几天前，我将我的 Linux 机器升级到了 Ubuntu 14.04。之后，我注意到 Ubuntu 将不再挂起。暂停在 13.10 中工作正常。当我从菜单或终端执行“暂停”时sudo pm-suspend，屏幕变黑并显示以下几行：
[ 445.032801] PM: Syncing filesystems … done.
[ 445.057818] PM: Preparing system for mem sleep
[ 445.058006] Freezing user space processes --- (elapsed 0.001 seconds) done.
[ 445.059860] Freezing remaining freezable tasks … (elapsed 0.001 seconds) done.
[ 445.061194] PM: Entering mem sleep
[ 445.061247] Suspending console(s) (use no_console_suspend to debug)
有任何想法吗？