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Bug #667
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mb/lenovo/sklkbl_thinkpad: Enabling SMBus breaks trackpoint with LEN0094 touchpad
Bug #667:
mb/lenovo/sklkbl_thinkpad: Enabling SMBus breaks trackpoint with LEN0094 touchpad
Start date:
10/16/2026
Due date:
% Done:
0%
Estimated time:
Affected versions:
Needs backport to:
Affected hardware:
Lenovo Thinkpad T480
Affected OS:
Linux (tested 6.1.170 and 6.12.111)
Description
Change 95640, which enables the SMBus controller, breaks the trackpoint on my T480. The trackpoint and its buttons no longer react to input; the touchpad's PS/2 pass-through port is detected but the trackpoint itself isn't.
The breakage seems to be in the EC: after flashing a build of coreboot with SMBus disabled, the trackpoint continues to be invisible until the EC is reset using the reset hole or by removing the batteries.
My machine has a different touchpad (LEN0094) than the one that the change was tested with (TM3418-002).
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