At Sun, 12 May 2013 11:53:41 +0200, Alex Riesen wrote:
Hi,
I just noticed (use the headphones rarely) that the headphones on this System76 Lemur Ultra (lemu4) stopped working. There is absolutely no output.
I tried reverting all changes to patch_via.c since v3.8, and have the sound back, but there wasn't much to revert:
Revert "ALSA: hda - Rearrange INPUT_PIN_ATTR_*" Revert "ALSA: hda - Use generic parser for VIA codec driver" Revert "ALSA: hda - Enable parsing the independent HP mode as default for VIA codecs" Revert "ALSA: hda/via - Fix wrong checks of power state bits" Revert "ALSA: hda - Fix phantom jacks on VT1708" Revert "ALSA: hda - detect jacks on VT1708 even when no streams are active" Revert "ALSA: hda - Use generic array for loopback list management"
and one change (which I indeed suspect) is large: the use of generic parser.
The problem is also present in 3.10-rc1. The output of alsa-info.sh attached, for 3.8.12 and 3.9.2 respectively.
It's strange that the pin 0x25 shows EAPD 0x00 and pin-control 0x00. They should be 0x02 and 0xc0 constantly. Is it taken at the moment the headphone is plugged, right? Please give alsa-info.sh outputs at both the headphone plugged and unplugged.
Could you check whether changing them makes the headphone output working? For example, get hda-verb program (see Documentation/sound/alsa/HD-Audio.txt) and run it like
hda-verb /dev/snd/hwC0D0 0x25 SET_PIN_WID 0xc0 hda-verb /dev/snd/hwC0D0 0x25 SET_EAPD 0x02
thanks,
Takashi