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[[TableOfContents]]
Once again I installed [http://debian.org Debian] on a notebook. This time on a friends [http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-4L3J5R IBM Thinkpad X20]. This is not exactly spectacular, but I ran into some small problems, which I want to write down as a reference for others.

Please feel free to edit and extent this howto.

= ingredients =
[http://thinkwiki.org/wiki/Category:X20 Thinkwiki.org] tells you something about the ingredients of this notebook.

= compatibility =
The table below shows compatibility with kernel >= 2.6.15. Everything highlighted in green is fully supported. Orange means particularly supported and everything in red isn't supported at the moment.

||<rowbgcolor="#FFFFE0">component ||<rowbgcolor="#FFFFE0">comment ||
|| '''[[Color(green:chipset)]]''' || ||
|| '''[[Color(green:processor)]]''' || ||
|| '''[[Color(green:video card)]]''' || ||
|| '''[[Color(green:sound card)]]''' || ||
|| '''[[Color(green:modem)]]''' || not tested - visit [http://thinkwiki.org/wiki/Category:X20 Thinkwiki] for more information ||
|| '''[[Color(green:ethernet devic[[1]]]''' || ||
|| '''[[Color(green:trackpoint)]]''' || ||
|| '''[[Color(green:CF-Card slot)]]''' || not tested - visit [http://thinkwiki.org/wiki/CF_Card_slot Thinkwiki] for more information ||
|| '''[[Color(green:special key[[1]]]''' || ||

-----
= installation =
Before installing Linux on your notebook make sure it runs the [http://thinkwiki.org/wiki/BIOS_Upgrade#X_Series latest Bios (v 2.25) and "Embedded Controller Program" (v 1.36)]. Without these updates you may experience [#fan problems] with its fan. Though there are only update utilities for Windoze and DOS you have the choice:
 * Update these programs without Windoze by following the instructions from [http://thinkwiki.org/wiki/BIOS_Upgrade Thinkwiki].
 * Install Windoze and update these programs. I think IBM/Lenovo won't update the Bios and "Embedded Controller Program" any longer (last version is from 2003) - it's save to delete Windoze after the update.

There are [http://thinkwiki.org/wiki/Installation_on_ThinkPads_without_CD-ROM_drive several possibilities] to install Debian though it hasn't a built-in CD-ROM drive. The easiest approach is to use an external USB-drive.

The installation of Debian Etch ([http://www.debian.org/devel/debian-installer/ Debian Installer Etch beta 2]) worked smoothly.

-----
= configuration =
== kernel ==
Because of some problems with Speedstep (have a look at the FAQ) I compiled my own kernel. The [attachment:config .config]-file is slightly different from Debian's standard.

== x.org ==
Nothing spectacular. Here is the [attachment:xorg.conf xorg.conf].

-----
= faq =

 Speedstep doesn't work::

After trying to load speedstep modules the following message appears:
{{{FATAL: Error inserting speedstep_smi (/lib/modules/2.6.15-1-486/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-smi.ko): No such device}}}

To get this working you'll need a kernel with this option enabled:
{{{
CONFIG_X86_SPEEDSTEP_RELAXED_CHECK = y
}}}

That's the case with recent Debian kernels. Go on and disable the speedstep-lib checks by by creating a /etc/modprobe.d/speedstep-lib file with this content:
{{{
options speedstep-lib relaxed_check=1
}}}

And then, you may add these 2 lines to /etc/modules:
{{{
speedstep-lib
speedstep-smi
cpufreq_powersave
}}}

Further informations concerning speedstep can be found here: [http://www.thinkwiki.org/wiki/How_to_make_use_of_Dynamic_Frequency_Scaling thinkwiki].
----
 Speedstep still doesn't work::

You have disabled the speedstep-lib checks like explained above, but speedstep still doesn't work with kernels <=2.6.15? It's a [http://bugzilla.kernel.org/show_bug.cgi?id=5553 kernel bug]. Try to enable this kernel option:
{{{
CONFIG_CPU_FREQ_DEBUG = y
}}}

----
 Speedstep does work but I can't use ondemand governor::

This governor doesn't work on older laptops without Enhanced Speedstep (and guess: the X20 is a "plain-speedstep" notebook).

----
 Starting with kernel 2.6.16 my soundcard doesn't work::

The alsa driver fails to probe the sound chip:
{{{
PCI: Found IRQ 5 for device 0000:00:0b.0
...
never read ISV3 and ISV4 from AC'97
CS4281: probe of 0000:00:0b.0 failed with error -5
}}}

It's a [http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=361197 bug]. Wait until it'll be fixed or switch back to kernel 2.6.15.

----
[[Anchor(fan)]]
 The fan is very noisy and doesn't stop working::

You need to update the "Embedded Controller Program" to version 1.36 and the Bios to 2.25. The bad news: IBM only provides update utilities for Windoze and DOS. A friend runs Windoze on his notebook. So I changed the harddisks and installed the update. [http://thinkwiki.org/wiki/BIOS_Upgrad Thinkwiki] tells you how to proceed without Microsoft Software.
 * "Embedded Controller Program" [http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-4VQNTP Windoze version] / [http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-4PBMCT DOS version]
 * Bios [http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=MIGR-4P52BM Windoze version] / [http://www-307.ibm.com/pc/support/site.wss/document.do?sitestyle=lenovo&lndocid=MIGR-4P52BL DOS version]

----
 3Com 10/100 Ethernet card is not being recognized::

This is a problem with all Linux kernels prior to 2.6.14-rc1. Update your kernel or have a look at [http://thinkwiki.org/wiki/Problem_with_3Com_10/100_Ethernet_card_not_being_recognized Thinkwiki]

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