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To keep one download or other command-line job running while you step away, use systemd-inhibit to block sleep for as long as that command runs. For a broader change, adjust your desktop’s automatic-suspend settings. These methods have different scopes, and neither should be assumed to prevent a laptop from suspending when its lid closes.
Choose the method that matches the job
| Method | Scope | Best suited to |
|---|---|---|
systemd-inhibit |
One wrapped command; the inhibitor ends when the command exits. | A specific download, build, copy, or other task. |
| Ubuntu GNOME Automatic Suspend | Automatic suspension after inactivity, with separate options for battery and plugged-in power. | Keeping the computer awake more generally while idle. |
| KDE Plasma Power Management | Desktop suspend behavior, with AC, battery, and low-battery settings where supported. | Changing Plasma’s general power policy. |
Keep the computer awake for one command
On a system with systemd and systemd-inhibit installed, place the command and its arguments after the inhibitor options:
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systemd-inhibit --what=sleep:idle --why="Download in progress" curl -L -o archive.zip https://example.invalid/archive.zipReplace the example URL and command with the actual task. The URL above is intentionally nonfunctional. The wrapper holds the requested inhibitor while the command runs and releases it when the command exits, whether it finishes normally or stops.
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--what=sleep:idle explicitly requests protection against sleep and automatic idle handling. The manual lists the default inhibitor set as idle:sleep:shutdown; specifying the types makes the intended scope clear. Use systemd-inhibit --list to see active inhibitor locks. See the systemd-inhibit manual.
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Change automatic suspend settings in Ubuntu GNOME
Use this option when you want to change the general inactivity policy rather than tie awake time to one command:
- Open Activities and search for Power.
- Open the Power panel, then choose Automatic Suspend.
- Configure the options for On Battery Power and Plugged In, and choose the delay you want.
Ubuntu exposes separate settings for battery and plugged-in use, so check the power source that applies while the job runs. This changes automatic suspension behavior generally; it is not limited to a particular download or process. See Ubuntu’s Automatic Suspend help.
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Set suspend behavior in KDE Plasma
In KDE Plasma, open Power Management (PowerDevil) settings and choose the desired suspend-session behavior. On battery-powered systems, Plasma can provide separate controls for AC, battery, and low-battery states when supported. Menu names and available controls can vary by distribution and Plasma version. Consult the KDE Power Management documentation.
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What happens to work during suspend?
GNOME Help puts it simply: “When you suspend the computer, you send it to sleep.” Applications and documents normally remain open for when the computer resumes, but GNOME recommends saving work because something can go wrong and unsaved work may not be recoverable. See GNOME Help on suspending the computer.
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If the laptop lid is closed
Do not assume that a sleep inhibitor keeps a closed laptop awake. In systemd’s documented logind configuration, LidSwitchIgnoreInhibited= defaults to yes, while the corresponding settings for power, suspend, and hibernate keys default to no. Lid closure is therefore a separate case: a laptop may suspend when closed even while a process holds a sleep inhibitor, depending on its configuration. Check your distribution’s lid behavior if the job must run with the lid shut. See the systemd logind configuration documentation.
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Practical checks before leaving a task running
- For a single task, wrap that command with
systemd-inhibit; use desktop settings only if you want a broader inactivity-policy change. - Confirm whether the machine will be on battery or AC power and select the matching desktop setting where applicable.
- Allow for battery use throughout the run if preventing suspend while unplugged. The amount depends on the device and task; the cited documentation does not provide a general estimate.
- Save important work before leaving the computer unattended.
- Avoid
systemctl --ignore-inhibitorsas a prevention method: that option tells systemd to disregard inhibitor locks when a sleep or shutdown action is requested, which is the opposite of the goal.
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