware Value

Enable/Disable Rootport extensions for Downstream Port Containment

Opcode
OneOf
Question ID
0xebe
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x361
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4033

URR

Firmware Value

PCI Express Unsupported Request Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xebf
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x14d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4034

FER

Firmware Value

PCI Express Device Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xec0
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x169
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4035

NFER

Firmware Value

PCI Express Device Non-Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xec1
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x185
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4036

CER

Firmware Value

PCI Express Device Correctable Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xec2
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1a1
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4037

SEFE

Firmware Value

Root PCI Express System Error on Fatal Error Enable/Disable.

Opcode
OneOf
Question ID
0xec3
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1f5
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4038

SENFE

Firmware Value

Root PCI Express System Error on Non-Fatal Error Enable/Disable.

Opcode
OneOf
Question ID
0xec4
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x211
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4039

SECE

Firmware Value

Root PCI Express System Error on Correctable Error Enable/Disable.

Opcode
OneOf
Question ID
0xec5
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x22d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4040

PME SCI

Firmware Value

PCI Express PME SCI Enable/Disable.

Opcode
OneOf
Question ID
0xec6
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x249
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4041

Hot Plug

Firmware Value

PCI Express Hot Plug Enable/Disable.

Opcode
OneOf
Question ID
0xec7
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x265
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}
  • {"condition_id": 1641, "type": "GrayOutIf", "offset": 504125, "expr": ["EqIdVal QuestionId: 0xEBA, Value: 0x0"]}

Record 4042

Advanced Error Reporting

Firmware Value

Advanced Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xec8
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x281
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4043

PCIe Speed

Firmware Value

Configure PCIe Speed

Opcode
OneOf
Question ID
0xec9
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x29d
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0AutoStandard default
1Gen1
2Gen2
3Gen3

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4044

Transmitter Half Swing

Firmware Value

Transmitter Half Swing Enable/Disable.

Opcode
OneOf
Question ID
0xeca
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2b9
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4045

Detect Timeout

Firmware Value

The number of milliseconds reference code will wait for link to exit Detect state for enabled ports before assuming there is no device and potentially disabling the port.

Opcode
Numeric
Question ID
0xecb
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3af
Width
2 byte(s)
Range
0 to 65535 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4046

Extra Bus Reserved

Firmware Value

Extra Bus Reserved (0-7) for bridges behind this Root Bridge.

Opcode
Numeric
Question ID
0xecc
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x535
Width
1 byte(s)
Range
0 to 7 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4047

Reserved Memory

Firmware Value

Reserved Memory for this Root Bridge (1-20) MB

Opcode
Numeric
Question ID
0xecd
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x567
Width
2 byte(s)
Range
1 to 20 step 1

Default store records

Store IDStore labelValueOption label
0Standard10

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4048

Reserved I/O

Firmware Value

Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.

Opcode
Numeric
Question ID
0xece
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x589
Width
1 byte(s)
Range
4 to 20 step 4

Default store records

Store IDStore labelValueOption label
0Standard4

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4049

LTR

Firmware Value

PCH PCIE Latency Reporting Enable/Disable

Opcode
OneOf
Question ID
0xecf
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3f9
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4050

Snoop Latency Override

Firmware Value

Snoop Latency Override for PCH PCIE.

Firmware help text

Snoop Latency Override for PCH PCIE. Disabled: Disable override. Manual: Manually enter override values. Auto (default): Maintain default BIOS flow.

Opcode
OneOf
Question ID
0xed0
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x431
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}
  • {"condition_id": 1642, "type": "SuppressIf", "offset": 504440, "expr": ["EqIdVal QuestionId: 0xECF, Value: 0x0"]}

Record 4051

Snoop Latency Value

Firmware Value

LTR Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xed1
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4b7
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}
  • {"condition_id": 1642, "type": "SuppressIf", "offset": 504440, "expr": ["EqIdVal QuestionId: 0xECF, Value: 0x0"]}
  • {"condition_id": 1643, "type": "SuppressIf", "offset": 504488, "expr": ["EqIdVal QuestionId: 0xED0, Value: 0x1", "Not"]}

Record 4052

Snoop Latency Multiplier

Firmware Value

LTR Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xed2
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x44d
Width
1 byte(s)
Range
0 to 5 step 0
ValueLabelMarkers
01 ns
132 ns
21024 nsStandard defaultManufacturing default
332768 ns
41048576 ns
533554432 ns

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}
  • {"condition_id": 1642, "type": "SuppressIf", "offset": 504440, "expr": ["EqIdVal QuestionId: 0xECF, Value: 0x0"]}
  • {"condition_id": 1643, "type": "SuppressIf", "offset": 504488, "expr": ["EqIdVal QuestionId: 0xED0, Value: 0x1", "Not"]}

Record 4053

Non Snoop Latency Override

Firmware Value

Non Snoop Latency Override for PCH PCIE.

Firmware help text

Non Snoop Latency Override for PCH PCIE. Disabled: Disable override. Manual: Manually enter override values. Auto (default): Maintain default BIOS flow.

Opcode
OneOf
Question ID
0xed3
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x469
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}
  • {"condition_id": 1642, "type": "SuppressIf", "offset": 504440, "expr": ["EqIdVal QuestionId: 0xECF, Value: 0x0"]}

Record 4054

Non Snoop Latency Value

Firmware Value

LTR Non Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xed4
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4ef
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}
  • {"condition_id": 1642, "type": "SuppressIf", "offset": 504440, "expr": ["EqIdVal QuestionId: 0xECF, Value: 0x0"]}
  • {"condition_id": 1644, "type": "SuppressIf", "offset": 504632, "expr": ["EqIdVal QuestionId: 0xED3, Value: 0x1", "Not"]}

Record 4055

Non Snoop Latency Multiplier

Firmware Value

LTR Non Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xed5
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x485
Width
1 byte(s)
Range
0 to 5 step 0
ValueLabelMarkers
01 ns
132 ns
21024 nsStandard defaultManufacturing default
332768 ns
41048576 ns
533554432 ns

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}
  • {"condition_id": 1642, "type": "SuppressIf", "offset": 504440, "expr": ["EqIdVal QuestionId: 0xECF, Value: 0x0"]}
  • {"condition_id": 1644, "type": "SuppressIf", "offset": 504632, "expr": ["EqIdVal QuestionId: 0xED3, Value: 0x1", "Not"]}

Record 4056

LTR Lock

Firmware Value

PCIE LTR Configuration Lock

Opcode
OneOf
Question ID
0xed6
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x415
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}

Record 4057

Peer Memory Write Enable

Firmware Value

Peer Memory Write Enable/Disable

Opcode
OneOf
Question ID
0xed7
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0xd4
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1639, "type": "SuppressIf", "offset": 503565, "expr": ["EqIdVal QuestionId: 0xEB9, Value: 0x0"]}