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我发现我的t440p的集成摄像头成绿色像，
root@t440p:~# lsusb -d 04f2:b39a -vvv
root@t440p:~# lsusb -d 04f2:b39a
Bus 003 Device 006: ID 04f2:b39a Chicony Electronics Co., Ltdroot@t440p:~# v4l2-ctl -V -d /dev/video0
Format Video Capture:Width/Height : 1280/720Pixel Format : 'MJPG'Field : NoneBytes per Line : 0Size Image : 1843200Colorspace : sRGBTransfer Function : DefaultYCbCr Encoding : DefaultQuantization : DefaultFlags :
最后从这个网页找到了答案 - https://help.ubuntu.com/community/Webcam/Troubleshooting
安装guvcview工具，将其中的"White Balance Temperature, Auto"打勾即可。
蓝牙键盘
蓝牙键盘配对后过一会超时后要重连，但经常重连不上。采用下列方法trust蓝牙之下情况好多了。
sudo apt-get install bluez bluez-tools$ bluetoothctl
[NEW] Controller 00:15:00:CB:B0:FF t440p #2 [default]
[NEW] Device 90:7F:61:00:23:C3 ThinkPad Compact Bluetooth Keyboard with TrackPoint
[NEW] Controller 00:1A:7D:DA:71:13 t440p #1# First, turn bluetooth power on (if your device is off)
[bluetooth]# power on
Changing power on succeeded# Then, make sure your agent is registered:
[bluetooth]# agent on
Agent registered
[bluetooth]# default-agent
Default agent request successful# Now you can scan for devices from the console
[bluetooth]# scan on
Discovery started
[CHG] Controller 00:15:00:CB:B0:FF Discovering: yes
...
[NEW] Device 90:7F:61:00:23:C3 ThinkPad Compact Bluetooth Keyboard with TrackPoint
...# You can manually pair from here as well
[bluetooth]# pairable on
Changing pairable on succeeded
[bluetooth]# pair 90:7F:61:00:23:C3[bluetooth]# trust 90:7F:61:00:23:C3
[CHG] Device 90:7F:61:00:23:C3 Trusted: yes
Changing 90:7F:61:00:23:C3 trust succeeded[bluetooth]# connect 90:7F:61:00:23:C3
[bluetooth]# quit
disable ingreated camera
#find integrated camera first, eg: it's /sys/bus/usb/devices/3-12/product
for device in $(ls /sys/bus/usb/devices/*/product); do echo $device; cat $device; done
#disable it
echo '3-12' |sudo tee /sys/bus/usb/drivers/usb/unbind
#enable it
echo '3-12' |sudo tee /sys/bus/usb/drivers/usb/bind