[BUG] usbhid: logitech bolt (046d:c548) spuriously wakes system from suspend

[Tomas Leypold]

Hi, I've got an logitech mx keys s keyboard with a logi bolt receiver
(046d:c548)
that wakes my pc from suspend on its own, no input involved, just a
moment after it goes to sleep. Reproducible on two different machines,
both nixos. One's a laptop with s2idle, the other's a pc with s3/deep.

Aug 09 00:08:07 w01 kernel: PM: suspend entry (deep)
Aug 09 00:08:12 w01 kernel: ACPI: PM: Preparing to enter system sleep
state S3
Aug 09 00:08:12 w01 kernel: ACPI: PM: Waking up from system sleep state S3
Aug 09 00:08:12 w01 kernel: PM: suspend exit

Sometimes replugging the receiver into a different USB port fixes it
temporarily, for a while.

HID_QUIRK_ALWAYS_POLL
(https://lore.kernel.org/linux-input/20260407-logi-bolt-hid-quirk-always-poll-v1-1-4dae0fda344e@xxxxxxxxxxxxx/)
doesn't seem relevant to this issue. 6.18.41 doesn't have that quirk,
7.1.6 does, and the bug happens on both.

In forums, people with the same problem recommend a udev rule setting
power/wakeup to disabled. That disables keyboard wake entirely.

After some debugging I found a more targeted workaround with no
downsides that I know of: unbinding usbhid from interface 0 (the
keyboard interface) right before suspend, rebinding after resume.
Remote wakeup stays armed, so a keypress still wakes the machine
normally.

Tried unbinding each of the four interfaces on its own, only interface
0 makes a difference.

Here's the systemd-sleep script, drop it in
/usr/lib/systemd/system-sleep/50-bolt-unbind, or wherever your distro
puts these, and chmod +x:

#!/bin/sh
find_dev() {
   for d in /sys/bus/usb/devices/*/idProduct; do
     [ -r "$d" ] || continue
     v=$(cat "$(dirname "$d")/idVendor" 2>/dev/null)
     p=$(cat "$d" 2>/dev/null)
     [ "$v" = "046d" ] && [ "$p" = "c548" ] && basename "$(dirname
"$d")" && return
   done
}
case "$1" in
   pre)
     dev=$(find_dev)
     [ -n "$dev" ] || exit 0
     echo "$dev:1.0" > /sys/bus/usb/drivers/usbhid/unbind
     ;;
   post)
     dev=$(find_dev)
     [ -n "$dev" ] || exit 0
     echo "$dev:1.0" > /sys/bus/usb/drivers/usbhid/bind
     ;;
esac

No idea what the right fix looks like on the kernel side, just wanted
to share what I found.

Happy to run further tests and try out patches.

Best regards,
Tomas Leypold