我终于找到了（或者说查看路由日志时想通了）之前断网的原因。
使用移动的校园宽带。每次登录限制2天。2880min。然后就会被服务器端断掉，然后网卡就shutdown了。
现在不知道算不算是bug。。。
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这是第二次遇到，所以报告了。不知道该发在那里，也不知道该填写什么信息。
挂机下东西，期间不曾关机，网卡一直工作，刚才突然掉线，通知栏里显示“设备未托管”。
拔插网线无效，想起当初是reboot解决的。所以试了下
代码:
sudo service network-manager restart
然后正常了。没刻意测试过网卡工作时间，估计超过20小时了。
代码:
ubuntu 12.04 amd a8 3520m
3.2.0-23-generic-pae #36-Ubuntu SMP Tue Apr 10 22:19:09 UTC 2012 i686 athlon i386 GNU/Linux
lspci -v 节选
代码:
02:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter (rev 01)
Subsystem: Hewlett-Packard Company Device 1629
Flags: bus master, fast devsel, latency 0, IRQ 16
I/O ports at 3000 [size=256]
Memory at f0200000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number 01-91-81-fe-ff-4c-e0-00
Kernel driver in use: rtl8192ce
Kernel modules: rtl8192ce
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 05)
Subsystem: Hewlett-Packard Company Device 3565
Flags: bus master, fast devsel, latency 0, IRQ 42
I/O ports at 2000 [size=256]
Memory at f0004000 (64-bit, prefetchable) [size=4K]
Memory at f0000000 (64-bit, prefetchable) [size=16K]
Capabilities: [40] Power Management version 3
Capabilities: [50] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [70] Express Endpoint, MSI 01
Capabilities: [b0] MSI-X: Enable- Count=4 Masked-
Capabilities: [d0] Vital Product Data
Capabilities: [100] Advanced Error Reporting
Capabilities: [140] Virtual Channel
Capabilities: [160] Device Serial Number 00-00-00-00-00-00-00-00
Kernel driver in use: r8169
Kernel modules: r8169
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