@Daniel, 
That package wasn't installed.

Am now tracking lucid(2.6.32-2-generic and libasound2 1.0.21a-1ubuntu1) 
If I remove the line in alsa-base.conf the looping behaviour reliably appears 
after a short while.
The dmesg shows: 
[84644.363779] HDA Intel 0000:00:14.2: PCI INT A disabled
[84644.720039] HDA Intel 0000:00:14.2: PCI INT A -> GSI 16 (level, low) -> IRQ 
16
[84644.857625] hda_codec: ALC861: BIOS auto-probing.
[84644.858887] input: HDA Digital PCBeep as 
/devices/pci0000:00/0000:00:14.2/input/input9
[85114.760019] hda-intel: azx_get_response timeout, switching to polling mode: 
last cmd=0x001f0500

I booted back to the karmic kernel(2.6.31-14-generic) and installed the package 
you mentioned:
[  190.323592] HDA Intel 0000:00:14.2: PCI INT A disabled
[  190.538290] HDA Intel 0000:00:14.2: PCI INT A -> GSI 16 (level, low) -> IRQ 
16
[  190.538385] HDA Intel 0000:00:14.2: irq 24 for MSI/MSI-X
[  190.664379] hda_codec: ALC861: BIOS auto-probing.
[  190.665210] input: HDA Digital PCBeep as 
/devices/pci0000:00/0000:00:14.2/input/input9

So it appears to enable MSI automatically without the line in alsa-base.conf
Sound works just fine. Nice job!

@rizlo
Sorry to hear it doesn't work for you.

My bios version is 2.30. This is the latest version I found on the
toshiba website.

-- 
[karmic]snd_hda_intel: audio moves to polling mode and starts repeating 
(Toshiba A100-259/ATI IXP SB4x0 HD/ALC861)
https://bugs.launchpad.net/bugs/391114
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