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

PCIe and Graphics

PCI Express Root Port 24

PCI Express Root Port 24 firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x157f
Records
34
Path
Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 24

Record 4058

PCI Express Root Port 24

Firmware Value

Control the PCI Express Root Port.

Opcode
OneOf
Question ID
0xed8
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x116
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Record 4059

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
0xed9
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x37e
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Built-in
1SlotStandard default

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}
  • {"condition_id": 1646, "type": "GrayOutIf", "offset": 504864, "expr": ["EqIdVal QuestionId: 0xEE6, Value: 0x1"]}

Record 4060

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
0x15f7
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x132
Width
1 byte(s)
Range
0 to 4 step 0
ValueLabelMarkers
0DisabledStandard default
2L1
4Auto

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4061

L1 Substates

Firmware Value

PCI Express L1 Substates settings.

Opcode
OneOf
Question ID
0x1613
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2d6
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1L1.1
2L1.1 & L1.2

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4062

L1 Low

Firmware Value

PCI Express L1 Low Substate Enable/Disable.

Opcode
OneOf
Question ID
0xeda
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2f2
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4063

ACS

Firmware Value

Enable/Disable Access Control Services Extended Capability

Opcode
OneOf
Question ID
0xedb
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x30e
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4064

PTM

Firmware Value

Enable/Disable Precision Time Measurement

Opcode
OneOf
Question ID
0x162f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x32a
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4065

DPC

Firmware Value

Enable/Disable Downstream Port Containment

Opcode
OneOf
Question ID
0xedc
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x346
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4066

EDPC

Firmware Value

Enable/Disable Rootport extensions for Downstream Port Containment

Opcode
OneOf
Question ID
0xedd
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x362
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4067

URR

Firmware Value

PCI Express Unsupported Request Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xede
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x14e
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4068

FER

Firmware Value

PCI Express Device Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xedf
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x16a
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4069

NFER

Firmware Value

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

Opcode
OneOf
Question ID
0xee0
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x186
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4070

CER

Firmware Value

PCI Express Device Correctable Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xee1
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1a2
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4071

SEFE

Firmware Value

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

Opcode
OneOf
Question ID
0xee2
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1f6
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4072

SENFE

Firmware Value

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

Opcode
OneOf
Question ID
0xee3
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x212
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4073

SECE

Firmware Value

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

Opcode
OneOf
Question ID
0xee4
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x22e
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4074

PME SCI

Firmware Value

PCI Express PME SCI Enable/Disable.

Opcode
OneOf
Question ID
0xee5
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x24a
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4075

Hot Plug

Firmware Value

PCI Express Hot Plug Enable/Disable.

Opcode
OneOf
Question ID
0xee6
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x266
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}
  • {"condition_id": 1647, "type": "GrayOutIf", "offset": 505416, "expr": ["EqIdVal QuestionId: 0xED9, Value: 0x0"]}

Record 4076

Advanced Error Reporting

Firmware Value

Advanced Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xee7
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x282
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4077

PCIe Speed

Firmware Value

Configure PCIe Speed

Opcode
OneOf
Question ID
0xee8
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x29e
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0AutoStandard default
1Gen1
2Gen2
3Gen3

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4078

Transmitter Half Swing

Firmware Value

Transmitter Half Swing Enable/Disable.

Opcode
OneOf
Question ID
0xee9
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2ba
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4079

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
0xeea
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3b1
Width
2 byte(s)
Range
0 to 65535 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4080

Extra Bus Reserved

Firmware Value

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

Opcode
Numeric
Question ID
0xeeb
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x536
Width
1 byte(s)
Range
0 to 7 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4081

Reserved Memory

Firmware Value

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

Opcode
Numeric
Question ID
0xeec
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x569
Width
2 byte(s)
Range
1 to 20 step 1

Default store records

Store IDStore labelValueOption label
0Standard10

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4082

Reserved I/O

Firmware Value

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

Opcode
Numeric
Question ID
0xeed
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x58a
Width
1 byte(s)
Range
4 to 20 step 4

Default store records

Store IDStore labelValueOption label
0Standard4

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4083

LTR

Firmware Value

PCH PCIE Latency Reporting Enable/Disable

Opcode
OneOf
Question ID
0xeee
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3fa
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4084

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
0xeef
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x432
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}
  • {"condition_id": 1648, "type": "SuppressIf", "offset": 505731, "expr": ["EqIdVal QuestionId: 0xEEE, Value: 0x0"]}

Record 4085

Snoop Latency Value

Firmware Value

LTR Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xef0
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4b9
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}
  • {"condition_id": 1648, "type": "SuppressIf", "offset": 505731, "expr": ["EqIdVal QuestionId: 0xEEE, Value: 0x0"]}
  • {"condition_id": 1649, "type": "SuppressIf", "offset": 505779, "expr": ["EqIdVal QuestionId: 0xEEF, Value: 0x1", "Not"]}

Record 4086

Snoop Latency Multiplier

Firmware Value

LTR Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xef1
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x44e
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": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}
  • {"condition_id": 1648, "type": "SuppressIf", "offset": 505731, "expr": ["EqIdVal QuestionId: 0xEEE, Value: 0x0"]}
  • {"condition_id": 1649, "type": "SuppressIf", "offset": 505779, "expr": ["EqIdVal QuestionId: 0xEEF, Value: 0x1", "Not"]}

Record 4087

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
0xef2
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x46a
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}
  • {"condition_id": 1648, "type": "SuppressIf", "offset": 505731, "expr": ["EqIdVal QuestionId: 0xEEE, Value: 0x0"]}

Record 4088

Non Snoop Latency Value

Firmware Value

LTR Non Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xef3
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4f1
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}
  • {"condition_id": 1648, "type": "SuppressIf", "offset": 505731, "expr": ["EqIdVal QuestionId: 0xEEE, Value: 0x0"]}
  • {"condition_id": 1650, "type": "SuppressIf", "offset": 505923, "expr": ["EqIdVal QuestionId: 0xEF2, Value: 0x1", "Not"]}

Record 4089

Non Snoop Latency Multiplier

Firmware Value

LTR Non Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xef4
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x486
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": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}
  • {"condition_id": 1648, "type": "SuppressIf", "offset": 505731, "expr": ["EqIdVal QuestionId: 0xEEE, Value: 0x0"]}
  • {"condition_id": 1650, "type": "SuppressIf", "offset": 505923, "expr": ["EqIdVal QuestionId: 0xEF2, Value: 0x1", "Not"]}

Record 4090

LTR Lock

Firmware Value

PCIE LTR Configuration Lock

Opcode
OneOf
Question ID
0xef5
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x416
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}

Record 4091

Peer Memory Write Enable

Firmware Value

Peer Memory Write Enable/Disable

Opcode
OneOf
Question ID
0xef6
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0xd5
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1645, "type": "SuppressIf", "offset": 504856, "expr": ["EqIdVal QuestionId: 0xED8, Value: 0x0"]}