Installing Ubuntu on a ThinkPad T23

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Ubuntu 8.04 Hardy Heron

The upgrade from Gutsy to Hardy goes fairly smoothly.


The following features quit working after the upgrade:

  • Having Caps Lock work as a second Control key works, but the Caps Lock status light toggles on and off as Control is pressed, giving the impression that Caps Lock is actually on. This is set in System: Preferences: Keyboard: Layouts: Layout Options: Ctrl Key Position. Track Ubuntu Bug #173350 for the latest updates.
  • On Screen Display of special key actions quits working. The keys include the brightness and volume adjustment keys, as well as mute. bug report has been filed about this, and you can subscribe to it to follow the progress. A workaround is to boot the 2.6.22 kernel

supplied with Gutsy. This is already on your system by default after an upgrade from Gutsy to Hardy. See ChangeDefaultOS for details on how to change the "default" line in /boot/grub/menu.lst and then run sudo update-grub' for the change to take effect.


Also, the issue with "sound after suspend" described below in the Gutsy section remains with Hardy.

Ubuntu 7.10 Gutsy Gibbon

Things generally work fine, with the following notes

Power Management

Sound After Suspend

Sound may not work after a suspend/resume cycle. The problem may be that some volume levels have been muted. To fix that save the following into a script:

mixers="Master PCM CD"
for mixer in $mixers ; do
  /usr/bin/amixer -q sset $mixer mute
  /usr/bin/amixer -q sset $mixer unmute

The script should save to /etc/acpi/resume.d/ Make sure the file is executable

chmod +x  /etc/acpi/resume.d/

In theory, that should make sound work automatically after suspend. It still may not, but you can run the script manually to bring sound back:

 sh /etc/acpi/resume.d/

Dual Monitors

Gutsy Gibbon has a new "Screens and Graphics" preferences area. It shows a second monitor possibility. Trying a test does make both the LCD and external screen active as one big gray monitor...but only for the test. Choosing the option to accept the settings does not actually cause monitor-spanning to work, but monitor mirroring does.

CPU Frequency Scaling

CPU Frequency Scaling seems to be working automatically. To see your current speed level, activate the CPU Frequency Scaling Monitor Applet. Right click on the toolbar and select "add to panel". You can search for "Frequency" to find it.

Ubuntu 7.04 Feisty Fawn

Power Management

The chips in T23s have the ability to run at speeds slower than their maximum, in order to save power. To see your current speed level, activate the CPU Frequency Scaling Monitor Applet. Right click on the toolbar and select "add to panel". You can search for "Frequency" to find it.

You can also enable this applet to allow you manually change the speed and scaling policy. To do that, run this in a terminal: "sudo dpkg-reconfigure gnome-applets".

These instructions are also available illustrated with screenshots.

You may also need to add a couple of lines to "/etc/modules" to allow you to be able to change the processor speed and governor. The lines are:


These will now be loaded on at boot time. To activate them immediately:

 sudo modprobe acpi-cpufreq
 sudo modprobe cpufreq_ondemand

Some technical details are explained on the SpeedStep page.

External Resources