Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / PCI Express Root Port 18
PCIe and Graphics
PCI Express Root Port 18
PCI Express Root Port 18 firmware setup page decoded from AMI HII/IFR resources.
Form ID 0x13f5
Records 34
Path Setup / Chipset / PCH-IO Configuration / PCI Express Configuration / PCI Express Root Port 18
Record 3854
PCI Express Root Port 18 Firmware Value
Control the PCI Express Root Port.
Opcode OneOf
Question ID 0xe1e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x110
Width 1 byte(s)
Range 0 to 1 step 0 Permalink
Record 3855
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 0xe1f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x378
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} {"condition_id": 1610, "type": "GrayOutIf", "offset": 497118, "expr": ["EqIdVal QuestionId: 0xE2C, Value: 0x1"]} Permalink
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 0x15f1
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x12c
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
PCI Express L1 Substates settings.
Opcode OneOf
Question ID 0x160d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2d0
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
PCI Express L1 Low Substate Enable/Disable.
Opcode OneOf
Question ID 0xe20
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2ec
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Enable/Disable Access Control Services Extended Capability
Opcode OneOf
Question ID 0xe21
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x308
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Enable/Disable Precision Time Measurement
Opcode OneOf
Question ID 0x1629
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x324
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Enable/Disable Downstream Port Containment
Opcode OneOf
Question ID 0xe22
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x340
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Enable/Disable Rootport extensions for Downstream Port Containment
Opcode OneOf
Question ID 0xe23
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x35c
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
PCI Express Unsupported Request Reporting Enable/Disable.
Opcode OneOf
Question ID 0xe24
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x148
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
PCI Express Device Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xe25
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x164
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
PCI Express Device Non-Fatal Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xe26
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x180
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
PCI Express Device Correctable Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xe27
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x19c
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Root PCI Express System Error on Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xe28
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x1f0
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Root PCI Express System Error on Non-Fatal Error Enable/Disable.
Opcode OneOf
Question ID 0xe29
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x20c
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Root PCI Express System Error on Correctable Error Enable/Disable.
Opcode OneOf
Question ID 0xe2a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x228
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
PCI Express PME SCI Enable/Disable.
Opcode OneOf
Question ID 0xe2b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x244
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
PCI Express Hot Plug Enable/Disable.
Opcode OneOf
Question ID 0xe2c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x260
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} {"condition_id": 1611, "type": "GrayOutIf", "offset": 497670, "expr": ["EqIdVal QuestionId: 0xE1F, Value: 0x0"]} Permalink
Record 3872
Advanced Error Reporting Firmware Value
Advanced Error Reporting Enable/Disable.
Opcode OneOf
Question ID 0xe2d
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x27c
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Configure PCIe Speed
Opcode OneOf
Question ID 0xe2e
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x298
Width 1 byte(s)
Range 0 to 3 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Record 3874
Transmitter Half Swing Firmware Value
Transmitter Half Swing Enable/Disable.
Opcode OneOf
Question ID 0xe2f
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x2b4
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Record 3875
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 0xe30
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3a5
Width 2 byte(s)
Range 0 to 65535 step 1 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Record 3876
Extra Bus Reserved Firmware Value
Extra Bus Reserved (0-7) for bridges behind this Root Bridge.
Opcode Numeric
Question ID 0xe31
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x530
Width 1 byte(s)
Range 0 to 7 step 1 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Record 3877
Reserved Memory Firmware Value
Reserved Memory for this Root Bridge (1-20) MB
Opcode Numeric
Question ID 0xe32
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x55d
Width 2 byte(s)
Range 1 to 20 step 1 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Reserved I/O (4K/8K/12K/16K/20K) Range for this Root Bridge.
Opcode Numeric
Question ID 0xe33
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x584
Width 1 byte(s)
Range 4 to 20 step 4 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
PCH PCIE Latency Reporting Enable/Disable
Opcode OneOf
Question ID 0xe34
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x3f4
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Record 3880
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 0xe35
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x42c
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} {"condition_id": 1612, "type": "SuppressIf", "offset": 497985, "expr": ["EqIdVal QuestionId: 0xE34, Value: 0x0"]} Permalink
Record 3881
Snoop Latency Value Firmware Value
LTR Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xe36
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4ad
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} {"condition_id": 1612, "type": "SuppressIf", "offset": 497985, "expr": ["EqIdVal QuestionId: 0xE34, Value: 0x0"]} {"condition_id": 1613, "type": "SuppressIf", "offset": 498033, "expr": ["EqIdVal QuestionId: 0xE35, Value: 0x1", "Not"]} Permalink
Record 3882
Snoop Latency Multiplier Firmware Value
LTR Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xe37
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x448
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} {"condition_id": 1612, "type": "SuppressIf", "offset": 497985, "expr": ["EqIdVal QuestionId: 0xE34, Value: 0x0"]} {"condition_id": 1613, "type": "SuppressIf", "offset": 498033, "expr": ["EqIdVal QuestionId: 0xE35, Value: 0x1", "Not"]} Permalink
Record 3883
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 0xe38
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x464
Width 1 byte(s)
Range 0 to 2 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} {"condition_id": 1612, "type": "SuppressIf", "offset": 497985, "expr": ["EqIdVal QuestionId: 0xE34, Value: 0x0"]} Permalink
Record 3884
Non Snoop Latency Value Firmware Value
LTR Non Snoop Latency value of PCH PCIE
Opcode Numeric
Question ID 0xe39
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x4e5
Width 2 byte(s)
Range 0 to 1023 step 1 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} {"condition_id": 1612, "type": "SuppressIf", "offset": 497985, "expr": ["EqIdVal QuestionId: 0xE34, Value: 0x0"]} {"condition_id": 1614, "type": "SuppressIf", "offset": 498177, "expr": ["EqIdVal QuestionId: 0xE38, Value: 0x1", "Not"]} Permalink
Record 3885
Non Snoop Latency Multiplier Firmware Value
LTR Non Snoop Latency Multiplier of PCH PCIE
Opcode OneOf
Question ID 0xe3a
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x480
Width 1 byte(s)
Range 0 to 5 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} {"condition_id": 1612, "type": "SuppressIf", "offset": 497985, "expr": ["EqIdVal QuestionId: 0xE34, Value: 0x0"]} {"condition_id": 1614, "type": "SuppressIf", "offset": 498177, "expr": ["EqIdVal QuestionId: 0xE38, Value: 0x1", "Not"]} Permalink
PCIE LTR Configuration Lock
Opcode OneOf
Question ID 0xe3b
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x410
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink
Record 3887
Peer Memory Write Enable Firmware Value
Peer Memory Write Enable/Disable
Opcode OneOf
Question ID 0xe3c
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0xcf
Width 1 byte(s)
Range 0 to 1 step 0 Visibility / conditions {"condition_id": 1609, "type": "SuppressIf", "offset": 497110, "expr": ["EqIdVal QuestionId: 0xE1E, Value: 0x0"]} Permalink