I have a new Lenovo z475 that I loaded Ubuntu 12.10 amd64+mac version onto. Everything works well except when I open the lid of my laptop after having closed it. It seems to freeze. I can't ping it or anything. I have AMD Vision Chipset. I have a Radeon HD 6520G using the x.org driver.
/etc/pm/sleep.d/10_unattended-upgrades-hibernate suspend suspend: success. Running hook /usr/lib/pm-utils/sleep.d/55NetworkManager suspend suspend: Having NetworkManager put all interaces to sleep...Failed.