Comment 8 for bug 538383

The just-released ALSA 1.0.23 may help.

From the changelog:

HDA Codec driver

    - ALSA: hda - Add initial support for Thinkpad T410s HDA codec
    attached please find a patch that adds support for at least the T410s
    HDA codec. Most likely it will also add support for the T410 and T510
    based models.
    The patch was derived from Ideapad support. Support for the laptop's and
    docking-station output connectors as well as the docking-station microphone
    connector and the laptops internal devices has been tested. Since it has been
    developed without a data-sheet available, support for digital outputs and the
    laptop's microphone input may well be incorrect.
    Microphone mute functionality is not included:
    The microphone mute button seems to be reported through thinkpad_acpi key
    0000101b. The mute button LED seems to be wired to thinkpad_acpi led
    number 15.

Ubuntu 10.04 "Lucid Lynx" is currently carrying ALSA 1.0.22.1+dfsg-0ubuntu3.