Public bug reported:
(Summarized by Claude)
Hardware: Acer Predator Helios 18 AI (PH18-73)
Kernel: 7.0.0-22-generic (Ubuntu 26.04 "Resolute")
Audio codec: Realtek ALC245 + 2x Cirrus Logic CS35L41 (I2C)
PCI SSID: 1025:182c
Problem:
The subwoofer/LFE channel cannot be volume-controlled and runs at
constant 100% output. The front speakers are only audible from ~35%
master volume upward.
Root cause:
Upstream commit d64cbb5ed9227566c068ac9300a85912234d10aa
("ALSA: hda/realtek: Add support for Acer Helios Laptops using CS35L41 HDA")
adds the following quirk entry:
SND_PCI_QUIRK(0x1025, 0x182c, "Acer Helios ZPD",
ALC287_FIXUP_PREDATOR_SPK_CS35L41_I2C_2)
The fixup code ALC287_FIXUP_PREDATOR_SPK_CS35L41_I2C_2 is present in
the compiled module (verified via strings on snd-hda-codec-alc269.ko),
but the device table entry for SSID 1025:182c is missing.
Evidence:
$ sudo dmesg | grep "fixup\|1025:182c"
snd_hda_codec_alc269 ehdaudio0D0: ALC245: picked fixup for PCI SSID 1025:182c
(no PREDATOR_SUBWOOFER fixup applied)
$ strings /tmp/alc269.ko | grep -i "predator\|182c"
ALC287_FIXUP_PREDATOR_SPK_CS35L41_I2C_2 ← code present
(no "Acer Helios ZPD" or "182c" string found) ← table entry missing
Fix:
Apply upstream commit d64cbb5ed9227566c068ac9300a85912234d10aa
to linux-7.0 package, specifically the SND_PCI_QUIRK entry for
0x1025, 0x182c.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: audio regression
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https://bugs.launchpad.net/bugs/2156446
Title:
ALSA: hda/realtek: Missing quirk for Acer Predator PH18-73 (SSID
1025:182c) - ALC287_FIXUP_PREDATOR_SPK_CS35L41_I2C_2
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