https://www.thinkwiki.org/w/api.php?action=feedcontributions&feedformat=atom&user=Ap 2026-05-14T19:41:56Z User contributions MediaWiki 1.31.12 https://www.thinkwiki.org/w/index.php?title=Problem_with_audio_clipping&diff=32575 2007-08-27T08:13:52Z

<p>Ap: </p> <hr /> <div>One some models, certain audio mixer settings may result in very &quot;harsh&quot; and distorted sound both on the internal speakers and on headphones plug. This is especially evident when the played audio has high volume (i.e., full dynamic range). <br /> <br /> This is caused by a hardware flaw: excessive internal amplification saturates the audio channels, resulting in [http://en.wikipedia.org/wiki/Clipping_(audio) clipping].<br /> <br /> Solution: reduce the volume on the responsible mixer channel(s).<br /> e.g. in the console ''alsamixer'' with control via arrows: up/down left/right.<br /> <br /> ===Model-specific observations===<br /> * ThinkPad {{T43}} ([[AD1981B]] audio controller): PCM channel volume higher than 70% may result in clipping, regardless of the Master channel.<br /> * ThinkPad {{R40}} (Intel 82801DB/DBL/DBM audio controller (AC97)): PCM volume needs to be set under 80%, higher values cause clipping. Same with the Master channel as on T43.<br /> * ThinkPad {{R51e}} ([[AD1981B]] audio controller): PCM channel volume higher than 84% may result in clipping, regardless of the Master channel.<br /> * ThinkPad {{Z61e}} (Intel High Definition with AD1981): Just turn down the PCM channel volume to at least 77% and you should be happy (in some combination with external speakers, 65% was needed), the Master Channel can be kept at 100%. If that doesn't help, loading snd-hda-intel with model=thinkpad and position_fix=1 might also improve a bit.</div>

Ap