Dual Head Configuration Options

ubuntu 5.04, dell lattitude d410, i915 video card
现象：
默认安装后不支持双头显示，fn+f8会黑屏，且无法返回。
尝试：
然后试验了几个软件，i810switch和i855crt，效果都不好。i855的功能很好，可惜在i915上无法工作（即使我重新编译了，让其认识了i915卡，也还不行）。

解决办法：

后来，在intel的官方网站看到了其readme，知道了几个参数，在xorg.conf中添加后就可以了。
在DEVICE项中添加：
Option “MonitorLayout” “CRT,LFP”
Option “Clone” “true”
若有别的要求，可仔细看其readme。

下一步，可以看看如何作两个显示器分别不同的内容。（或分成不同的桌面）
在网络上，还有进一步的要求，等以后再处理了。
参考：
ftp://aiedownload.intel.com/df-support/8211/ENG/readme.txt

************************************************************
* 7. Dual Head Configuration Options
************************************************************

These options can be added to the Device section to furthur
configure dual head modes.

Option “MonitorLayout” “anystr”

Allow different monitor configurations. e.g. “CRT,LFP” will
configure a CRT on Pipe A and an LFP on Pipe B. Regardless of
the primary heads’ pipe it is always configured as “,
“. Additionally you can add different configurations
such as “CRT+DFP,LFP” which would put a digital flat panel and
a CRT on pipe A, and a local flat panel on pipe B. For single
pipe configurations you can just specify the monitors types on
Pipe A, such as “CRT+DFP” which will enable the CRT and DFP on
Pipe A. Valid monitors are CRT, LFP, DFP, TV, CRT2, LFP2, DFP2,
TV2 and NONE. NOTE: Some configurations of monitor types may
fail, this depends on the Video BIOS and system configuration.
Default: Not configured, and will use the current head’s pipe
and monitor.

Option “Clone” “boolean”

Enable Clone mode on alternate pipe. This will setup the second
head as a complete mirror of the monitor attached to the primary
pipe. NOTE: Video overlay functions will not work on the second
head in this mode. If you require this, then use the MonitorLayout
above and do (as an example) “CRT+DFP,NONE” to configure both a
CRT and DFP on Pipe A to achieve local mirroring and disable the
use of this option. Default: Clone mode on the alternate pipe is
disabled.

Option “CloneRefresh” “integer”

When the Clone option is specified we can drive the second monitor
at a different refresh rate than the primary. NOTE: This override
will only work if the Clone head is a CRT. Default: 60.