Bug#1135354: linux-image-7.0.3+deb14-amd64: Conexant SN6140: UCM returns EBUSY at cold boot, audio falls back to dummy output

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From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1135354: linux-image-7.0.3+deb14-amd64: Conexant SN6140: UCM returns EBUSY at cold boot, audio falls back to dummy output
Date	Sat, 09 May 2026 21:30:01 +0200
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Hi,

On Fri, May 01, 2026 at 10:27:26PM +0800, Yu Rui wrote:
> Package: src:linux
> Version: 7.0.3-1
> Severity: normal
> Tags: upstream
> X-Debbugs-Cc: debian-amd64@lists.debian.org
> User: debian-amd64@lists.debian.org
> Usertags: amd64
> 
> Dear Maintainer,
> 
> After cold boot, the Conexant SN6140 audio codec on this AMD platform
> fails to initialize correctly when PipeWire/WirePlumber probes it via
> ALSA UCM. The speaker and headphone output are unavailable, and the
> system falls back to dummy output.
> 
> Hardware:
>   Laptop: HONOR BRN-HXXB
>   HDA Controller: AMD Ryzen HD Audio [1022:15e3]
>   Codec: Conexant SN6140 (Vendor ID 0x14f11f87, Subsystem 0x1ee7204b)
> 
> The PipeWire log shows:
>   spa.alsa: '_ucm0001.hw:Generic_1':
>     playback open failed: Device or resource busy
> 
> WirePlumber then fails to create the speaker sink:
>   s-monitors: Failed to create
>   alsa_output.pci-0000_c1_00.6.HiFi__Speaker__sink:
>   Object activation aborted: PipeWire proxy destroyed
> 
> Restarting WirePlumber after the system has been up for a few seconds
> (systemctl --user restart wireplumber) consistently fixes the issue.
> This confirms the codec simply needs more time to initialize than the
> driver currently allows.
> 
> Setting snd_hda_intel.power_save=0 does not resolve the issue.
> A 4-second delay before WirePlumber startup works around it.
> 
> Root cause appears to be in the kernel HDA driver: the Conexant SN6140
> codec takes longer to complete initialization than snd_hda_intel
> expects, but the driver reports the card to userspace (udev event)
> before the codec is fully ready.

Thanks for your report! I think we should have alredy enough
information here to forward it upstream. But before doing so, can you
please test as well the most recent version (7.0.4-1) to see if you
still can reproduce.

Regards,
Salvatore

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Bug#1135354: linux-image-7.0.3+deb14-amd64: Conexant SN6140: UCM returns EBUSY at cold boot, audio falls back to dummy output Yu Rui <yardrat0117@gmail.com> - 2026-05-01 16:30 +0200
  Processed: Re: Bug#1135354: linux-image-7.0.3+deb14-amd64:  Conexant SN6140: UCM returns EBUSY at cold boot, audio falls back to dummy  output "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-09 21:30 +0200
  Bug#1135354: linux-image-7.0.3+deb14-amd64: Conexant SN6140: UCM returns EBUSY at cold boot, audio falls back to dummy output Salvatore Bonaccorso <carnil@debian.org> - 2026-05-09 21:30 +0200
  Processed: Reply to Bug#1135354: fixed in 7.0.4+deb14-amd64 "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-05-12 14:40 +0200

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