No headphone sound; iMac 21.5", 12,1; patch_cirrus.c; imac27_122

[benzodiaz]

Hi,

The title says most of the issue, but the critical issue is that I don't know why I can't find patch_cirrus.c. I was trying to solve the problem with Lunarts and friends, but what worked for them didn't work for me; i.e., adding the line:
options snd-hda-intel model=imac27_122,
to /etc/modprobe.p/alsa-base.conf, then, restarting the computer.

Does Lubuntu not have the file patch_cirrus.c?
How does it build the list of alsa options?

Please let me know if you need additional information.

Thanks,
-J

[gordintoronto]

It took me 30 seconds to find this patch by using Google:
http://tomoyo.sourceforge.jp/cgi-bin...patch_cirrus.c

It never hurts to mention what operating system you are using. Apparently Lubuntu, but what version?

[benzodiaz]

I'm using Lubuntu 12.04, Mac 64 bit.

Re: Ubuntu 12.04 on imac 2011, no headphone sound,

that issue was solved. However, the solution doesn't work for my system and the only difference is that I am using Lubuntu, while Lunarts is using Ubuntu. The solution was as follows:

There is no need to apply the patch above, because it is already there on your ubuntu, my procedure:

1 - By logic recognized which the lines in green mean the extra fix lines of the patch

2 - using gksudo nautilus, then nautilus search feature, located the patch_cirrus.c and entered there with full write privileges(due to gksudo)

3 - using gedit search feature discovered which one of the patch green lines was already there.

After some additional thinking I noticed which one of the patch lines is close to other lines whose content are exactly used on /etc/modprobe.d/alsa-base.conf to solve such kind of problems. The alsa list of supported models for the cirrus codec is not updated yet to include that(not sure if it will); no matter if you get the list from your own ubuntu or from the internet. There was no way to know this model existed without benzodiaz help.

So, open your terminal and:

1 - sudo gedit /etc/modprobe.d/alsa-base.conf

2 - add to end of the file "options snd-hda-intel model=imac27_122"(only the stuff inside the quotes), save and reboot.

This worked for me, the only fix from several and several others I tried. What a pleasant surprise, the fix was already there since this year january, it was only hidden.

PS: Thanks a lot for the tip benzodias

Re: the fact that the file patch_cirrus.c has already been applied in the 3.2.0-25-generic kernel for Ubuntu, says that we can add the mac27_122 option and we have a solution.

My filesystem doesn't contain the file patch_cirrus.c, which seems to build the alsa driver database in some way...

Let me know what you think.

[gordintoronto]

Ubuntu does not include kernel source code, so there is no reason you would have that C program on your system.

If I were you, I would Google other things to try in "model=imac...." unless you are sure your imac is a "27_122" I would certainly try the simple case: model=imac

To further identify your hardware, open Terminal and run this command:
sudo lshw -html > Desktop/config.htm

This should place a file on your desktop; double-click on it to open it in your browser. Search for "Audio device" and "product" might give you something new to plug into Google.

[benzodiaz]

I have a solution that works good enough for me. This is what I did:

1. In a terminal, paste the line in the quotations, "sudo wget -O run.py http://www.alsa-project.org/hda-analyzer.py"

2. Then paste this, "sudo python run.py", and it will open what's called HDA Analyzer.

3. Click codec-0 on the left hand side, under Nodes. Where it says GPIO, uncheck out-dir, enable, and data for the row [1], and check them for row [2]. If you had your headphones on when you checked data [2], you should get output.

4. At the bottom, click Exp., save as, and save it in your home directory.

5. Open gedit and type, "gksu python /path/to/previously/saved/file" and save it in your home directory. Go to the gedit file you just made, right click and go to properties, click the permissions tab, and check make this file executable.

7. Whenever your headphones don't work and they should, open a terminal, Ctrl+Alt+t, and type the name of the gedit file you created. This reloads the settings you made in hda analyzer.

Thanks for everybody's help!
Cheers,
benzo

[renws]

That worked for me, thanks a lot.

I'm wondering how you found the solution.

I have a solution that works good enough for me. This is what I did:

1. In a terminal, paste the line in the quotations, "sudo wget -O run.py http://www.alsa-project.org/hda-analyzer.py"

2. Then paste this, "sudo python run.py", and it will open what's called HDA Analyzer.

3. Click codec-0 on the left hand side, under Nodes. Where it says GPIO, uncheck out-dir, enable, and data for the row [1], and check them for row [2]. If you had your headphones on when you checked data [2], you should get output.

4. At the bottom, click Exp., save as, and save it in your home directory.

5. Open gedit and type, "gksu python /path/to/previously/saved/file" and save it in your home directory. Go to the gedit file you just made, right click and go to properties, click the permissions tab, and check make this file executable.

7. Whenever your headphones don't work and they should, open a terminal, Ctrl+Alt+t, and type the name of the gedit file you created. This reloads the settings you made in hda analyzer.

Thanks for everybody's help!
Cheers,
benzo