hRecent updates have broken functionality of both the fingerprint reader and screen brightness adjustment on my laptop (Thinkpad X61 Tablet with Ubuntu 8.10).
The problem with the fingerprint was that a recent security update had overwritten the /etc/pam.d/*-auth files (it allerted me to this beforehand, but to prevent issues with the update I allowed it to totally overwrite my files). If this happened to you, all you need to do is run the script to edit the /etc/pam.d/common-auth file to allow the fingerprint reader to be a method of authentication.
run the following command:
nothing should return, but when you restart the authentication daemon (I don’t remember the command offhand, so I just restarted the computer) the fingerprint reader should work again.
Fixing ACPI Brightness Adjustment
After updating to the 2.6.27-11 kernel, brightness controls would not work for me or any of my friends with the Thinkpad X61 laptop. There is not an update released yet to fix this, and it has been marked as “low priority”. The low priority kind of makes me upset since sometimes I can’t even see my laptop screen because of it’s low screen brightness, and other times I get half of the battery life I’m used to since the brightness is all the way up.
Anyway, the fix I found for this was on the issue’s bug report.
In order to do this, you need to edit the /etc/modprobe.d/options file and add the line “options thinkpad_acpi brightness_enable=1”. There are many ways to do this, but my preferred is the following:
in a terminal, type:
sudo nano /etc/modprobe.d/options
then arrow down to the bottom, and then type:
# set to get brightness controlls working in 18.104.22.168 kernel
options thinkpad_acpi brightness_enable=1
exit by pressing ctrl-x then enter to save and overwrite the file. Now you can reboot and the brightness control should work just fine.
If you have any questions or the problems are not fixed by these then leave a comment.