Ubuntu
linux-source-2.6.17 package

Master channel on C-Media Electronics CMI9780

Bug #71493 reported by finalbeta
12
Affects Status Importance Assigned to Milestone
linux (Ubuntu)
Won't Fix
Undecided
Unassigned
linux-source-2.6.17 (Ubuntu)
Invalid
Undecided
Unassigned

Bug Description

Binary package hint: kernel-image-2.6.17-10-generic-di

Card: Intel ICH5
Chip: C-Media Electronics CMI9780
kernel: Every version that supports this card I guess, Dapper, Edgy, Feisty all have the problem.

Problems:
The master channel controls nothing. Muting it, changing volume has no effect on anything.

Stereo sound:
When only playing in stereo, this problem can be solved by just using PCM to change/mute volume.

Surround sound:
When playing in 2.1/5.1 configurations, this is a bigger problem. To change sound, one has to individually change multiple channels. In 5.1 I would have to mute PCM, Center, LFE and toggle surround to turn of all sounds.

Work arround:
For 5.1 I currently use xbindkeys with the following scripts. But the are bound to fail every now and then.

mute/unmute sound: "amixer sset PCM toggle && amixer sset Center toggle && amixer sset LFE toggle && amixer sset Surround toggle"
Turn sound up: "amixer sset PCM 10+ unmute && amixer sset LFE 1.99+ unmute"
Turn sound down: "amixer sset PCM 10- unmute && amixer sset LFE 1.99- unmute"

But because of the nature of amixer, the channels will not always have the same volume. Perhaps a better script can be written. But really the Master channel should just be fixed.

Revision history for this message
finalbeta (j-greenhouse) wrote :

Added a bash script that allows control of the sound without problems.
I can't code a patch, but it's a workable workaround... for now.

Revision history for this message
finalbeta (j-greenhouse) wrote :

The .asoundrc I attached uses softvol to create a master channel. (Normally one can not overwrite the master, but in this case it does work since master controls nothing)
It also upmixes to 5.1.

The problems lie with the driver, and will not get fixed judging from what upstream has to say about it.

This solution works, but can't be incorporated into a default Ubuntu in any normal fashion.

Revision history for this message
finalbeta (j-greenhouse) wrote :

The .asoundrc I attached uses softvol to create a master channel. (Normally one can not overwrite the master, but in this case it does work since master controls nothing)
It also upmixes to 5.1.

The problems lie with the driver, and will not get fixed judging from what upstream has to say about it.

This solution works, but can't be incorporated into a default Ubuntu in any normal fashion.

Revision history for this message
Matthew Woerly (nattgew) wrote :

Can you confirm that this bug is still present in the latest kernel of Hardy?

Revision history for this message
Sergio Zanchetta (primes2h) wrote :

The 18 month support period for Edgy Eft 6.10 has reached it's end of life. As a result, we are closing the linux-source-2.6.17 Edgy Eft kernel task.

Changed in linux-source-2.6.17:
status: New → Invalid
Revision history for this message
Sergio Zanchetta (primes2h) wrote :

Hardy Heron 8.04 was recently released. It would be helpful if you could test the new release and verify if this is still an issue - http://www.ubuntu.com/getubuntu/download . You should be able to test your bug using the LiveCD. Please let us know your results. Thanks.

Changed in linux:
status: New → Incomplete
Revision history for this message
rdsard (sardjardi) wrote :

Yep! It is confirmed that the bug hasn't been fixed in Ubuntu 8.04 Hardy Heron.

Revision history for this message
Leann Ogasawara (leannogasawara) wrote :

The Ubuntu Kernel Team is planning to move to the 2.6.27 kernel for the upcoming Intrepid Ibex 8.10 release. As a result, the kernel team would appreciate it if you could please test this newer 2.6.27 Ubuntu kernel. There are one of two ways you should be able to test:

1) If you are comfortable installing packages on your own, the linux-image-2.6.27-* package is currently available for you to install and test.

--or--

2) The upcoming Alpha5 for Intrepid Ibex 8.10 will contain this newer 2.6.27 Ubuntu kernel. Alpha5 is set to be released Thursday Sept 4. Please watch http://www.ubuntu.com/testing for Alpha5 to be announced. You should then be able to test via a LiveCD.

Please let us know immediately if this newer 2.6.27 kernel resolves the bug reported here or if the issue remains. More importantly, please open a new bug report for each new bug/regression introduced by the 2.6.27 kernel and tag the bug report with 'linux-2.6.27'. Also, please specifically note if the issue does or does not appear in the 2.6.26 kernel. Thanks again, we really appreicate your help and feedback.

Revision history for this message
Markus Korn (thekorn) wrote :

Unfortunately this bug report is being closed because we received no response to the last inquiry for information. However, the Intrepid Ibex 8.10 Beta release was most recently announced - http://www.ubuntu.com/testing/intrepid/beta . If you are able to confirm this is still an issue with this most recent release please feel free to reopen this report. To reopen the bug report you can click on the current status, under the Status column, and change the Status back to "New".

Thanks,
Markus

Changed in linux:
status: Incomplete → Won't Fix
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