[systemd-bugs] [Bug 89787] New: udev rule doesn't load automatcially (but manually) for a specific device under certain situtations

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89787

            Bug ID: 89787
           Summary: udev rule doesn't load automatcially (but manually)
                    for a specific device under certain situtations
           Product: systemd
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: general
          Assignee: systemd-bugs at lists.freedesktop.org
          Reporter: tom.ty89 at gmail.com
        QA Contact: systemd-bugs at lists.freedesktop.org

I have two Logitech usb receivers for mouse and keyboard (non-Bluetooth), one
is a "Unifying" receiver and the other is an older traditional one. (Same
idVendor attribute)

The traditional one has a default value of "enabled" for power wakeup (and the
Unifying one has "disabled").

When I try set it to disabled with a udev rule, I found that the rule get
loaded automatically only if it is the only receiver plugged in, or when it's
plugged into a port with a smaller port number than the Unifying one (port
number as shown in lsusb -t, which are presistent among boots).

Otherwise I have to unplug and plug again, or run `udevadm test` to make it
load (which indicates that the rules written are fine I assume).

In another case when none of the receivers were plugged in before boot, I still
need to plug in the receiver twice to get the rules loaded.

It doesn't seem to matter whether I match the device with the idVendor
attribute. Even when I test with rule like `SUBSYSTEM=="USB" and
ATTR="enabled"/"disabled"`, the receiver seems to be an exception (though I
only got the two, others are just the "usb bus").

Yet the Unifying one doesn't have this problem, no matter which port it's
plugged into, the value can be set to enabled without a hassle.

I also have two flash drives plugged into Port 1 and 2 among the tests, which
doesn't seem to affect.

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