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

PCIe and Graphics

PCI Express Root Port 15

PCI Express Root Port 15 firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x13f2
Records
34
Path
Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 15

Record 3752

PCI Express Root Port 15

Firmware Value

Control the PCI Express Root Port.

Opcode
OneOf
Question ID
0xdc1
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x10d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Record 3753

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
0xdc2
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x375
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Built-in
1SlotStandard default

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}
  • {"condition_id": 1592, "type": "GrayOutIf", "offset": 493245, "expr": ["EqIdVal QuestionId: 0xDCF, Value: 0x1"]}

Record 3754

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
0x15ee
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x129
Width
1 byte(s)
Range
0 to 4 step 0
ValueLabelMarkers
0DisabledStandard default
2L1
4Auto

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3755

L1 Substates

Firmware Value

PCI Express L1 Substates settings.

Opcode
OneOf
Question ID
0x160a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2cd
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1L1.1
2L1.1 & L1.2

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3756

L1 Low

Firmware Value

PCI Express L1 Low Substate Enable/Disable.

Opcode
OneOf
Question ID
0xdc3
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2e9
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3757

ACS

Firmware Value

Enable/Disable Access Control Services Extended Capability

Opcode
OneOf
Question ID
0xdc4
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x305
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3758

PTM

Firmware Value

Enable/Disable Precision Time Measurement

Opcode
OneOf
Question ID
0x1626
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x321
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3759

DPC

Firmware Value

Enable/Disable Downstream Port Containment

Opcode
OneOf
Question ID
0xdc5
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x33d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3760

EDPC

Firmware Value

Enable/Disable Rootport extensions for Downstream Port Containment

Opcode
OneOf
Question ID
0xdc6
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x359
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3761

URR

Firmware Value

PCI Express Unsupported Request Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xdc7
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x145
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3762

FER

Firmware Value

PCI Express Device Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xdc8
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x161
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3763

NFER

Firmware Value

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

Opcode
OneOf
Question ID
0xdc9
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x17d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3764

CER

Firmware Value

PCI Express Device Correctable Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xdca
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x199
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3765

SEFE

Firmware Value

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

Opcode
OneOf
Question ID
0xdcb
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1ed
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3766

SENFE

Firmware Value

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

Opcode
OneOf
Question ID
0xdcc
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x209
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3767

SECE

Firmware Value

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

Opcode
OneOf
Question ID
0xdcd
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x225
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3768

PME SCI

Firmware Value

PCI Express PME SCI Enable/Disable.

Opcode
OneOf
Question ID
0xdce
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x241
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3769

Hot Plug

Firmware Value

PCI Express Hot Plug Enable/Disable.

Opcode
OneOf
Question ID
0xdcf
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x25d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}
  • {"condition_id": 1593, "type": "GrayOutIf", "offset": 493797, "expr": ["EqIdVal QuestionId: 0xDC2, Value: 0x0"]}

Record 3770

Advanced Error Reporting

Firmware Value

Advanced Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xdd0
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x279
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3771

PCIe Speed

Firmware Value

Configure PCIe Speed

Opcode
OneOf
Question ID
0xdd1
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x295
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0AutoStandard default
1Gen1
2Gen2
3Gen3

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3772

Transmitter Half Swing

Firmware Value

Transmitter Half Swing Enable/Disable.

Opcode
OneOf
Question ID
0xdd2
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2b1
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3773

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
0xdd3
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x39f
Width
2 byte(s)
Range
0 to 65535 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3774

Extra Bus Reserved

Firmware Value

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

Opcode
Numeric
Question ID
0xdd4
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x52d
Width
1 byte(s)
Range
0 to 7 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3775

Reserved Memory

Firmware Value

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

Opcode
Numeric
Question ID
0xdd5
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x557
Width
2 byte(s)
Range
1 to 20 step 1

Default store records

Store IDStore labelValueOption label
0Standard10

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3776

Reserved I/O

Firmware Value

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

Opcode
Numeric
Question ID
0xdd6
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x581
Width
1 byte(s)
Range
4 to 20 step 4

Default store records

Store IDStore labelValueOption label
0Standard4

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3777

LTR

Firmware Value

PCH PCIE Latency Reporting Enable/Disable

Opcode
OneOf
Question ID
0xdd7
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3f1
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3778

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
0xdd8
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x429
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}
  • {"condition_id": 1594, "type": "SuppressIf", "offset": 494112, "expr": ["EqIdVal QuestionId: 0xDD7, Value: 0x0"]}

Record 3779

Snoop Latency Value

Firmware Value

LTR Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xdd9
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4a7
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}
  • {"condition_id": 1594, "type": "SuppressIf", "offset": 494112, "expr": ["EqIdVal QuestionId: 0xDD7, Value: 0x0"]}
  • {"condition_id": 1595, "type": "SuppressIf", "offset": 494160, "expr": ["EqIdVal QuestionId: 0xDD8, Value: 0x1", "Not"]}

Record 3780

Snoop Latency Multiplier

Firmware Value

LTR Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xdda
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x445
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": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}
  • {"condition_id": 1594, "type": "SuppressIf", "offset": 494112, "expr": ["EqIdVal QuestionId: 0xDD7, Value: 0x0"]}
  • {"condition_id": 1595, "type": "SuppressIf", "offset": 494160, "expr": ["EqIdVal QuestionId: 0xDD8, Value: 0x1", "Not"]}

Record 3781

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
0xddb
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x461
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}
  • {"condition_id": 1594, "type": "SuppressIf", "offset": 494112, "expr": ["EqIdVal QuestionId: 0xDD7, Value: 0x0"]}

Record 3782

Non Snoop Latency Value

Firmware Value

LTR Non Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xddc
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4df
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}
  • {"condition_id": 1594, "type": "SuppressIf", "offset": 494112, "expr": ["EqIdVal QuestionId: 0xDD7, Value: 0x0"]}
  • {"condition_id": 1596, "type": "SuppressIf", "offset": 494304, "expr": ["EqIdVal QuestionId: 0xDDB, Value: 0x1", "Not"]}

Record 3783

Non Snoop Latency Multiplier

Firmware Value

LTR Non Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xddd
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x47d
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": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}
  • {"condition_id": 1594, "type": "SuppressIf", "offset": 494112, "expr": ["EqIdVal QuestionId: 0xDD7, Value: 0x0"]}
  • {"condition_id": 1596, "type": "SuppressIf", "offset": 494304, "expr": ["EqIdVal QuestionId: 0xDDB, Value: 0x1", "Not"]}

Record 3784

LTR Lock

Firmware Value

PCIE LTR Configuration Lock

Opcode
OneOf
Question ID
0xdde
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x40d
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}

Record 3785

Peer Memory Write Enable

Firmware Value

Peer Memory Write Enable/Disable

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

Visibility / conditions

  • {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]}