which channel map should be used for your laptop subwoofer
a) { .channels = 4, .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE, SNDRV_CHMAP_LFE } }, { }
b)
{ .channels = 4, .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_LFE, SNDRV_CHMAP_NA } },
c)
{ .channels = 4, .map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR, SNDRV_CHMAP_NA, SNDRV_CHMAP_LFE } },
which channel map should be used for your laptop subwoofer
a) CHMAP_LFE, SNDRV_CHMAP_LFE } },
{ .channels = 4,
.map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
SNDRV_
{ }
b)
{ .channels = 4, CHMAP_LFE, SNDRV_CHMAP_NA } },
.map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
SNDRV_
c)
{ .channels = 4, CHMAP_NA, SNDRV_CHMAP_LFE } },
.map = { SNDRV_CHMAP_FL, SNDRV_CHMAP_FR,
SNDRV_