From: GitHub issues - opened <github@alsa-project.org>
To: alsa-devel@alsa-project.org
Subject: qcom-lpass: RX HPH Mode is set to a ULP mode which causes distortion
Date: Thu, 17 Jul 2025 04:54:47 +0200 (CEST) [thread overview]
Message-ID: <1852ea5b3e986500-webhooks-bot@alsa-project.org> (raw)
In-Reply-To: <1852ea5b3e41fa00-webhooks-bot@alsa-project.org>
alsa-project/alsa-ucm-conf issue #595 was opened from valpackett:
The headphone enable sequence for all Qualcomm devices sets `CLS_H_ULP` mode:
https://github.com/alsa-project/alsa-ucm-conf/blob/1b69ade9b6d7ee37a87c08b12d7955d0b68fa69d/ucm2/codecs/qcom-lpass/rx-macro/HeadphoneEnableSeq.conf#L1-L3
I was trying to figure out why I was getting horrendous distortion on the headphone jack of my Dell Latitude 7455 laptop above a certain relatively-quiet volume level. After lots of fiddling and searching (thanks, [XDA forum audio modders](https://xdaforums.com/t/mod-audio-biquads-utilizing-qualcomms-audio-codec-for-headphone-compensation.3093000/post-72175274) from several years ago!) I figured it out. Changing that to `CLS_AB_HIFI` has completely fixed the distortion!
Should the default be changed to a HIFI mode for everyone, i.e. right in that file?
ping: @Srinivas-Kandagatla
Issue URL : https://github.com/alsa-project/alsa-ucm-conf/issues/595
Repository URL: https://github.com/alsa-project/alsa-ucm-conf
parent reply other threads:[~2025-07-17 2:55 UTC|newest]
Thread overview: expand[flat|nested] mbox.gz Atom feed
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