https://bugzilla.kernel.org/show_bug.cgi?id=222228
Bug ID: 222228
Summary: HONOR MagicBook Pro 14 (2025): Intel LPSS I2C
controllers fail with PCI_IRQ_NOTCONNECTED
Product: ACPI
Version: 2.5
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: Config-Interrupts
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Created attachment 311363
--> https://bugzilla.kernel.org/attachment.cgi?id=311363&action=edit
Diagnostic logs, PCI information, and ACPI tables (DSDT/APIC)
Hardware: HONOR MagicBook Pro 14 (2025), Intel Core Ultra 9 285H, BIOS 1.16.
Distribution: Arch Linux / Omarchy.
Problem: The built-in touchpad and touchscreen are not detected under Linux.
The touchscreen works in Windows.
All three Intel I2C PCI controllers (8086:7778, 8086:7779, 8086:777a) fail to
initialize.
Kernel logs show:
intel-lpss 0000:00:15.0: can't derive routing for PCI INT A
intel-lpss 0000:00:15.0: PCI INT A: not connected
intel-lpss 0000:00:15.0: probe with driver intel-lpss failed with error
-2147483648
Equivalent failures occur on 00:15.1 and 00:15.2.
The kernel also reports Unable to locate IOAPIC for GSI 255 and multiple
AE_AML_PACKAGE_LIMIT errors during ACPI device initialization.
The PCI root bridge PC02 maps to bus 0000:00. The firmware contains
interrupt-routing entries, but Linux does not assign usable interrupts to the
I2C controllers.
Expected: Intel LPSS I2C controllers initialize, allowing the touchpad and
touchscreen to be detected.
Actual: All three controllers fail to bind to their driver.
Kernel logs, PCI information, DSDT, and APIC tables are attached.
Possibly related to bug #221000
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