ALSA: hda/realtek: Add quirk for LG gram 16 (16Z90TR)

The LG gram 16 (16Z90TR, SSID 1854:0554) drives its internal speakers
through Samsung-style smart amplifiers on an ALC298. Nothing initialises
them, so the internal speakers are silent after a cold boot, while
headphones, HDMI and the microphones work.

A warm reset leaves the amps initialised, which masks the problem:
rebooting gives working speakers, a cold boot does not, with a
bit-identical kernel log in both cases. Dumping the codec's processing
coefficients in the two states shows the difference confined to COEF
0x22/0x23/0x25/0x26. COEF 0x22, the amp select register written by
alc298_samsung_v2_init_amps(), reads 0x39 when the speakers work and
0x00 after a cold boot. 0x39 is the second entry of
alc298_samsung_v2_amp_desc_tbl[], so two amps are in use.

Verified with hda_model=alc298-samsung-amp-v2-2-amps, which selects the
same fixup: the internal speakers work from a cold boot and COEF 0x22
reads 0x39.

Signed-off-by: Aaron Fan <aaronfan404@gmail.com>
Link: https://patch.msgid.link/20260802055818.7389-1-aaronfan404@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

0 files changed, 0 insertions, 0 deletions