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

PCIe and Graphics

PCI Express Root Port 26

PCI Express Root Port 26 firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x1588
Records
34
Path
Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 26

Record 4126

PCI Express Root Port 26

Firmware Value

Control the PCI Express Root Port.

Opcode
OneOf
Question ID
0xf16
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x118
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Record 4127

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
0xf17
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x380
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Built-in
1SlotStandard default

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}
  • {"condition_id": 1658, "type": "GrayOutIf", "offset": 507446, "expr": ["EqIdVal QuestionId: 0xF24, Value: 0x1"]}

Record 4128

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
0x15f9
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x134
Width
1 byte(s)
Range
0 to 4 step 0
ValueLabelMarkers
0DisabledStandard default
2L1
4Auto

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4129

L1 Substates

Firmware Value

PCI Express L1 Substates settings.

Opcode
OneOf
Question ID
0x1615
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2d8
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1L1.1
2L1.1 & L1.2

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4130

L1 Low

Firmware Value

PCI Express L1 Low Substate Enable/Disable.

Opcode
OneOf
Question ID
0xf18
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2f4
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4131

ACS

Firmware Value

Enable/Disable Access Control Services Extended Capability

Opcode
OneOf
Question ID
0xf19
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x310
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4132

PTM

Firmware Value

Enable/Disable Precision Time Measurement

Opcode
OneOf
Question ID
0x1631
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x32c
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4133

DPC

Firmware Value

Enable/Disable Downstream Port Containment

Opcode
OneOf
Question ID
0xf1a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x348
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4134

EDPC

Firmware Value

Enable/Disable Rootport extensions for Downstream Port Containment

Opcode
OneOf
Question ID
0xf1b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x364
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4135

URR

Firmware Value

PCI Express Unsupported Request Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xf1c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x150
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4136

FER

Firmware Value

PCI Express Device Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xf1d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x16c
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4137

NFER

Firmware Value

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

Opcode
OneOf
Question ID
0xf1e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x188
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4138

CER

Firmware Value

PCI Express Device Correctable Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xf1f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1a4
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4139

SEFE

Firmware Value

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

Opcode
OneOf
Question ID
0xf20
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1f8
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4140

SENFE

Firmware Value

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

Opcode
OneOf
Question ID
0xf21
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x214
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4141

SECE

Firmware Value

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

Opcode
OneOf
Question ID
0xf22
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x230
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4142

PME SCI

Firmware Value

PCI Express PME SCI Enable/Disable.

Opcode
OneOf
Question ID
0xf23
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x24c
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4143

Hot Plug

Firmware Value

PCI Express Hot Plug Enable/Disable.

Opcode
OneOf
Question ID
0xf24
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x268
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}
  • {"condition_id": 1659, "type": "GrayOutIf", "offset": 507998, "expr": ["EqIdVal QuestionId: 0xF17, Value: 0x0"]}

Record 4144

Advanced Error Reporting

Firmware Value

Advanced Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xf25
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x284
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4145

PCIe Speed

Firmware Value

Configure PCIe Speed

Opcode
OneOf
Question ID
0xf26
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2a0
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0AutoStandard default
1Gen1
2Gen2
3Gen3

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4146

Transmitter Half Swing

Firmware Value

Transmitter Half Swing Enable/Disable.

Opcode
OneOf
Question ID
0xf27
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2bc
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4147

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
0xf28
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3b5
Width
2 byte(s)
Range
0 to 65535 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4148

Extra Bus Reserved

Firmware Value

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

Opcode
Numeric
Question ID
0xf29
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x538
Width
1 byte(s)
Range
0 to 7 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4149

Reserved Memory

Firmware Value

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

Opcode
Numeric
Question ID
0xf2a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x56d
Width
2 byte(s)
Range
1 to 20 step 1

Default store records

Store IDStore labelValueOption label
0Standard10

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4150

Reserved I/O

Firmware Value

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

Opcode
Numeric
Question ID
0xf2b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x58c
Width
1 byte(s)
Range
4 to 20 step 4

Default store records

Store IDStore labelValueOption label
0Standard4

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4151

LTR

Firmware Value

PCH PCIE Latency Reporting Enable/Disable

Opcode
OneOf
Question ID
0xf2c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3fc
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4152

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
0xf2d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x434
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}
  • {"condition_id": 1660, "type": "SuppressIf", "offset": 508313, "expr": ["EqIdVal QuestionId: 0xF2C, Value: 0x0"]}

Record 4153

Snoop Latency Value

Firmware Value

LTR Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xf2e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4bd
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}
  • {"condition_id": 1660, "type": "SuppressIf", "offset": 508313, "expr": ["EqIdVal QuestionId: 0xF2C, Value: 0x0"]}
  • {"condition_id": 1661, "type": "SuppressIf", "offset": 508361, "expr": ["EqIdVal QuestionId: 0xF2D, Value: 0x1", "Not"]}

Record 4154

Snoop Latency Multiplier

Firmware Value

LTR Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xf2f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x450
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": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}
  • {"condition_id": 1660, "type": "SuppressIf", "offset": 508313, "expr": ["EqIdVal QuestionId: 0xF2C, Value: 0x0"]}
  • {"condition_id": 1661, "type": "SuppressIf", "offset": 508361, "expr": ["EqIdVal QuestionId: 0xF2D, Value: 0x1", "Not"]}

Record 4155

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
0xf30
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x46c
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}
  • {"condition_id": 1660, "type": "SuppressIf", "offset": 508313, "expr": ["EqIdVal QuestionId: 0xF2C, Value: 0x0"]}

Record 4156

Non Snoop Latency Value

Firmware Value

LTR Non Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xf31
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4f5
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}
  • {"condition_id": 1660, "type": "SuppressIf", "offset": 508313, "expr": ["EqIdVal QuestionId: 0xF2C, Value: 0x0"]}
  • {"condition_id": 1662, "type": "SuppressIf", "offset": 508505, "expr": ["EqIdVal QuestionId: 0xF30, Value: 0x1", "Not"]}

Record 4157

Non Snoop Latency Multiplier

Firmware Value

LTR Non Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xf32
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x488
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": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}
  • {"condition_id": 1660, "type": "SuppressIf", "offset": 508313, "expr": ["EqIdVal QuestionId: 0xF2C, Value: 0x0"]}
  • {"condition_id": 1662, "type": "SuppressIf", "offset": 508505, "expr": ["EqIdVal QuestionId: 0xF30, Value: 0x1", "Not"]}

Record 4158

LTR Lock

Firmware Value

PCIE LTR Configuration Lock

Opcode
OneOf
Question ID
0xf33
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x418
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}

Record 4159

Peer Memory Write Enable

Firmware Value

Peer Memory Write Enable/Disable

Opcode
OneOf
Question ID
0xf34
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0xd7
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1657, "type": "SuppressIf", "offset": 507438, "expr": ["EqIdVal QuestionId: 0xF16, Value: 0x0"]}