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My problem is the opposite of what is described in How to prevent resume from sleep/suspend on lid open?.

If I close my laptop's lid, it automatically suspends, but when I open it up again, nothing happens, and I have to press the power button to wake it up.
How can I make my laptop wake up from suspend when I open it's lid?

( It's an acer v5-171 running Ubuntu 13.10)

Community
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3 Answers3

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Have you seen this post? It looks like the method worked for one guy but not the other, so its not a guaranteed fix, but its worth a shot. : )

Here's a brief summary:

You can check whether the Lid open event is configured to wake up your OS by executing
cat /proc/acpi/wakeup. If the status of LID or LID0 is disabled you can try enabling it by executing

sudo -s
echo "LID" > /proc/acpi/wakeup

This will set the status to enabled, and executing the commands again will set it back to disabled.

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Ricardinyo
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  • Unfortunately that's not working. There's no LID device in /proc/acpi/wakeup. I tried enabling all disabled devices, but non of them did anything noticeable. –  Jan 09 '14 at 12:06
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    It could be that the laptop has no sensor for lid open. For example, I am quite convinced that this is the case for my Samsung Chronos 7. So in this case resume on lid open is impossible... does it work in other OSes? – Rmano Jan 09 '14 at 16:38
  • If closing the lid makes it suspend, it would follow that there is a sensor. Generally the screen will at least turn off when you close the lid of a laptop, so I assume there must be one. – Ricardinyo Jan 09 '14 at 16:50
  • @Rmano I only ever had Ubuntu on this machine, so I can't answer that. However it clearly knows when it's closed so there must be a sensor for it. Another possibility is that there's no BIOS support for this feature. –  Jan 09 '14 at 17:56
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    Just because there's a sensor to detect the lid clsoing doesn't mean that there's an event generator in the laptop and it's BIOS to generate a wake up even when it's opened. MOST laptops do not generate lid open events. Of the 10 or so I've used and owned int e the last few years only two do, my Asus N56 and my Acer Chromebook. – Scott Marlowe Jan 15 '14 at 03:21
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This needs to be supported by hardware through a sensor for the lid-open event. Unless your hardware supports it, there would be "no-one" who will get notified of the "lid-open" event, and wake your laptop.

Bhavin Doshi
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Go to system utilities and then go to system settings. From there you will pick boot options and scroll down until you see power up on lid opening. Activate and apply.

Mark
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