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Note second Ubuntu hibernate blocker (pkla), PowerDevil cache gotcha, SleepMode=3

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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ergosteur
2026-09-28 23:22:17 -04:00
co-authored by Claude Opus 5.5
parent 3bc9f667e1
commit 052eeba304
1 changed files with 16 additions and 1 deletions
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@@ -162,8 +162,23 @@ Pieces:
checks passed (seen with checks passed (seen with
`systemctl service-log-level systemd-logind debug`). This rule sorts `systemctl service-log-level systemd-logind debug`). This rule sorts
earlier and returns `YES` for local, active users. earlier and returns `YES` for local, active users.
Ubuntu actually has *two* blockers: that JS rule and
`/var/lib/polkit-1/localauthority/10-vendor.d/com.ubuntu.desktop.pkla`
("Disable hibernate by default in logind/upower"), which is still read
because `polkitd-pkla` is installed. The `10-` rule overrides both:
`busctl call org.freedesktop.login1 /org/freedesktop/login1
org.freedesktop.login1.Manager CanSuspendThenHibernate` returns `yes`
as `matt`.
- **Plasma**: PowerDevil owns the lid, so each Power Management profile's - **Plasma**: PowerDevil owns the lid, so each Power Management profile's
sleep mode must be set to "Standby, then hibernate" in System Settings. sleep mode is set to "Standby, then hibernate". That's `SleepMode=3`
under `[AC|Battery|LowBattery][SuspendAndShutdown]` in
`~/.config/powerdevilrc` (set 2026-09-28 for all three profiles).
**Gotcha:** PowerDevil caches hibernate support when it starts, so
after the polkit fix the option didn't appear in System Settings until
`systemctl --user restart plasma-powerdevil.service` and System
Settings was reopened. Check PowerDevil's view with
`qdbus6 org.freedesktop.PowerManagement /org/freedesktop/PowerManagement
org.freedesktop.PowerManagement.CanSuspendThenHibernate`.
Tested 2026-09-28 with `systemctl hibernate`: a 3.8GB image, powered off, Tested 2026-09-28 with `systemctl hibernate`: a 3.8GB image, powered off,
and the session resumed intact (uptime carried over, root `rw`). Right and the session resumed intact (uptime carried over, root `rw`). Right