Acer 4820TG - problem with a microphone and a headset on Linux

My headset ports didn't work on Ubuntu 10.04 64bits until I ran a command below and restarted my computer:

sudo apt-get install linux-backports-modules-alsa-lucid-generic

Information about it I found on this forum:
http://ubuntuforums.org/showthread.php?t=1046137&page=104

Acer 4820TG - a problem with graphics cards on Linux

Recently I was struggling with running Ubuntu 10.04 on Acer Aspire Timeline X 4820TG. After I installed ATI/AMD proprietary FGLRX graphics driver X didn't start. I didn't have time to solve the problem properly but I found out that after I've changed SWITCHABLE mode to DISCRETE in a BIOS settings for graphics cards I'm able to start Ubuntu properly.