2012/3/17, Adam Williamson awilliam@redhat.com:
On Sat, 2012-03-17 at 10:04 +0800, Raymond Yau wrote:
2012/3/17, Adam Williamson awilliam@redhat.com:
Welp, pretty much as the topic says.
I just noticed today that sound is no longer playing from the internal speakers of my laptop, a 2010 model Sony Vaio Z. Plugging in headphones causes sound to be played fine through those. There are three possible choices for 'Connector' - 'Analog Speakers', 'Analog Output', and 'Analog Headphones' - but none of these seems to make sound come out of the internal speakers. The default is 'Analog Speakers', and when it's set to this, headphone output does work when headphones are plugged in.
I've verified that it's broken on Fedora 16 kernels 3.2.6-4, 3.2.8-3 and 3.2.10-1. It's also broken in a very recent Fedora 17 kernel, 3.3.0rc6 or so. It works on a Fedora 16 live image, with kernel 3.1.0-1. Unfortunately the kernels before 3.2.6 have been trashed from Fedora's buildsystem archives, I think, so it's hard to narrow things down any further :/
the alsa-info output is http://www.alsa-project.org/db/?f=368e2359757b537d4daa0f5399830d3942540196 .
it is a bug if sound preference allow user to select speaker when auto-mute mode is enabled (the speaker is automatically muted by the driver when you plug the headphone)
Then I guess that's another bug :) Because yes, the laptop does auto-mute by default. When the speakers are actually working, if I plug in headphones, the speakers get muted and the headphones work. No need to manually select an output.
http://www.intel.com/support/motherboards/desktop/sb/cs-020642.htm#multistre...
AFAIK, multistreaming is not yet implemented for desktop using realtek codecs
The ALC889 provides ten DAC channels that simultaneously support 7.1 sound playback, plus 2 channels of independent stereo sound output (multiple streaming) through the front panel stereo outputs.