At Wed, 1 Jul 2009 20:04:36 +0200 (CEST), ruben@ugr.es wrote:

Hi all

I managed to get sound working on my acer 6935, which has an ALC889 driven by the intel_hda driver The lack of sound seems to appear in other laptops as well.

The bug report is at https://bugtrack.alsa-project.org/alsa-bug/view.php?id=4261

I know Takashi Iwai is familiar with the problems, since I used his workaround with hda-verb to get it working initially, so if he is free and wants to get this fixed, I'd be grateful (if anybody else can have a look, that'd be great as well).

The patch is very easy (you can download it at the url above). I added snd_hda_codec_write(codec, 0x15, 0, AC_VERB_SET_EAPD_BTLENABLE, 2); at the end of patch_alc883 before the return.

Please check whether there is a problem with other models; in that case a new patch_alc889 which calls patch_alc883 plus the line can be added, or more detailed checks on the pci ids can be done.

Does this happen even with the latest alsa-driver snapshot? ftp://ftp.kernel.org/pub/linux/kernel/people/tiwai/snapshot/alsa-driver-snapshot.tar.gz

Takashi