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* [REPORT] ALSA: hda/realtek: Fix silent/extremely quiet audio on HP Pavilion x360 (ALC295) with uninitialized SSID 103c:0000
@ 2026-03-01  5:57 Ngon
  2026-03-03  9:38 ` Takashi Iwai
  0 siblings, 1 reply; 4+ messages in thread
From: Ngon @ 2026-03-01  5:57 UTC (permalink / raw)
  To: tiwai, alsa-devel

Hi Takashi and ALSA developers,


  I would like to report a hardware quirk and a verified fix for the HP
Pavilion x360 Convertible 14-cd0xxx (Codec:
  Realtek ALC295).


  Problem:
  The BIOS on this model reports a generic/uninitialized Subsystem ID:
103c:0000. Because of this, the kernel fails to
  apply the necessary HP-specific quirks. The audio output is either
completely silent or extremely quiet, even when all
  mixers are at 100%. This issue is particularly severe on machines where
the original screen has been removed/modified,
  which seems to trigger a "protection mode" in the hardware amplifier.


  Hardware Details:
   - Model: HP Pavilion x360 Convertible 14-cd0xxx
   - Codec: Realtek ALC295
   - Reported Subsystem ID: 103c:0000


  The Fix:
  I found that manually forcing the amplifier gain and processing
coefficients using hda-verb restores the audio to
  normal volume levels. The following verbs are required:


   1. hda-verb /dev/snd/hwC0D0 0x20 SET_COEF_INDEX 0x07 followed by
SET_PROC_COEF 0x7770 (Forces Amplifier Gain)
   2. hda-verb /dev/snd/hwC0D0 0x20 SET_COEF_INDEX 0x0d followed by
SET_PROC_COEF 0x3000 (Sets Processing State)


  Proposed Solution:
  Could these verbs be integrated as a default quirk for ALC295 when the
Subsystem ID 103c:0000 is detected on HP
  hardware? Or perhaps added to the ALC269_FIXUP_HP_GPIO_LED chain?


  I have verified this fix on Pop!_OS 22.04 (Kernel 6.17) and it
consistently solves the issue.

  Best regards,
kemzsitink

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2026-03-05 15:05 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2026-03-01  5:57 [REPORT] ALSA: hda/realtek: Fix silent/extremely quiet audio on HP Pavilion x360 (ALC295) with uninitialized SSID 103c:0000 Ngon
2026-03-03  9:38 ` Takashi Iwai
2026-03-04  5:33   ` Ngon
2026-03-05 15:04     ` Takashi Iwai

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