You are still using an old version of ALSA, 1.0.20-21 (it is shown in the
Install the latest ALSA for your distribution from the ALSA PPA:
This is ALSA 1.0.24. So you can keep your current version of Ubuntu and have the latest ALSA kernel module. Once you install the latest ALSA, reboot your computer.
Test if sound automatically works. If it does not work, check to see if you still see the following message (by running
[ 7.422678] hda_codec: ALC268: BIOS auto-probing.
If you still see this message, then ALSA does not know the details of your sound card, and you need to add these details yourself. I'll add details for this if it is still the case.
So you still see the message about
ALC268: BIOS auto-probing.
If that is the case, visit:
Check the section about ALC268. It is
quanta-il1 Quanta IL1 mini-notebook
3stack 3-stack model
toshiba Toshiba A205
acer Acer laptops
acer-dmic Acer laptops with digital-mic
acer-aspire Acer Aspire One
dell Dell OEM laptops (Vostro 1200)
zepto Zepto laptops
test for testing/debugging purpose, almost all controls can
adjusted. Appearing only when compiled with
auto auto-config reading BIOS (default)
The auto-probing message means that the
auto facility in ALSA did not identify the correct sound chip, and you will have to set it explicitly. Your options are
toshiba, etc. Depending on your laptop brand, start with the most relevant models.
You need to:
Edit the file
/etc/modprobe.d/alsa-base.conf by running:
gksu gedit /etc/modprobe.d/alsa-base.conf
Add or (if it already exists) edit the line
options snd-hda-intel model=XXXXXXXX
XXXXXXXX with one of the available models. Restart the computer and check if the sound is fixed. Repeat until your try out all other models.
Once you find the correct model, you are done! But please report back to describe the next step which involves informing the ALSA project about your sound card. That way, your computer's sound may work out of the box in the next version of Ubuntu!