@Phillip Susi: That was a really interesting hint! Here are my results using sudo sh -c "echo 'core' > /sys/power/pm_test"
1. GPU present (with Nvidia driver), fans kept running and machine was stuck (no ping, no keyboard, no video signal). dmesg after reboot: http://pastebin.com/wpmxaU3C 2. No GPU present (but Nvidia driver still installed), it correctly suspended and resumed after a few seconds. dmesg: http://pastebin.com/UMt1aj2q 3. GPU present (Nvidia driver removed, nouveau driver installed), it correctly suspended and resumed after a few seconds. dmesg: http://pastebin.com/wC6VitEc ------ 4. no echo "core" GPU present, Nvidia driver removed, nouveau driver installed, regular pm-suspend ---> machine stuck and multiple reboots -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/760842 Title: Natty Narwhal/Sandy Bridge Suspend Fails -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
