[manaskarekar]

Thanks.

I’ve had issues with T14s for a couple of gens where the machine wakes up during the closed lid and runs the battery down. I’ve tried the usual troubleshooting.

This has been a non issue on Dell machines for almost 20 years.

[colordrops]

Oh some kernel params and other settings can help with that. These are mine, and it's been working great:

Kernel params

    ## Seems to be needed for suspend to S0 (s2idle) without hanging (only needed on p16s)
    acpi_osi="Windows 2022"

    # Prevent spurious wakeups from a firmware bug where the EC or SMU generates spurious "heartbeat" interrupts during sleep
    acpi.ec_no_wakeup=1

    # Prevents dock from waking up laptop right after suspend
    usbcore.autosuspend=-1

Other settings (executed with a systemd service) (also only needed on p16s, not on my p14s)

    # Disable Thunderbolt PCIe root port wakeup (RP09)
    echo disabled > /sys/devices/pci0000:00/0000:00:1d.0/power/wakeup || true

    # Disable USB XHCI controller wakeup
    echo disabled > /sys/devices/pci0000:00/0000:00:14.0/power/wakeup || true

    # Disable ACPI wakeup for XHCI and RP09 (toggle if enabled)
    grep -q "XHCI.*enabled" /proc/acpi/wakeup && echo XHCI > /proc/acpi/wakeup || true
    grep -q "RP09.*enabled" /proc/acpi/wakeup && echo RP09 > /proc/acpi/wakeup || true

[cromka]

That's possibly because they had S3 disabled and used 'modern standby': https://learn.microsoft.com/en-us/windows-hardware/design/de...

[Grazester]

Somewhat related yet not. I had a Dell laptop near kill itself waking up while in my backpack and near melting itself. I think I blame Windows update for this though. This resulted in the laptop not being able to power on most of the times after that.