https://www.thinkwiki.org/w/api.php?action=feedcontributions&feedformat=atom&user=IneQuationThinkWiki - User contributions [en]2026-05-09T06:26:58ZUser contributionsMediaWiki 1.31.12https://www.thinkwiki.org/w/index.php?title=AD1981B&diff=50417AD1981B2011-02-04T17:50:23Z<p>IneQuation: Added a mention about the hardware volume controls, tore quite a few hairs off my head before I figured it out and want to spare others the stress.</p>
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=== AD1981B ===<br />
This is a Analog Devices AC'97 Audio codec<br />
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Note: The documentation of the R40 incorrectly(?) states it has a AD1891A<br />
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=== Features ===<br />
* Chipset: AD1981B<br />
* Interface: AC'97<br />
* PCI-ID: 8086:24c5 (part of: [[Intel_82801DBM|Intel 82801DB-ICH4]])<br />
* PCI-ID: 8086:266e (part of: [[Intel_82801FBM|Intel 82801FB-ICH6]])<br />
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=== Linux ALSA driver ===<br />
On systems where lspci shows an Intel AC'97 Audio Controller, this chip is supported by the '''snd-intel8x0''' kernel module. This driver provides enhanced [[How to enable audio codec power saving|power saving]] capabilities.<br />
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On systems where lspci shows an ATI AC'97 Audio Controller (R40e and R51e), this chip is supported by the '''snd-atiixp''' kernel module.<br />
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==== Note ====<br />
If sound still doesn't work even if you have a perfectly correct setup, try turning the hardware volume up with the keyboard buttons. They are totally independent from the ALSA controls and chances are they are just muted.<br />
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==== Note ====<br />
On some models ({{T40}}, {{T43p}}, ... {{R51e}} ...) audio is muted if either Headphone or Line Jack are unmuted. See also ALSA Wiki FAQ [http://alsa.opensrc.org/FAQ004]. Also, if Headphone Sense or Line Jack Sense are unmuted audio is dead ({{R52}}, {{X40}}). By default the Sense settings are not shown in GNOME.<br />
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==== Note ====<br />
By default microphone capture is disabled when using the ALSA drivers (this may or may not be true with the OSS drivers). To enable microphone capture, use amixer or gnome-alsamixer to enable capture on the microphone and Capture devices, i.e., 'amixer set 'Mic' cap; amixer sset 'Capture' cap'.<br />
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==== Note ====<br />
A bug was introduced in the 2.6.20 kernel (between the rc1 and rc2 releases) which causes the sound to stop working after hibernation. Rebooting does not seem to fix the problem. A quick work-around is to do a suspend-to-ram, and then wake the machine up. This issue is chronicled in this bug report on Launchpad.net:<br />
The fix changing HIBERNATE_MODE=shutdown to HIBERNATE_MODE=platform in /etc/default/acpi-support worked very well. I don't know if it possibly could introduce other bugs or if it's a true fix.<br />
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https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.20/+bug/80893<br />
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Changing HIBERNATE_MODE=shutdown to HIBERNATE_MODE=platform in /etc/default/acpi-support seems to be solving this issue for many users. Confirmed to work with: X31, T43p<br />
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=== FreeBSD OSS driver ===<br />
snd_ich will work happily for this audio chip.<br />
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=== ThinkPads this chip may be found in ===<br />
* {{G40}}<br />
* {{R40}}, {{R40e}}<br />
* {{R50}}, {{R50e}}, {{R50p}}, {{R51}}, {{R51e}}, {{R52}}<br />
* {{T40}}, {{T40p}}, {{T41}}, {{T41p}}, {{T42}}, {{T42p}}, {{T43}}, {{T43p}}<br />
* {{X31}}, {{X32}}<br />
* {{X40}}, {{X41}}, {{X41T}}<br />
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[[Category:Components]]<br />
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=== See also ===<br />
* [[Problem with audio clipping]]</div>IneQuation