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

PCIe and Graphics

PCI Express Root Port 5

PCI Express Root Port 5 firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x1037
Records
34
Path
Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 5

Record 3412

PCI Express Root Port 5

Firmware Value

Control the PCI Express Root Port.

Opcode
OneOf
Question ID
0xc8b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x103
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Record 3413

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
0xc8c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x36b
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Built-in
1SlotStandard default

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}
  • {"condition_id": 1532, "type": "GrayOutIf", "offset": 480335, "expr": ["EqIdVal QuestionId: 0xC99, Value: 0x1"]}

Record 3414

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
0x15e4
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x11f
Width
1 byte(s)
Range
0 to 4 step 0
ValueLabelMarkers
0DisabledStandard default
2L1
4Auto

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3415

L1 Substates

Firmware Value

PCI Express L1 Substates settings.

Opcode
OneOf
Question ID
0x1600
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2c3
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1L1.1
2L1.1 & L1.2

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3416

L1 Low

Firmware Value

PCI Express L1 Low Substate Enable/Disable.

Opcode
OneOf
Question ID
0xc8d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2df
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3417

ACS

Firmware Value

Enable/Disable Access Control Services Extended Capability

Opcode
OneOf
Question ID
0xc8e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2fb
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3418

PTM

Firmware Value

Enable/Disable Precision Time Measurement

Opcode
OneOf
Question ID
0x161c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x317
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3419

DPC

Firmware Value

Enable/Disable Downstream Port Containment

Opcode
OneOf
Question ID
0xc8f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x333
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3420

EDPC

Firmware Value

Enable/Disable Rootport extensions for Downstream Port Containment

Opcode
OneOf
Question ID
0xc90
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x34f
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3421

URR

Firmware Value

PCI Express Unsupported Request Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xc91
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x13b
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3422

FER

Firmware Value

PCI Express Device Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xc92
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x157
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3423

NFER

Firmware Value

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

Opcode
OneOf
Question ID
0xc93
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x173
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3424

CER

Firmware Value

PCI Express Device Correctable Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xc94
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x18f
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3425

SEFE

Firmware Value

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

Opcode
OneOf
Question ID
0xc95
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1e3
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3426

SENFE

Firmware Value

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

Opcode
OneOf
Question ID
0xc96
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1ff
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3427

SECE

Firmware Value

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

Opcode
OneOf
Question ID
0xc97
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x21b
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3428

PME SCI

Firmware Value

PCI Express PME SCI Enable/Disable.

Opcode
OneOf
Question ID
0xc98
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x237
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3429

Hot Plug

Firmware Value

PCI Express Hot Plug Enable/Disable.

Opcode
OneOf
Question ID
0xc99
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x253
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}
  • {"condition_id": 1533, "type": "GrayOutIf", "offset": 480887, "expr": ["EqIdVal QuestionId: 0xC8C, Value: 0x0"]}

Record 3430

Advanced Error Reporting

Firmware Value

Advanced Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xc9a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x26f
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3431

PCIe Speed

Firmware Value

Configure PCIe Speed

Opcode
OneOf
Question ID
0xc9b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x28b
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0AutoStandard default
1Gen1
2Gen2
3Gen3

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3432

Transmitter Half Swing

Firmware Value

Transmitter Half Swing Enable/Disable.

Opcode
OneOf
Question ID
0xc9c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2a7
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3433

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
0xc9d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x38b
Width
2 byte(s)
Range
0 to 65535 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3434

Extra Bus Reserved

Firmware Value

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

Opcode
Numeric
Question ID
0xc9e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x523
Width
1 byte(s)
Range
0 to 7 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3435

Reserved Memory

Firmware Value

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

Opcode
Numeric
Question ID
0xc9f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x543
Width
2 byte(s)
Range
1 to 20 step 1

Default store records

Store IDStore labelValueOption label
0Standard10

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3436

Reserved I/O

Firmware Value

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

Opcode
Numeric
Question ID
0xca0
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x577
Width
1 byte(s)
Range
4 to 20 step 4

Default store records

Store IDStore labelValueOption label
0Standard4

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3437

LTR

Firmware Value

PCH PCIE Latency Reporting Enable/Disable

Opcode
OneOf
Question ID
0xca1
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3e7
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3438

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
0xca2
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x41f
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}
  • {"condition_id": 1534, "type": "SuppressIf", "offset": 481202, "expr": ["EqIdVal QuestionId: 0xCA1, Value: 0x0"]}

Record 3439

Snoop Latency Value

Firmware Value

LTR Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xca3
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x493
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}
  • {"condition_id": 1534, "type": "SuppressIf", "offset": 481202, "expr": ["EqIdVal QuestionId: 0xCA1, Value: 0x0"]}
  • {"condition_id": 1535, "type": "SuppressIf", "offset": 481250, "expr": ["EqIdVal QuestionId: 0xCA2, Value: 0x1", "Not"]}

Record 3440

Snoop Latency Multiplier

Firmware Value

LTR Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xca4
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x43b
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": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}
  • {"condition_id": 1534, "type": "SuppressIf", "offset": 481202, "expr": ["EqIdVal QuestionId: 0xCA1, Value: 0x0"]}
  • {"condition_id": 1535, "type": "SuppressIf", "offset": 481250, "expr": ["EqIdVal QuestionId: 0xCA2, Value: 0x1", "Not"]}

Record 3441

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
0xca5
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x457
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}
  • {"condition_id": 1534, "type": "SuppressIf", "offset": 481202, "expr": ["EqIdVal QuestionId: 0xCA1, Value: 0x0"]}

Record 3442

Non Snoop Latency Value

Firmware Value

LTR Non Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xca6
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4cb
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}
  • {"condition_id": 1534, "type": "SuppressIf", "offset": 481202, "expr": ["EqIdVal QuestionId: 0xCA1, Value: 0x0"]}
  • {"condition_id": 1536, "type": "SuppressIf", "offset": 481394, "expr": ["EqIdVal QuestionId: 0xCA5, Value: 0x1", "Not"]}

Record 3443

Non Snoop Latency Multiplier

Firmware Value

LTR Non Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xca7
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x473
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": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}
  • {"condition_id": 1534, "type": "SuppressIf", "offset": 481202, "expr": ["EqIdVal QuestionId: 0xCA1, Value: 0x0"]}
  • {"condition_id": 1536, "type": "SuppressIf", "offset": 481394, "expr": ["EqIdVal QuestionId: 0xCA5, Value: 0x1", "Not"]}

Record 3444

LTR Lock

Firmware Value

PCIE LTR Configuration Lock

Opcode
OneOf
Question ID
0xca8
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x403
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}

Record 3445

Peer Memory Write Enable

Firmware Value

Peer Memory Write Enable/Disable

Opcode
OneOf
Question ID
0xca9
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0xc2
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1531, "type": "SuppressIf", "offset": 480327, "expr": ["EqIdVal QuestionId: 0xC8B, Value: 0x0"]}