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For a few days, my Ubuntu 12.04 desktop computer has mysteriously been waking up immediately after going to suspend mode.

Since installation, my Ubuntu 12.10 laptop computer has also been resuming immediately after suspend and hibernation.

How to prevent those?

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2 Answers 2

up vote 7 down vote accepted

This problem was probably caused by strange USB signals. gedit /proc/acpi/wakeup showed me, that wakeup was enabled for USB0 and USB2.

sudo -s
echo USB0 > /proc/acpi/wakeup
echo USB2 > /proc/acpi/wakeup

switched them to disabled (checked by gedit /proc/acpi/wakeup again or refreshing the file-view), and after that, the computer stays in suspend like it should. :-)

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This solution did not work for me. PS2K was enabled (keyboard wakeup) but changing it made no difference. –  Bryce Oct 5 '12 at 19:15
+1 This worked for me. –  71GA Mar 6 '13 at 20:38
In my case there were no USB* devices, looks like they were internally connected through USB-hub: adding EHC1, EHC2 and XHC to /proc/acpi/wakeup helped me. –  Vladimir Rutsky Jun 8 at 18:43

Dell D600 wont sleep/hibernate with UBUNTU 11.10

Dell D600 was immediately waking after pushing sleep button. Problem solved by disabling Wakeup for LID. just had to type echo LID > /proc/acpi/wakeup similar to above

Before this, It wouldn't resume from sleep or hibernate at all until adding "quiet splash nomodeset" on the GRUB (nomodeset was the addition...quiet splash was already there). NOW ALL WORKS! No more Bugs with Dell D600 Latitude for Hibernate/Sleep with UBUNTU 11.10

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