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Ubuntu 12.04 monitor goes to sleep and won't wake up

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http://askubuntu.com – We have about 80 systems running ubuntu 12.04 64bit desktop edition. We are facing a strange problem. Everything works fine except that after the monitor goes to sleep, if we don't wake it for long time then it stucks and won't wake up even if we keep pressing any key. But all tty consoles are working. Also i checked the syslog and it was showing the following warning message: lightdm: pam_ldap: could not open secret file /etc/ldap.secret (No such file or directory) Also if i pull out the power cable of monitor and insert it back (once the monitor LED goes from orange to black), the screen c (HowTos)

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Submitted by Songlist on 10/19/2012

Stories similar to Ubuntu 12.04 monitor goes to sleep and won't wake up

Hi all,

I have a usb mouse connected to my ubuntu machine through the usb hub on my monitor. Normally it works just fine. However, when the monitor goes to sleep and wakes up, the mouse no longer works.

The scenario is like this:

- the computer is in use, mouse works just fine

Karmic 9.10

Hallo, I'm running Ubuntu 12.04 with latest updates on HP desktop computer with embed sandy bridge intel graphic card and onboard display port connector. The problem is that, when the monitor goes to sleep and it is connected to the display port, it will never wake up. I have to hard restart the computer.

So, I face a pretty menacing problem with Ubuntu 12.10. While browsing through google or any other site for that matter my monitor decides for absolutely no reason whatsoever to go to sleep, WITHOUT WARNING and the only way to wake it back up is literally by restarting the PC.

Answers to likely questions:

1.

FC18 RC2, with today's updates, here is having problems waking from suspend.

This is a desktop, not a laptop. It appears to go into suspend mode correctly. When I attempt to wake it, the LED's on my monitor indicate the screen is awake, but the screen remains dark except for a flashing cursor in the top left corner. It is not responsive to the keyboard.

I recentlly built a similar system (i7 with integrated Intel HD 4000), and I'm seeing the same behaviour that graysky reported. When my monitor goes to sleep, moving the mouse or typing on the keyboard does not wake it up. I have to CTRL+ALT+F1 which does wake it up. Then I have to CTRL+ALT+F7 to get back to X. This happens with SNA acceleration, but not with UXA.

Hi, I just recently switched from Ubuntu to Fedora 11, and noticed that the very same thing that was bugging me with Ubuntu behaves the same with Fedora. Although I have configured APM to put the monitor to sleep, it only appears to display a black screen. I can tell 'cause the backlight of the TFT monitor remains lid. I had this very same problem with Ubuntu, in both Gnome and KDE environments.

My situation:

Ubuntu 10.10 running on an Atom driven main board The main board has a GPIO chip integrated (F75111 by Fintek).

They communicate through I2C (SMBus). We have a driver running that works, we can send outputs and read inputs. Great!

We would like to use the I/O interface to suspend (sleep) and wake up again.

Sleep is no problem. On an incoming input: run s2both.

Hi, I am using ubuntu 11.04 with a thinkpad x300. It used to suspend and wake up properly, but since last month, when coming up from suspend all turns on except the monitor and the only possibility I found to turn it on is to restart the computer. I tried to run ubuntu from an usb key, and it goes to sleep and wakes up correctly, so it should be a software problem Hibernation works fine.

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