目前使用开源ATI驱动的问题是有的时候鼠标所在的位置会花一小块，虽然也不是什么big deal,但是还是感觉不爽，今天网上偶尔看到有关于性能调整的文章，照做了，果然产生了效果。
#section device
Option "AccelMethod" "EXA" #default is XAA, EXA is faster
Section "DRI“
Mode 0666
EndSection
Section "Extensions"
Option "Composite" "Enable"
EndSection
早先是知道这些调整选项的，但是ubuntu自动配置之后运行起来没有什么问题，就没有去管它了。现在调整一下效果更好了，不错，呵呵。
另外，找到了一个在gnome dual monitors下控制窗口的脚本，原来是想自己开发使得metacity具有转换monitor, workspace的功能，其实借用wmctrl程序，结合一些其他的小工具，这个功能就可以实现了，然后绑定到一个快捷键，即可达到一键移动窗口的功能了，在这个小脚本里面wmctrl指令的使用并没有什么特殊性的，值得关注的作者使用一些小工具做到了找到当前活动窗口的功能，这里贴一下， 根据这个脚本还可以调整wmctrl指令参数，达到把窗口在workspace中间传送的功能哦。
#!/bin/bash
# swap_monitor.sh
# Moves the active window to the other screen of a dual-screen Xinerama setup.
#
# Requires: wmctrl, xprop, xwininfo
#
# Author: Raphael Wimmer
# raphman@gmx.de
# get monitorWidth
monitorLine=$(xwininfo -root | grep "Width")
monitorWidth=$((${monitorLine:8}/2 ))
echo $monitorWidth
# get active window id
activeWinLine=$(xprop -root | grep "_NET_ACTIVE_WINDOW(WINDOW)")
activeWinId="${activeWinLine:40}"
# get window position
xPosLine=$(xwininfo -id $activeWinId | grep "Absolute upper-left X")
xPos=${xPosLine:25}
# get window width
xWidthLine=$(xwininfo -id $activeWinId | grep "Width")
xWidth=${xWidthLine:8}
# calculate new window position
if (( ${xPos} + ${xWidth}/2 > ${monitorWidth} ))
then xPos=$(( ${xPos} - ${monitorWidth}))
else xPos=$(( ${xPos} + ${monitorWidth}))
fi
# make sure window stays on screen completely
(( ${xPos} < 0 )) && xPos=0
(( ${xPos} + ${xWidth} > 2 * ${monitorWidth} )) &&
xPos=$((2*${monitorWidth} - ${xWidth}))
echo ${xPos}
# if maximized store info and de-maximize
winState=$(xprop -id ${activeWinId} | grep "_NET_WM_STATE(ATOM)" )
if [[ `echo ${winState} | grep "_NET_WM_STATE_MAXIMIZED_HORZ"` != "" ]]
then
maxH=1
wmctrl -i -r ${activeWinId} -b remove,maximized_horz
fi
if [[ `echo ${winState} | grep "_NET_WM_STATE_MAXIMIZED_VERT"` != "" ]]
then
maxV=1
wmctrl -i -r ${activeWinId} -b remove,maximized_vert
fi
# move window (finally)
wmctrl -i -r ${activeWinId} -e 0,${xPos},-1,-1,-1
# restore maximization
((${maxV})) && wmctrl -i -r ${activeWinId} -b add,maximized_vert
((${maxH})) && wmctrl -i -r ${activeWinId} -b add,maximized_horz
# raise window (seems to be necessary sometimes)
wmctrl -i -a ${activeWinId}
# and bye
exit 0
