https://bugs.kde.org/show_bug.cgi?id=506052
Bug ID: 506052
Summary: powerdevil cannot start because of CAP_WAKE_ALARM
Classification: Plasma
Product: plasmashell
Version First 6.4.0
Reported In:
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Power management & brightness
Assignee: plasma-b...@kde.org
Reporter: yam...@yamagi.org
Target Milestone: 1.0
Since Plasma 6.4.0 the powerdevil systemd unit sets
'AmbientCapabilities=CAP_WAKE_ALARM'. powerdevil is spawned as a user service
and can only gain capabilities which the 'systemd --user' service for the
session has:
% ps auxww | grep "systemd --user"
yamagi 1180 0.0 0.0 21804 11744 ? Ss 07:26 0:01
/usr/lib/systemd/systemd --user
% cat /proc/1180/status | grep CapAmb
CapAmb: 0000000000000000
-> The 'systemd --user' has no ambient capabilities, therefor it cannot set
'CAP_WAKE_ALARM' and starting powerdevil fails:
% journalctl --user -xu plasma-powerdevil.service
Jun 23 08:52:04 blubb (werdevil)[17116]: plasma-powerdevil.service: Failed to
apply ambient capabilities (before UID change): Operation not permitted
Jun 23 08:52:04 blubb (werdevil)[17116]: plasma-powerdevil.service: Failed at
step CAPABILITIES spawning /usr/lib/org_kde_powerdevil: Operation not permitted
This can be worked around by commenting the
'AmbientCapabilities=CAP_WAKE_ALARM'. Functionality requiring the
CAP_WAKE_ALARM won't work, though.
Linux/KDE Plasma: Arch Linux as of 23.06.2025 ca. 05:00 UTC with Linux
6.15.3-arch1-1 and systemd 257.6-1
KDE Plasma Version: 6.4.0
KDE Frameworks Version: 6.15.0
Qt Version: 6.9.1
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