https://bugzilla.kernel.org/show_bug.cgi?id=221957
Bug ID: 221957
Summary: ASUS ROG Strix B450-F GAMING: malformed _PLD on all
USB ports, AE_AML_UNINITIALIZED_ELEMENT (UPGP missing
XDID 0x43D5 branch)
Product: ACPI
Version: 2.5
Hardware: AMD
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: Config-Tables
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 310774
--> https://bugzilla.kernel.org/attachment.cgi?id=310774&action=edit
Full writeup: root cause, ASL fix, and verification steps (ASUS B450-F
UPGP/_PLD)
Board: ASUS ROG Strix B450-F GAMING
BIOS: 5901 (2025-10-03), AMI Aptio
Kernel: 6.19.14 (also reproduces on other recent 6.x kernels, any distro)
Every boot produces ~59 errors of the form:
ACPI Error: Aborting method \_SB.PCI0.GPP2.PTXH.RHUB.POTx._PLD
due to previous error (AE_AML_UNINITIALIZED_ELEMENT)
(psparse-529)
one set per USB port on the chipset's xHCI controller (PCI 1022:43d5).
Root cause: the DSDT's UPGP() method fills a 22-element USBP Package
by branching on the xHCI controller's PCI device ID (XDID):
If ((XDID == 0x43B9) || (XDID == 0x43D0)) // PT4 map
ElseIf (XDID == 0x43BB) // PT2 map
ElseIf (XDID == 0x43BC) // PT1 map
// no Else branch
This board's xHCI reports XDID == 0x43D5, which matches none of the
above branches. USBP is never populated, and every port's _PLD method
dereferences an uninitialized Package element via GPLD(), aborting on
every single call.
Fix (confirmed working on this board, 0 errors after applying): add
one ElseIf branch to UPGP(), reusing the existing PT4 map (it matches
this board's actual physical port layout):
ElseIf ((XDID == 0x43D5))
{
While (Local0)
{
Local0--
USBP [Local0] = DerefOf (PT4 [Local0])
}
}
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