AD1981HD

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AD1981HD

This is a Analog Devices High-Definition Audio 1.0 controller

Features

  • Chipset: AD1981HD
  • Interface: HD Audio 1.0

Linux OSS driver

??

Linux ALSA driver

This chip works with snd-hda-intel driver. Possible cracking noises can be avoided by adding the position_fix=2 optional argument for the module.

  • The AD1981HD installs by default in Debian. To get it to work you must first install it with alsaconf.
  • As of kernel 2.6.17, some users report a missing master volume control (e.g., with the T60p), as described in this thread: http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg17089.html The "Front" channel, which controls the external speakers, can act as a master, but must be unmuted for headphones to work. However, with the "Front" volume all the way down, the headphones will be very quiet, and audible sound may still emerge from the speakers.


NOTE!
The modem and audio chip are very closely connected somehow. According to a bug in the BIOS, the modem disables the audio device, too. That seems to be the reason for most sound problem with this chip.

Oddly enough, in Fedora Core 5 on an x60s, the recording function seems to work fine (if you select the "Front Mic" as the capture device in alsamixer) in both Audacity and skype, while not working in ALSA's own arecord! Users are advised to try audacity before concluding that recording is not functioning correctly.

ThinkPads this chip may be found in

Datasheets