ID_MM_DEVICE_MANUAL_SCAN_ONLY not applied properly?

Bjørn Mork bjorn at
Fri May 18 16:05:27 UTC 2018

Aleksander Morgado <aleksander at> writes:

>>> The ID_MM_DEVICE_MANUAL_SCAN_ONLY is applied on the usb_device matched
>>> by vid:pid from the list of rules we have.
>>> This first run is after booting the machine: I don't see the tag applied.
>> Maybe you forgot to update your initramfs after adding the new rule?
> Hum... why would that be needed? udev rules are applied on boot as
> soon as the USB devices gets exposed by the system. Or am I missing
> something?

This tends to happen before the real root system is mounted.  And there
is no later rediscovery of already discovered USB devices.  At least
that's how I thought this worked.  Could be wrong, as usual...

Looking at my initramfs I guess I must be.  I note that *some* udev
rules are copied there.  But most of them are not, and in particular the
default MM rules.  Weird.  Have to look further at this.


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