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Date:   Sat, 9 Jan 2021 00:25:28 +0800
From:   Kai-Heng Feng <>
To:     "Rafael J. Wysocki" <>
Cc:     Greg Kroah-Hartman <>,,
        ACPI Devel Maling List <>,
        LKML <>
Subject: Multiple MODALIAS= in uevent file confuses userspace

Commit 8765c5ba19490 ("ACPI / scan: Rework modalias creation when
"compatible" is present") creates two modaliases for certain ACPI
devices. However userspace (systemd-udevd in this case) assumes uevent
file doesn't have duplicated keys, so two "MODALIAS=" breaks the

Based on the assumption, systemd-udevd internally uses hashmap to
store each line of uevent file, so the second modalias always replaces
the first modalias.

My attempt [1] is to add a new key, "MODALIAS1" for the second
modalias. This brings up the question of whether each key in uevent
file is unique. If it's no unique, this may break may userspace.



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