solved (I think). I've updated the bios. You can find the latest bios on acer support site. In this way I solved the freezes and also the system appears faster.
Little problem: you must use windows to update the bios. p.s. i don't know if we can consider this bug totally solved, because with windows I had no problem. -- System random freeze, using ubuntu karmic and jaunty on acer 5738G https://bugs.launchpad.net/bugs/489360 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