Comment 2 for bug 1309938

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Amos Blanton (lightnin9) wrote : Re: Thinkpad Twist 3347-2HU resumes immediately after suspend

Found a workaround on a similar bug that is now closed:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1213233

It seems to work:

Add the following to: /etc/rc.local

if grep -q "EHC1.*enabled" /proc/acpi/wakeup; then
 echo EHC1 > /proc/acpi/wakeup
fi

(From: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1213233/comments/8 )