[ALSA] [snd-intel-hda] enable center/LFE speaker on some laptops
This patch adds LFE mixer controls for laptops with a stac9200 and a mono speaker pin with amplifier. Signed-off-by: NRichard Fish <bigfish@asmallpond.org> Signed-off-by: NTakashi Iwai <tiwai@suse.de> Signed-off-by: NJaroslav Kysela <perex@suse.cz>
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