WTLI2CArrowLake

Renamed from LegionI2CArrowLake on 2026-10-31; the kext is still LegionI2CArrowLake.kext. Old links redirect here.

A codeless kext (one Info.plist, no binary) that lets VoodooI2C drive the I2C controllers of Intel's Arrow Lake-HX / 800-series PCH (8086:7F4C to 7F4F, 7F7A and 7F7B), so an I2C touchpad on those laptops works in macOS. VoodooI2C 2.9.1 only matches Sunrise Point, Cannon Lake, Comet Lake and Ice Lake controller IDs; this adds a personality for the Arrow Lake ones with the right timing values and the controller class that wakes the device from D3hot.

Written for a Lenovo Legion 5 15IAX10, whose ELAN06FA touchpad (PNP0C50, ACPI \_SB.PC02.I2C1.TPD0) sits on I2C1 = 8086:7F4D.

• It needs -vi2c-force-polling: VoodooGPIO has no community data for the Arrow Lake GPIO controllers (INTC1082 / INTC1084), so the touchpad interrupt cannot be routed and VoodooI2C polls instead. That costs a little CPU and latency; it does not affect how the pad feels here.
• It only matches the controller. Your touchpad still needs the right VoodooI2C satellite (VoodooI2CHID for PNP0C50 HID-over-I2C devices) and an ACPI _STA that says the device is present under Darwin.
• Tested on two laptops: the Legion 5 15IAX10 (7F4D) and one user's Arrow Lake laptop (7F7A). The other matched IDs (7F4C, 7F4E, 7F4F, 7F7B) have not been tested with this kext.

1. Install VoodooI2C 2.9.1 (with its VoodooGPIO and VoodooI2CServices plugins) and VoodooI2CHID the usual way. If VoodooPS2 is also loaded, load only one copy of VoodooInput. Use the 2.9.1 release, not a master or nightly build. Master dropped VoodooI2CPCILakeController on 2025-11-25 (VoodooI2C 054d5d1, PR #575) and moved the D0 write into the plain VoodooI2CPCIController, so on a master build the IOClass below finds no class and the kext never binds. The owner of an ASUS FX608LP reports that naming VoodooI2CPCIController there works; we have only tested the 2.9.1 release.

2. Copy LegionI2CArrowLake.kext to EFI/OC/Kexts/ and add it to config.plist, Kernel > Add, after VoodooI2C and VoodooI2CHID:

   BundlePath      LegionI2CArrowLake.kext
   ExecutablePath  (empty)
   PlistPath       Contents/Info.plist
   MinKernel       (empty)
   MaxKernel       (empty)
   Enabled         true
   

3. Add -vi2c-force-polling to boot-args.

4. Reboot and check:

   ioreg -r -c VoodooI2CPCILakeController -l -w0 | grep -E 'IOPCIMatch|I2CClkRate|COMP'
   ioreg -r -c VoodooI2CHIDDevice | head
   

5. Rollback: set Enabled to false. It has no code, so the worst case is a touchpad that stays dead.

VoodooI2C's controller personalities carry the clock and timing values per PCH generation and name a controller class. Linux gives the Arrow Lake-HX LPSS I2C functions the same bxt_i2c_info timing table as Ice Lake (0x34E8), so the Ice Lake values are copied. The first version used the plain VoodooI2CPCIController class and failed: the firmware leaves the controller in D3hot, every register read returned 0xffffffff (COMP_TYPE included), and VoodooI2C gave up. The VoodooI2CPCILakeController class writes the PMCSR (capability 0x80) to bring the function to D0 first, which is what 1.1.0 changed. More in docs/HOW-IT-WORKS.md.

• VoodooI2C (alexandred and contributors, GPL-2.0): the driver this plugs into.
• Linux drivers/mfd/intel-lpss-pci.c: the device IDs and timing table.
• CENSEDAXIS20025/ASUS-FX608LP-Hackintosh-Multiboot: an ASUS FX608LP with the same Core Ultra 9 275HX and an ELAN touchpad on 8086:7F4E. Its notes were the first to show that this personality does not bind on a VoodooI2C master build, and describe patches for pads whose interrupt looks like a valid APIC pin (at or below 0x2f), where VoodooI2C returns before it reads -vi2c-force-polling; no code from it is in this repository.
• bafcz/Hackintosh_LegionY9000P-IRX8_RaptorLake-HX (GPL-3.0, bafcz): an interrupt-driven ELAN06FA touchpad on a Raptor Lake-HX Legion through a modified VoodooI2C and a VoodooGPIO pin table, the route we would follow to get Arrow Lake off polling (#1); no code from it is in this repository.

The Info.plist is ISC (see LICENSE). VoodooI2C itself is GPL-2.0 and is not included here.