I have solved this problem by changing the ACPI configuration as described in the link I have added in my last comment. I anyway had to change the defaukt configuration which comes with Ubuntu.
** Changed in: linux (Ubuntu) Status: New => Invalid ** Converted to question: https://answers.launchpad.net/ubuntu/+source/linux/+question/86154 -- [Acer, inc. Aspire 5920G] hibernate/resume failure [non-free: nvidia] https://bugs.launchpad.net/bugs/449071 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs