External sound output doesn't work on Lenovo thinkpad

[neojamin]

Hi everyone,

I just installed ubuntu 10.04 on my Lenovo thinkpadedge laptop, I had the 11.04 version before and just downgraded. Everything works fine beside the fact that headphones or external speakers don't work. I connect them and the sound keep coming out of the internal speakers.

I check with the alsa project and they give me this link:
http://www.alsa-project.org/db/?f=9b...7562940d575a2b

I don't really understand it and don't know what I could or should do.

Thanks a lot for you help in advance!

Ben

[Jon Monreal]

I've actually experienced a similar problem before.

Firstly, could you try opening a terminal and typing "alsamixer" and pressing enter, and seeing what it says for items such as "Headphone"? If it says "MM," that means that the device is muted (which presents a problem, because even if you unmute it it would likely still play from the internal speakers). If it doesn't appear at all, then there are other problems.

Thanks.

[neojamin]

Hi, thanks for replying so quick! I did Alsamixer and there are nothing about headphones, only pcm and master which have a colorful bar and S/PDIF defaut and 1 that have 00.

Do you have any idea waht it could be!?

Thanks a lot!

[Jon Monreal]

Can you give me a more detailed model number for your laptop? That could help me identify what hardware you have and attempt to come up with a solution.

Thanks.

[neojamin]

HI, its a thinkpad edge 13"...Id on't really know how to find more info in ubuntu, I just runned Sysinfo and got some info:
Intel(R) Core(TM) i3 CPU U 380 @ 1.33GHz
SOundcard:Intel corporation 5 series/3400 series Chipset High Definition Audio (rev06)
Subsystem:lenovo Device 21 c8

need anything else? thanks

[Jon Monreal]

Try opening a terminal and typing: sudo gedit /etc/modprobe.conf/alsa-base.conf

Add (copy and paste) the following on a new line at the end: options snd-hda-intel model="olpc-xo-1_5"

Then, save and restart, and test the headphone jack.

[neojamin]

I put the first line and a blank document opens...is it meant to be blank?

[Jon Monreal]

That's fine.

[neojamin]

I can't save the file, it says: Could not find the file /etc/modprobe.conf/alsa-base.conf.
Please check that you typed the location correctly and try again.

[Jon Monreal]

Sorry I'm facepalming right now.

It should be: sudo gedit /etc/modprobe.d/alsa-base.conf