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

PCIe and Graphics

PCI Express Root Port 18

PCI Express Root Port 18 firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x13f5
Records
34
Path
Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 18

Record 3854

PCI Express Root Port 18

Firmware Value

Control the PCI Express Root Port.

Opcode
OneOf
Question ID
0xe1e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x110
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Record 3855

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
0xe1f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x378
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Built-in
1SlotStandard default

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}
  • {"condition_id": 1610, "type": "GrayOutIf", "offset": 497118, "expr": ["EqIdVal QuestionId: 0xE2C, Value: 0x1"]}

Record 3856

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
0x15f1
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x12c
Width
1 byte(s)
Range
0 to 4 step 0
ValueLabelMarkers
0DisabledStandard default
2L1
4Auto

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3857

L1 Substates

Firmware Value

PCI Express L1 Substates settings.

Opcode
OneOf
Question ID
0x160d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2d0
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1L1.1
2L1.1 & L1.2

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3858

L1 Low

Firmware Value

PCI Express L1 Low Substate Enable/Disable.

Opcode
OneOf
Question ID
0xe20
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2ec
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3859

ACS

Firmware Value

Enable/Disable Access Control Services Extended Capability

Opcode
OneOf
Question ID
0xe21
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x308
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3860

PTM

Firmware Value

Enable/Disable Precision Time Measurement

Opcode
OneOf
Question ID
0x1629
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x324
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3861

DPC

Firmware Value

Enable/Disable Downstream Port Containment

Opcode
OneOf
Question ID
0xe22
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x340
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3862

EDPC

Firmware Value

Enable/Disable Rootport extensions for Downstream Port Containment

Opcode
OneOf
Question ID
0xe23
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x35c
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3863

URR

Firmware Value

PCI Express Unsupported Request Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xe24
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x148
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3864

FER

Firmware Value

PCI Express Device Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xe25
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x164
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3865

NFER

Firmware Value

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

Opcode
OneOf
Question ID
0xe26
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x180
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3866

CER

Firmware Value

PCI Express Device Correctable Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xe27
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x19c
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3867

SEFE

Firmware Value

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

Opcode
OneOf
Question ID
0xe28
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1f0
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3868

SENFE

Firmware Value

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

Opcode
OneOf
Question ID
0xe29
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x20c
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3869

SECE

Firmware Value

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

Opcode
OneOf
Question ID
0xe2a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x228
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3870

PME SCI

Firmware Value

PCI Express PME SCI Enable/Disable.

Opcode
OneOf
Question ID
0xe2b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x244
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3871

Hot Plug

Firmware Value

PCI Express Hot Plug Enable/Disable.

Opcode
OneOf
Question ID
0xe2c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x260
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}
  • {"condition_id": 1611, "type": "GrayOutIf", "offset": 497670, "expr": ["EqIdVal QuestionId: 0xE1F, Value: 0x0"]}

Record 3872

Advanced Error Reporting

Firmware Value

Advanced Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xe2d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x27c
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3873

PCIe Speed

Firmware Value

Configure PCIe Speed

Opcode
OneOf
Question ID
0xe2e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x298
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0AutoStandard default
1Gen1
2Gen2
3Gen3

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3874

Transmitter Half Swing

Firmware Value

Transmitter Half Swing Enable/Disable.

Opcode
OneOf
Question ID
0xe2f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2b4
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3875

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
0xe30
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3a5
Width
2 byte(s)
Range
0 to 65535 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3876

Extra Bus Reserved

Firmware Value

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

Opcode
Numeric
Question ID
0xe31
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x530
Width
1 byte(s)
Range
0 to 7 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3877

Reserved Memory

Firmware Value

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

Opcode
Numeric
Question ID
0xe32
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x55d
Width
2 byte(s)
Range
1 to 20 step 1

Default store records

Store IDStore labelValueOption label
0Standard10

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3878

Reserved I/O

Firmware Value

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

Opcode
Numeric
Question ID
0xe33
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x584
Width
1 byte(s)
Range
4 to 20 step 4

Default store records

Store IDStore labelValueOption label
0Standard4

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3879

LTR

Firmware Value

PCH PCIE Latency Reporting Enable/Disable

Opcode
OneOf
Question ID
0xe34
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3f4
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3880

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
0xe35
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x42c
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}
  • {"condition_id": 1612, "type": "SuppressIf", "offset": 497985, "expr": ["EqIdVal QuestionId: 0xE34, Value: 0x0"]}

Record 3881

Snoop Latency Value

Firmware Value

LTR Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xe36
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4ad
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}
  • {"condition_id": 1612, "type": "SuppressIf", "offset": 497985, "expr": ["EqIdVal QuestionId: 0xE34, Value: 0x0"]}
  • {"condition_id": 1613, "type": "SuppressIf", "offset": 498033, "expr": ["EqIdVal QuestionId: 0xE35, Value: 0x1", "Not"]}

Record 3882

Snoop Latency Multiplier

Firmware Value

LTR Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xe37
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x448
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": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}
  • {"condition_id": 1612, "type": "SuppressIf", "offset": 497985, "expr": ["EqIdVal QuestionId: 0xE34, Value: 0x0"]}
  • {"condition_id": 1613, "type": "SuppressIf", "offset": 498033, "expr": ["EqIdVal QuestionId: 0xE35, Value: 0x1", "Not"]}

Record 3883

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
0xe38
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x464
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}
  • {"condition_id": 1612, "type": "SuppressIf", "offset": 497985, "expr": ["EqIdVal QuestionId: 0xE34, Value: 0x0"]}

Record 3884

Non Snoop Latency Value

Firmware Value

LTR Non Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xe39
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4e5
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}
  • {"condition_id": 1612, "type": "SuppressIf", "offset": 497985, "expr": ["EqIdVal QuestionId: 0xE34, Value: 0x0"]}
  • {"condition_id": 1614, "type": "SuppressIf", "offset": 498177, "expr": ["EqIdVal QuestionId: 0xE38, Value: 0x1", "Not"]}

Record 3885

Non Snoop Latency Multiplier

Firmware Value

LTR Non Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xe3a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x480
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": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}
  • {"condition_id": 1612, "type": "SuppressIf", "offset": 497985, "expr": ["EqIdVal QuestionId: 0xE34, Value: 0x0"]}
  • {"condition_id": 1614, "type": "SuppressIf", "offset": 498177, "expr": ["EqIdVal QuestionId: 0xE38, Value: 0x1", "Not"]}

Record 3886

LTR Lock

Firmware Value

PCIE LTR Configuration Lock

Opcode
OneOf
Question ID
0xe3b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x410
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}

Record 3887

Peer Memory Write Enable

Firmware Value

Peer Memory Write Enable/Disable

Opcode
OneOf
Question ID
0xe3c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0xcf
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]}