You can try to set HandleLidSwitch=ignore event defined in /etc/systems/logind.conf. That will definitely prevent the laptop from sleeping on lid close. It might also prevent the laptop from waking on lid open.
Regardless, I suggest hunting down what broke that setup recently. Its probably some new daemon is responsible for configuring those events in a less arcane way.
You could just drop the line into a script (without the sudo) into /usr/local/bin/ and call it on startup.
If you use systemd it's as simple as:
[Unit]
Description=Disable Lid Suspend
[Service]
Type=oneshot
ExecStart=/usr/local/bin/lid-suspend
[Install]
WantedBy=basic.target
Just drop it into /etc/systemd/system/lid-suspend.service and then call sudo systemctl daemon-reload and sudo systemctl enable lid-suspend
I would assume your system is using systemd (I don't use Kubuntu specifically); the laptop lid is (now in 2026) controlled by the systemd infrastructure - it's a matter of setting a config option and this should fix you up. Arch as usual has the best wiki on the subject:
https://wiki.archlinux.org/title/Power_management#ACPI_events
You're probably looking at HandleLidSwitch* options. There's still nothing wrong with the manual disable to /proc/acpi/wakeup to cover your bases (layers of the onion), I'm fighting with a "modern" laptop that only has s2idle and it's terrible compared to S3 - I'm in ACPI wakeup hell and still trying to figure out what's causing it.
This reminds me of the new trend of kids breaking hinges and propping laptops open with fruit or whatever so they can keep AI running without "sleep" or "wake"
The solution?
Dunno. Just wanted to share my thoughts
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