Linux - Ubuntu Jaunty on a Dell D630

After a successfull install on a newer laptop (Dell E6400) I was disappointed to see a couple of troubles when I upgraded my older Dell D630 from hardy to jaunty:

CPU Frequency

Until now I couldn't get the automatic CPU frequency scaling to run. The gnome CPU frenquency applet showed a randomly frequency changing in a range from 800Mhz to 1.2Ghz, although I have a 2.5Ghz dual core (!). I decided to permantly fix CPU frequency to 2.5Ghz. In /etc/init.d/ondemand, the line

echo -n ondemand > $CPUFREQ

has to be replaced with

echo -n performance > $CPUREQ

Video

Graphics performance was catastrophical even without compiz, which didn't run anyway. I needed to switch back to the previous version of xorg:

sudo apt-get install xserver-xorg-video-intel-2.4

and I added the following lines to /etc/X11/xorg.conf:

Section "DRI"
Mode 0666
EndSection

Section "Extensions"
Option "Composite" "Enable"
EndSection

I am still not totally happy with the performance of the system, in particular in combination with an external Dell 22" screen.

Sound

OK ... almost. The overall sound level was low after the installation even when all sliders where on max, but I could raise levels with alsamixer.

Wired LAN

Wireless LAN

Unencrypted networks worked immediately, but I couldn't connect to networks encrypted with WPA. After searching around on the web I found that installing the backports solved the problem:

sudo apt-get install linux-backports-modules-jaunty wpasupplicant