ahmza
a0d9135695
Arming the built-in xHCI root hubs made them wake on hub-level events (USB-C PD negotiation, SD card reader, internal peripherals), causing the laptop to immediately self-wake from suspend. Drop the root-hub rule and arm only the keyboard leaf by VID:PID; a leaf device's remote-wakeup propagates through the hub without the hub's own wakeup flag being set.
20 lines
1.1 KiB
Nix
20 lines
1.1 KiB
Nix
{...}: {
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flake.nixosModules.t480UsbWakeup = {...}: {
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services.udev.extraRules = ''
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# Wake the T480 from S3 suspend via a keyboard plugged into a built-in USB
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# port. The dock connects over the Thunderbolt-3 controller (3c:00.0), which
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# powers down in S3 and cannot detect a cold replug — so dock-connected input
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# cannot wake the machine after an unplug-triggered suspend. The built-in xHCI
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# (00:14.0) stays wake-capable in S3, so a keyboard on a built-in port works.
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#
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# Arm ONLY the keyboard itself (match by VID:PID — the USB bus path is
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# unstable across re-enumeration). Deliberately do NOT arm the built-in root
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# hubs: arming a whole root hub makes it wake on hub-level events (USB-C PD
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# negotiation, the SD card reader, internal peripherals), causing spurious
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# self-wakes. A leaf device's remote-wakeup propagates through the hub without
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# the hub's own wakeup flag being set.
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ACTION=="add", SUBSYSTEM=="usb", ATTR{idVendor}=="320f", ATTR{idProduct}=="5055", ATTR{power/wakeup}="enabled"
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'';
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};
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}
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