Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026
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Overview / Manual / PCI Express Root Port 15
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 Permalink
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 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"]} 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 0x15ee
VarStore PchSetup
VarStore GUID 4570B7F1-ADE8-4943-8DC3-406472842384
Offset 0x129
Width 1 byte(s)
Range 0 to 4 step 0 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 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"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 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"]} Permalink
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 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"]} Permalink
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 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"]} Permalink
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 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"]} Permalink
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 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"]} Permalink
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 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"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink
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 Visibility / conditions {"condition_id": 1591, "type": "SuppressIf", "offset": 493237, "expr": ["EqIdVal QuestionId: 0xDC1, Value: 0x0"]} Permalink