ALSA: hda/realtek: Fix ALC700 audio on Intel Hades Canyon

On Intel Hades Canyon systems with an ALC700 codec, analog audio can
become unusable after rebooting from Windows into Linux.

The affected system uses codec subsystem ID 8086:2073. In the broken
state, Realtek coefficient 0x1b has value 0x4a4b. Setting bit 0x0400
changes it to 0x4e4b and immediately restores normal analog playback.

The BIOS also sets this bit after disabling and re-enabling onboard
audio, while Windows may leave it cleared. Linux currently does not
restore it during codec initialization.

Add a machine-specific fixup for Intel Hades Canyon which sets only
bit 0x0400 of coefficient 0x1b during HDA_FIXUP_ACT_INIT.

The fix has been verified across Windows -> Linux reboots on an Intel
NUC8i7HNB with an ALC700 codec.

Signed-off-by: Csaba Budai <ilyr73@gmail.com>
Link: https://patch.msgid.link/20260821102514.11194-1-ilyr73@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

0 files changed, 0 insertions, 0 deletions