Heads up: powerdown changes to alsa-base in Lucid/10.04

Daniel Chen seven.steps at gmail.com
Thu Dec 31 00:36:45 GMT 2009

Hi, folks,

[a more complete version of my announcement in #ubuntu-devel on Freenode]

Based on the abysmal feedback that we received for Karmic/9.10
regarding powering down HDA controllers after ten idle seconds[0],
I've reverted the change in the most recent upload of alsa-driver to Lucid/10.04 and, in doing so, restored the behavior
shipped in Jaunty/9.04. So, at the cost of less efficient battery use
[for unplugged laptops] one will no longer hear the annoying crackling
and popping associated with these HDA controllers.

This change was also driven by the fact that Lucid's shipped kernel is
highly unlikely to have the necessary patches backported. The good
news, OTOH, is that over the past month my fixes for these symptoms
(including the infrastructure) have landed in alsa-driver and
will be available in crack-of-the-day alsa-driver snapshot builds soon
and/or via linux-backports-modules-alsa-lucid-generic. Additionally,
there is ongoing work to power down additional nodes for the HDA
codecs; please find me on IRC (or leave a note via memoserv) if you
wish to help roll out these fixes for your particular hardware. Please
have your /proc/asound/card*/codec* handy/pastebinned.


[0] https://lists.ubuntu.com/archives/ubuntu-devel-discuss/2009-May/008239.html

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