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

PCIe and Graphics

PCI Express Root Port 1

PCI Express Root Port 1 firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x157c
Records
34
Path
Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 1

Record 3276

PCI Express Root Port 1

Firmware Value

Control the PCI Express Root Port.

Opcode
OneOf
Question ID
0xc0f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0xff
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Record 3277

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
0xc10
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x367
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Built-in
1SlotStandard default

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}
  • {"condition_id": 1508, "type": "GrayOutIf", "offset": 475171, "expr": ["EqIdVal QuestionId: 0xC1D, Value: 0x1"]}

Record 3278

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
0x15e0
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x11b
Width
1 byte(s)
Range
0 to 4 step 0
ValueLabelMarkers
0DisabledStandard default
2L1
4Auto

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3279

L1 Substates

Firmware Value

PCI Express L1 Substates settings.

Opcode
OneOf
Question ID
0x15fc
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2bf
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1L1.1
2L1.1 & L1.2

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3280

L1 Low

Firmware Value

PCI Express L1 Low Substate Enable/Disable.

Opcode
OneOf
Question ID
0xc11
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2db
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3281

ACS

Firmware Value

Enable/Disable Access Control Services Extended Capability

Opcode
OneOf
Question ID
0xc12
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2f7
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3282

PTM

Firmware Value

Enable/Disable Precision Time Measurement

Opcode
OneOf
Question ID
0x1618
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x313
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3283

DPC

Firmware Value

Enable/Disable Downstream Port Containment

Opcode
OneOf
Question ID
0xc13
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x32f
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3284

EDPC

Firmware Value

Enable/Disable Rootport extensions for Downstream Port Containment

Opcode
OneOf
Question ID
0xc14
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x34b
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3285

URR

Firmware Value

PCI Express Unsupported Request Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xc15
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x137
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3286

FER

Firmware Value

PCI Express Device Fatal Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xc16
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x153
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3287

NFER

Firmware Value

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

Opcode
OneOf
Question ID
0xc17
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x16f
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3288

CER

Firmware Value

PCI Express Device Correctable Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xc18
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x18b
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3289

SEFE

Firmware Value

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

Opcode
OneOf
Question ID
0xc19
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1df
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3290

SENFE

Firmware Value

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

Opcode
OneOf
Question ID
0xc1a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x1fb
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3291

SECE

Firmware Value

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

Opcode
OneOf
Question ID
0xc1b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x217
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3292

PME SCI

Firmware Value

PCI Express PME SCI Enable/Disable.

Opcode
OneOf
Question ID
0xc1c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x233
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3293

Hot Plug

Firmware Value

PCI Express Hot Plug Enable/Disable.

Opcode
OneOf
Question ID
0xc1d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x24f
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}
  • {"condition_id": 1509, "type": "GrayOutIf", "offset": 475723, "expr": ["EqIdVal QuestionId: 0xC10, Value: 0x0"]}

Record 3294

Advanced Error Reporting

Firmware Value

Advanced Error Reporting Enable/Disable.

Opcode
OneOf
Question ID
0xc1e
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x26b
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3295

PCIe Speed

Firmware Value

Configure PCIe Speed

Opcode
OneOf
Question ID
0xc1f
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x287
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0AutoStandard default
1Gen1
2Gen2
3Gen3

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3296

Transmitter Half Swing

Firmware Value

Transmitter Half Swing Enable/Disable.

Opcode
OneOf
Question ID
0xc20
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x2a3
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3297

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
0xc21
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x383
Width
2 byte(s)
Range
0 to 65535 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3298

Extra Bus Reserved

Firmware Value

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

Opcode
Numeric
Question ID
0xc22
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x51f
Width
1 byte(s)
Range
0 to 7 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3299

Reserved Memory

Firmware Value

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

Opcode
Numeric
Question ID
0xc23
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x53b
Width
2 byte(s)
Range
1 to 20 step 1

Default store records

Store IDStore labelValueOption label
0Standard10

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3300

Reserved I/O

Firmware Value

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

Opcode
Numeric
Question ID
0xc24
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x573
Width
1 byte(s)
Range
4 to 20 step 4

Default store records

Store IDStore labelValueOption label
0Standard4

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3301

LTR

Firmware Value

PCH PCIE Latency Reporting Enable/Disable

Opcode
OneOf
Question ID
0xc25
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3e3
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0Disabled
1EnabledStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3302

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
0xc26
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x41b
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}
  • {"condition_id": 1510, "type": "SuppressIf", "offset": 476038, "expr": ["EqIdVal QuestionId: 0xC25, Value: 0x0"]}

Record 3303

Snoop Latency Value

Firmware Value

LTR Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xc27
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x48b
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}
  • {"condition_id": 1510, "type": "SuppressIf", "offset": 476038, "expr": ["EqIdVal QuestionId: 0xC25, Value: 0x0"]}
  • {"condition_id": 1511, "type": "SuppressIf", "offset": 476086, "expr": ["EqIdVal QuestionId: 0xC26, Value: 0x1", "Not"]}

Record 3304

Snoop Latency Multiplier

Firmware Value

LTR Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xc28
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x437
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": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}
  • {"condition_id": 1510, "type": "SuppressIf", "offset": 476038, "expr": ["EqIdVal QuestionId: 0xC25, Value: 0x0"]}
  • {"condition_id": 1511, "type": "SuppressIf", "offset": 476086, "expr": ["EqIdVal QuestionId: 0xC26, Value: 0x1", "Not"]}

Record 3305

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
0xc29
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x453
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Disabled
1Manual
2AutoStandard defaultManufacturing default

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}
  • {"condition_id": 1510, "type": "SuppressIf", "offset": 476038, "expr": ["EqIdVal QuestionId: 0xC25, Value: 0x0"]}

Record 3306

Non Snoop Latency Value

Firmware Value

LTR Non Snoop Latency value of PCH PCIE

Opcode
Numeric
Question ID
0xc2a
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x4c3
Width
2 byte(s)
Range
0 to 1023 step 1

Default store records

Store IDStore labelValueOption label
0Standard60

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}
  • {"condition_id": 1510, "type": "SuppressIf", "offset": 476038, "expr": ["EqIdVal QuestionId: 0xC25, Value: 0x0"]}
  • {"condition_id": 1512, "type": "SuppressIf", "offset": 476230, "expr": ["EqIdVal QuestionId: 0xC29, Value: 0x1", "Not"]}

Record 3307

Non Snoop Latency Multiplier

Firmware Value

LTR Non Snoop Latency Multiplier of PCH PCIE

Opcode
OneOf
Question ID
0xc2b
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x46f
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": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}
  • {"condition_id": 1510, "type": "SuppressIf", "offset": 476038, "expr": ["EqIdVal QuestionId: 0xC25, Value: 0x0"]}
  • {"condition_id": 1512, "type": "SuppressIf", "offset": 476230, "expr": ["EqIdVal QuestionId: 0xC29, Value: 0x1", "Not"]}

Record 3308

LTR Lock

Firmware Value

PCIE LTR Configuration Lock

Opcode
OneOf
Question ID
0xc2c
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0x3ff
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}

Record 3309

Peer Memory Write Enable

Firmware Value

Peer Memory Write Enable/Disable

Opcode
OneOf
Question ID
0xc2d
VarStore
PchSetup
VarStore GUID
4570B7F1-ADE8-4943-8DC3-406472842384
Offset
0xbe
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

Visibility / conditions

  • {"condition_id": 1507, "type": "SuppressIf", "offset": 475163, "expr": ["EqIdVal QuestionId: 0xC0F, Value: 0x0"]}