[alsa-devel] Recent code changes for HD-audio on HG repo

Takashi Iwai tiwai at suse.de
Fri Aug 10 17:53:39 CEST 2007


right now I committed a series of patches for HD-audio driver to HG
repository.  There are two big changes:

- The suspend/resume code is rewritten

  Now the driver uses cached register values to restore the last
status.  It's much cleaner than the previous code, and should work
better.  But, I couldn't test it on all existing laptops.
So, please test and report any positive/negative feedbacks.

- New POWER_SAVE kconfig

  The driver has POWER_SAVE confiugration.  When enabled (it's so if
you build from alsa-driver tree), the driver turns off the codec and
the controller chips when not used, and turn on again dynamically on
demand.  Good for laptops, good for mother earth! :)

The feature can be enabled/diabled even on the fly via "power_save"
module option of snd-hda-intel.  For disabling it, write 0 to
/sys/modules/snd_hda_intel/parameters/power_save for disabling it,
or pass power_save=0 in modprobe option (or its configuration).

Again, please give any positive/negative feedbacks, as I couldn't test
many devices.



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