Here's a few things you can try to help with diagnosing the problems. In addition to trying the following steps, please also report back whether or not your machine has a built-in serial port.
The first thing to check is whether the machine is actually hung or if the display just isn't working properly. After attempting to resume from suspend, try pinging your device on the network or logging in over ssh. If the machine is unresponsive, you should boot with the no_console_suspend option, then run the following tests. Probably the easiest thing for you to do is modify the file /etc/default/grub in a text editor (using sudo). Modify the line that reads GRUB_CMDLINE_LINUX="" to read GRUB_CMDLINE_LINUX="no_console_suspend" After saving the file, run 'sudo update-grub' in a terminal. Now you will boot with the no_console_suspend option each time you boot. You can later remove the option by removing the option from /etc/default/grub and rerunning update-grub. After rebooting, press Ctrl-Alt-F1 to switch to virtual terminal 1. Log in and run 'sudo pm-suspend'. If the device suspends successfully, press the power button to resume. If there's anything displayed on the screen when the machine hangs, take a picture of it and attach it here. Otherwise, please try the steps on the following wiki page and report back what you find. https://wiki.ubuntu.com/DebuggingKernelSuspend Thanks! -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/815942 Title: Screen getting locked when laptop is idle To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/815942/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
