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<H2>Dell Latitude D400 with Gentoo Linux</H2>
Well, I've got one from my boss and I had some trouble getting the Framebuffer Console, XORG and the video to work after reopening the lid. 
Here is my kernel-2.6.22-r6 <A HREF="config">config</A> and my <A HREF="xorg.conf">xorg.conf</A>. 
(I guess you want to change some stuff in the kernel config, as I build in IPSec and Bluetooth, and some IPtables / network stuff.) 
<HR>
Install net-wireless/bcm43xx-fwcutter in order to get bcm43xx to work; do "ifconfig eth3 up" before trying anything wireless. 
FN+F2 works out of the box, watch you /var/log/messages :) 
The <A HREF="http://patches.aircrack-ng.org/bcm43xx-injection-linux-2.6.20.patch">bcm43xx-injection-linux-2.6.20.patch</A> works also fine with kernel 2.6.21 (not testet with 2.6.22 yet). 
<HR>
You also need to install the <A HREF="http://www.geocities.com/stomljen/">915resolution</A> tool which fixes the faulty BIOS. 
My 915resolution config can be downloaded <A HREF="915resolution">here</A>. 
<HR>
For CPU governours I recommend using ondemand (which is the default). Be sure to have the acpi USE-flag enabled!
<PRE>
emerge sys-power/cpufreqd
emerge sys-power/cpufrequtils
/etc/init.d/cpufrequtils start
rc-update add cpufrequtils boot
</PRE>
<HR>
For powersaving with USB also add the line:
<PRE>
"usbcore autosuspend=1"
</PRE>
to your bootloader.
<HR>
Enable power saving for the AC97 codec: 
<PRE>
echo 'echo 1 > /sys/module/snd_ac97_codec/parameters/power_save' >> /etc/conf.d/local.start
</PRE>
<HR>
More Power-saving methods:
<PRE>
echo 5 > /proc/sys/vm/laptop_mode
echo 1500 > /proc/sys/vm/dirty_writeback_centisecs
</PRE>
For saving most power, you could also do cpufreq-info, see the lowest CPU frequency and then do cpufreq-set -f 600.
<HR>
To get the multimedia keys to work with your special X-config, follow the instructions I found at the <A HREF="http://gentoo-wiki.com/HOWTO_Use_Multimedia_Keys">gentoo-wiki HOWTO</A>. 
For me (fluxbox user!), this worked:
<PRE>
cat ~/.Xmodmap
keycode 174 = XF86AudioLowerVolume
keycode 176 = XF86AudioRaiseVolume
keycode 160 = XF86AudioMute

echo "/usr/bin/xmodmap $HOME/.Xmodmap" >> ~/.xsession

tail -n3 ~/.fluxbox/keys:
None XF86AudioLowerVolume :ExecCommand amixer -q set PCM 2- unmute
None XF86AudioRaiseVolume :ExecCommand amixer -q set PCM 2+ unmute
None XF86AudioMute :ExecCommand amixer -q set Master toggle
</PRE>
<HR>
To get the video work properly after opening the lid, you'll need to do this: 
Only try with xf86-video-i810-1.7.4 (newer versions up to 2.1.1 are buggy and cannot switch VT!).
First install the unstable vbetool version (currently 0.7):
<PRE>
echo "sys-apps/vbetool ~x86" >> /etc/portage/package.keywords
emerge sys-apps/vbetool
</PRE>
Then create /etc/acpi/events/lid containing this:
<PRE>
event=button[ /]lid
action=/etc/acpi/actions/lid
</PRE>
and /etc/acpi/actions/lid containing this:
<PRE>
#!/bin/bash
lid_state=/proc/acpi/button/lid/LID/state
test -e $lid_state || exit 0

if grep open $lid_state &>/dev/null
then
	curcons=`fgconsole`
	chvt 2
	vbetool post
	chvt $[curcons%6+1]
	chvt $curcons
fi
					
# leave this out, if you do not want your laptop to go to sleep when closing the lid
if grep closed $lid_state &>/dev/null
then
	acpitool -s
fi
</PRE>
Finally, do this:
<PRE>
chmod +x /etc/acpi/actions/lid 
emerge sys-power/acpid
rc-update add acpid default
/etc/init.d/acpid start
</PRE>
<HR>
I also STRONLY recommand to give <A HREF="http://www.linuxpowertop.org/">powertop</A> a try! 
In short words, it will find the programs that prevent your Laptop from sleeping ;) 
 
Generic info: 
- <A HREF="lspci">lspci output</A> 
- <A HREF="cpuinfo">/proc/cpuinfo</A> 
- BIOS Revision A08. You may Download an upgrade from Dell <A HREF="http://support.dell.com/support/downloads/format.aspx?c=us&l=en&s=gen&deviceid=3249&libid=1&releaseid=R104377&vercnt=2&formatcnt=0&SystemID=LAT_PNT_PM_D400&servicetag=&os=WW1&osl=GE&catid=-1&impid=-1">here</A>. 
 
<HR>
<PRE>Written by Stefan Behte
Contact me, if you have any new ideas, bugs/bugfixes, recommondations or questions!
Please also contact me, if you just like the tool. :)
 
Stefan dot Behte at gmx dot net

Released under the <A HREF="http://www.gnu.org/copyleft/gpl.txt">GPL-v2</A>
</PRE>
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