anyway, found the issue: the (R) sign. replace that with a * in the hwdb entry and it should work (at least it does here): mouse:usb:v045ep071d:name:Microsoft Microsoft* 2.4GHz Transceiver V1.0: MOUSE_DPI=1000@142 might want to file a new systemd bug for that, we should be able to handle 'funky' signs like this... from https://bugs.freedesktop.org/show_bug.cgi?id=90322
closing, systemd doesn't use this bugzilla anymore, please file in github if it's still an issue.
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