ACK: [SRU][R][PATCH 0/1] Fix noise of audio output on Dell Pro QCM1255 after reboot

[Hui Wang]

Acked-by: Hui Wang <hui.wang at canonical.com>

On 7/15/26 10:53, Chris Chiu via kernel-team wrote:
> BugLink: https://bugs.launchpad.net/bugs/2160666
>
> [Impact]
> Dell Pro QCM1255 and Dell Pro Micro QCM1255 systems have headphone pop noise when using Pipewire audio server on Ubuntu 24.04. The noise appears when headphones are plugged in. The issue does not occur with Pulseaudio.
>
> [Fix]
> Add a quirk for Dell Pro QCM1255 (PCI ID 0x1028, 0x0e6b) and Dell Pro Micro QCM1255 (PCI ID 0x1028, 0x0e6d) to route headphone output to DAC 0x2, which eliminates the popping sound. The fix uses the existing alc285_fixup_invalidate_dacs function.
>
> Upstream commit: 97272a5704bf in tiwai/sound tree, targeting v7.2-rc2.
> Link: https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git/commit/?id=97272a5704bf13369bba43951ad9fe8f806ccc7f
>
> [Test Plan]
> 1. Boot Dell Pro QCM1255 or Dell Pro Micro QCM1255 with Ubuntu 24.04 and Pipewire audio server
> 2. Plug in headphones
> 3. Without patch: popping/crackling noise heard through headphones
> 4. With patch: no popping noise, clean audio output
>
> [Where problems could occur]
> Only take effect on particular SSIDs. The risk of regression should be low
>
> Kailang Yang (1):
>    ALSA: hda/realtek - Fixed Headphone noise issue for Dell QCM1255
>
>   sound/hda/codecs/realtek/alc269.c | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
>