Won't stay asleep, immediately wakes back up

[foobaz]

I just installed 10.04 and everything works great except sleep. The machine can sleep and hibernate but when I sleep (suspend to RAM aka S3), the machine falls asleep and wakes back up after about three seconds. Does anyone know what could cause this? Can you suggest anything I could try that might fix it?

I have an Intel DG41TY with a G41 chipset, a Core 2 Quad CPU, and a Radeon HD4350 video card. I haven't installed any proprietary drivers or anything weird, it's a stock install.

Thanks for any help you can provide.

[foobaz]

Re: Won't stay asleep, immediately wakes back up

I just noticed that if I unplug the ethernet cable, it will stay asleep. Could Kubuntu be set to wake on network access? Is there any way to turn that off?

[abalone]

Re: Won't stay asleep, immediately wakes back up

There might be an option for it in your BIOS setup?

[foobaz]

Re: Won't stay asleep, immediately wakes back up

Just in case anyone else is having the same problem, I thought I'd share my solution. My ethernet port was set to wake on any network access. You can set it to normal behavior with "sudo ethtool -s eth0 wol g". This will make it only wake up if if gets a wake-on-lan packet.

Unfortunately the ethernet port does not remember this setting between reboots, so I had to create a file in /etc/init.d that turns it on at boot. I had to use some command line tool to enable the new file as a startup script. Here's what the file looks like:

#!/bin/sh
### BEGIN INIT INFO
# Provides: wol
# Required-Start: $network
# Required-Stop: $network
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Fixes WOL
# Description: Fixes broken wake-on-lan
### END INIT INFO

/sbin/ethtool -s eth0 wol g
exit