我刚刚在 Dell Latitude E6420 上安装了 Linux Mint 16 Cinnamon。使用一小时后，桌面将变得无响应，并且我无法访问任何 TTY。它只是冻结了。强制重启后又出现同样的情况。
我再次启动，整个过程都很好，大约一个小时。我让计算机进入睡眠状态（挂起），第二天早上醒来时它会冻结。
我查了一下/var/log/syslog，发现了一些我无法理解的地方。查看 00:06 计算机进入睡眠状态和 07:57 计算机唤醒之间的时间。具体来说这一行：
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.146134] Freezing user space processes ... (elapsed 0.001 seconds) done.
为什么 Mint 唤醒后会冻结用户进程？
Apr 16 23:57:47 NIX-E6420 modem-manager[793]: <info> (ttyS4) closing serial port...
Apr 16 23:57:47 NIX-E6420 modem-manager[793]: <info> (ttyS4) serial port closed
Apr 16 23:57:47 NIX-E6420 modem-manager[793]: <info> (ttyS4) opening serial port...
Apr 16 23:57:53 NIX-E6420 NetworkManager[843]: <info> (eth0): IP6 addrconf timed out or failed.
Apr 16 23:57:53 NIX-E6420 NetworkManager[843]: <info> Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) scheduled...
Apr 16 23:57:53 NIX-E6420 NetworkManager[843]: <info> Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) started...
Apr 16 23:57:53 NIX-E6420 NetworkManager[843]: <info> Activation (eth0) Stage 4 of 5 (IPv6 Configure Timeout) complete.
Apr 16 23:57:59 NIX-E6420 modem-manager[793]: <info> (ttyS4) closing serial port...
Apr 16 23:57:59 NIX-E6420 modem-manager[793]: <info> (ttyS4) serial port closed
Apr 16 23:57:59 NIX-E6420 modem-manager[793]: <info> (ttyS4) opening serial port...
Apr 16 23:58:05 NIX-E6420 modem-manager[793]: <info> (ttyS4) closing serial port...
Apr 16 23:58:05 NIX-E6420 modem-manager[793]: <info> (ttyS4) serial port closed
Apr 16 23:59:46 NIX-E6420 dbus[498]: [system] Activating service name='org.freedesktop.timedate1' (using servicehelper)
Apr 16 23:59:46 NIX-E6420 dbus[498]: [system] Successfully activated service 'org.freedesktop.timedate1'
Apr 16 23:59:46 NIX-E6420 dbus[498]: [system] Activating service name='org.freedesktop.systemd1' (using servicehelper)
Apr 16 23:59:46 NIX-E6420 dbus[498]: [system] Successfully activated service 'org.freedesktop.systemd1'
Apr 17 00:02:20 NIX-E6420 kernel: [ 295.630421] nouveau W[ PFIFO][0000:01:00.0] INTR 0x01000000: 0x00000005
Apr 17 00:06:31 NIX-E6420 kernel: [ 546.940568] PM: Syncing filesystems ... done.
Apr 17 00:06:31 NIX-E6420 kernel: [ 546.942332] PM: Preparing system for mem sleep
Apr 17 07:57:55 NIX-E6420 NetworkManager[843]: <info> (eth0): carrier now OFF (device state 100, deferring action for 4 seconds)
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.146134] Freezing user space processes ... (elapsed 0.001 seconds) done.
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.147354] Freezing remaining freezable tasks ... (elapsed 0.001 seconds) done.
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.148469] PM: Entering mem sleep
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.148546] Suspending console(s) (use no_console_suspend to debug)
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.169317] sd 1:0:0:0: [sdb] Synchronizing SCSI cache
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.169368] sd 1:0:0:0: [sdb] Stopping disk
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.169394] sd 0:0:0:0: [sda] Synchronizing SCSI cache
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.169651] sd 0:0:0:0: [sda] Stopping disk
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.186790] nouveau [ DRM] suspending fbcon...
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.186793] nouveau [ DRM] suspending display...
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.186813] nouveau [ DRM] unpinning framebuffer(s)...
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.186902] nouveau [ DRM] evicting buffers...
Apr 17 07:57:55 NIX-E6420 kernel: [ 547.187841] mei_me 0000:00:16.0: suspend