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VIA On-board AC'97 Audio: Fix PCI registers, implement PCI Power Manager capability registers, properly separate the modem SGD from the audio SGD, and fix 5-bit volume attenuation, this also fixes audio playback in NT 4.0.

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OBattler
2025-03-31 04:35:17 +02:00
parent 512154e4a8
commit 3f0138a58c
3 changed files with 233 additions and 145 deletions
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5
src/sound/snd_ac97_codec.c
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@@ -539,8 +539,9 @@ ac97_codec_getattn(void *priv, uint8_t reg, int *l, int *r)
*l = codec_attn[0x3f - (l_val & 0x3f)];
*r = codec_attn[0x3f - (r_val & 0x3f)];
} else { /* 5-bit gain */
*l = codec_attn[0x47 - (l_val & 0x1f)];
*r = codec_attn[0x47 - (r_val & 0x1f)];
/* Yes, 0x3f is correct, the 0x47 was most likely a decimal-hex mix-up. */
*l = codec_attn[0x3f - (l_val & 0x1f)];
*r = codec_attn[0x3f - (r_val & 0x1f)];
}
/* Apply per-channel mute and center/LFE powerdowns where applicable. */