* qcom-lpass: RX HPH Mode is set to a ULP mode which causes distortion
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@ 2025-07-17 2:54 ` GitHub issues - opened
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From: GitHub issues - opened @ 2025-07-17 2:54 UTC (permalink / raw)
To: alsa-devel
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
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2025-07-17 2:54 ` qcom-lpass: RX HPH Mode is set to a ULP mode which causes distortion GitHub issues - opened
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