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

PCIe and Graphics

PCI Express Root Port 19

PCI Express Root Port 19 firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x13f6
Records
34
Path
Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 19

Record 3888

PCI Express Root Port 19

Firmware Value

Control the PCI Express Root Port.

Opcode
OneOf
Question ID
0xe3d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x111
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Record 3889

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
0xe3e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x379
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Built-in
1SlotStandard default

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}
  • {"condition_id": 1616, "type": "GrayOutIf", "offset": 498409, "expr": ["EqIdVal QuestionId: 0xE4B, Value: 0x1"]}

Record 3890

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
0x15f2
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x12d
Width
1 byte(s)
Range
0 to 4 step 0
ValueLabelMarkers
0DisabledStandard default
2L1
4Auto

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3891

L1 Substates

Firmware Value

PCI Express L1 Substates settings.

Opcode
OneOf
Question ID
0x160e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2d1
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1L1.1
2L1.1 & L1.2

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3892

L1 Low

Firmware Value

PCI Express L1 Low Substate Enable/Disable.

Opcode
OneOf
Question ID
0xe3f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2ed
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3893

ACS

Firmware Value

Enable/Disable Access Control Services Extended Capability

Opcode
OneOf
Question ID
0xe40
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x309
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3894

PTM

Firmware Value

Enable/Disable Precision Time Measurement

Opcode
OneOf
Question ID
0x162a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x325
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3895

DPC

Firmware Value

Enable/Disable Downstream Port Containment

Opcode
OneOf
Question ID
0xe41
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x341
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3896

EDPC

Firmware Value

Enable/Disable Rootport extensions for Downstream Port Containment

Opcode
OneOf
Question ID
0xe42
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x35d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3897

URR

Firmware Value

PCI Express Unsupported Request Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xe43
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x149
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3898

FER

Firmware Value

PCI Express Device Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xe44
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x165
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3899

NFER

Firmware Value

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

Opcode
OneOf
Question ID
0xe45
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x181
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3900

CER

Firmware Value

PCI Express Device Correctable Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xe46
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x19d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3901

SEFE

Firmware Value

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

Opcode
OneOf
Question ID
0xe47
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1f1
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3902

SENFE

Firmware Value

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

Opcode
OneOf
Question ID
0xe48
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x20d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3903

SECE

Firmware Value

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

Opcode
OneOf
Question ID
0xe49
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x229
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3904

PME SCI

Firmware Value

PCI Express PME SCI Enable/Disable.

Opcode
OneOf
Question ID
0xe4a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x245
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3905

Hot Plug

Firmware Value

PCI Express Hot Plug Enable/Disable.

Opcode
OneOf
Question ID
0xe4b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x261
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}
  • {"condition_id": 1617, "type": "GrayOutIf", "offset": 498961, "expr": ["EqIdVal QuestionId: 0xE3E, Value: 0x0"]}

Record 3906

Advanced Error Reporting

Firmware Value

Advanced Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xe4c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x27d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3907

PCIe Speed

Firmware Value

Configure PCIe Speed

Opcode
OneOf
Question ID
0xe4d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x299
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0AutoStandard default
1Gen1
2Gen2
3Gen3

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3908

Transmitter Half Swing

Firmware Value

Transmitter Half Swing Enable/Disable.

Opcode
OneOf
Question ID
0xe4e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2b5
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3909

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
0xe4f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3a7
Width
2 byte(s)
Range
0 to 65535 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3910

Extra Bus Reserved

Firmware Value

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

Opcode
Numeric
Question ID
0xe50
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x531
Width
1 byte(s)
Range
0 to 7 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3911

Reserved Memory

Firmware Value

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

Opcode
Numeric
Question ID
0xe51
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x55f
Width
2 byte(s)
Range
1 to 20 step 1

Default store records

Store IDStore labelValueOption label
0Standard10

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3912

Reserved I/O

Firmware Value

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

Opcode
Numeric
Question ID
0xe52
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x585
Width
1 byte(s)
Range
4 to 20 step 4

Default store records

Store IDStore labelValueOption label
0Standard4

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3913

LTR

Firmware Value

PCH PCIE Latency Reporting Enable/Disable

Opcode
OneOf
Question ID
0xe53
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3f5
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3914

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
0xe54
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x42d
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}
  • {"condition_id": 1618, "type": "SuppressIf", "offset": 499276, "expr": ["EqIdVal QuestionId: 0xE53, Value: 0x0"]}

Record 3915

Snoop Latency Value

Firmware Value

LTR Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xe55
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4af
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}
  • {"condition_id": 1618, "type": "SuppressIf", "offset": 499276, "expr": ["EqIdVal QuestionId: 0xE53, Value: 0x0"]}
  • {"condition_id": 1619, "type": "SuppressIf", "offset": 499324, "expr": ["EqIdVal QuestionId: 0xE54, Value: 0x1", "Not"]}

Record 3916

Snoop Latency Multiplier

Firmware Value

LTR Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xe56
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x449
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": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}
  • {"condition_id": 1618, "type": "SuppressIf", "offset": 499276, "expr": ["EqIdVal QuestionId: 0xE53, Value: 0x0"]}
  • {"condition_id": 1619, "type": "SuppressIf", "offset": 499324, "expr": ["EqIdVal QuestionId: 0xE54, Value: 0x1", "Not"]}

Record 3917

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
0xe57
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x465
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}
  • {"condition_id": 1618, "type": "SuppressIf", "offset": 499276, "expr": ["EqIdVal QuestionId: 0xE53, Value: 0x0"]}

Record 3918

Non Snoop Latency Value

Firmware Value

LTR Non Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xe58
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4e7
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}
  • {"condition_id": 1618, "type": "SuppressIf", "offset": 499276, "expr": ["EqIdVal QuestionId: 0xE53, Value: 0x0"]}
  • {"condition_id": 1620, "type": "SuppressIf", "offset": 499468, "expr": ["EqIdVal QuestionId: 0xE57, Value: 0x1", "Not"]}

Record 3919

Non Snoop Latency Multiplier

Firmware Value

LTR Non Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xe59
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x481
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": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}
  • {"condition_id": 1618, "type": "SuppressIf", "offset": 499276, "expr": ["EqIdVal QuestionId: 0xE53, Value: 0x0"]}
  • {"condition_id": 1620, "type": "SuppressIf", "offset": 499468, "expr": ["EqIdVal QuestionId: 0xE57, Value: 0x1", "Not"]}

Record 3920

LTR Lock

Firmware Value

PCIE LTR Configuration Lock

Opcode
OneOf
Question ID
0xe5a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x411
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}

Record 3921

Peer Memory Write Enable

Firmware Value

Peer Memory Write Enable/Disable

Opcode
OneOf
Question ID
0xe5b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0xd0
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1615, "type": "SuppressIf", "offset": 498401, "expr": ["EqIdVal QuestionId: 0xE3D, Value: 0x0"]}