Jaunty Jackalope on Dell Studio 15

I recently bought a Dell Studio 15 laptop. I installed Ubuntu 9.04 (Jaunty Jackalope) on it. I faced a few problems which my friend Saugata aka Jones and myself resolved one by one.
Initially the problem was with the bluetooth mouse: using this link this problem was resolved.
Next, the problem with sound; The path to success lay in installing and running gnome-alsamixer.

sudo apt-get install gnome-alsamixer

and edit the file /etc/modprobe.d/alsa-base.conf to add to the end:

options snd-hda-intel model=dell-m6

So, anyone interested in a Dell Studio 15 (or 17) with the recent versions of Ubuntu should see this site. Unfortunately the original site is in French; so some of the translations could be misleading. For example the 4th column for 'At a glance' table should be read as 'Sound' which runs with Jaunty only after some manipulations.

I still have a problem which has not been resloved; there is a very sharp beep when I logout. It is irritating & sometimes with earphones it can be really a pain in the ears !