Fix Fedora Battery Drain During Sleep

Your Fedora laptop's battery drains overnight because USB controllers and system timers keep waking it from suspend. Here's the permanent fix.

The Problem

Your laptop enters suspend mode but immediately wakes up, creating a suspend-wake loop that drains the battery. The culprits are typically:

• USB controllers (XHC, TXHC)
• Thunderbolt controllers (TDM0, TDM1, TRP0, TRP2)
• System timer (AWAC)

Check your current wake sources:

cat /proc/acpi/wakeup

The Solution

Create a systemd service that disables problematic wake sources at boot. This won't affect lid-open or power-button wake functionality.

Step 1: Create Disable Script

sudo nano /usr/local/sbin/disable-wake.sh

Add this content:

#!/bin/bash

# Disable problematic ACPI wake sources
echo XHC > /proc/acpi/wakeup
echo RP09 > /proc/acpi/wakeup
echo TXHC > /proc/acpi/wakeup
echo TDM0 > /proc/acpi/wakeup
echo TDM1 > /proc/acpi/wakeup
echo TRP0 > /proc/acpi/wakeup
echo TRP2 > /proc/acpi/wakeup
echo AWAC > /proc/acpi/wakeup

Make it executable:

sudo chmod +x /usr/local/sbin/disable-wake.sh

Step 2: Create Systemd Service

sudo nano /etc/systemd/system/disable-wake.service

Add this configuration:

[Unit]
Description=Disable unwanted ACPI wake-up sources at boot

[Service]
Type=oneshot
ExecStart=/usr/local/sbin/disable-wake.sh

[Install]
WantedBy=multi-user.target

Step 3: Enable and Activate

sudo systemctl enable disable-wake.service
sudo reboot

How It Works

Writing a device name to /proc/acpi/wakeup toggles its wake capability. The systemd service runs at boot to ensure these devices stay disabled across restarts.

Note: LID0 (lid sensor) and PBTN (power button) remain enabled, so you can still wake your laptop normally.

Verification

After reboot, check that problematic devices show *disabled:

cat /proc/acpi/wakeup

Your battery should now last through the night.