Comment 10 for bug 232173

From what I've found, the EeePC 901/1000/1000h devices also have a similar problem with the internal microphone.

As of Alsa 1.0.17, the 900's internal mic has been fixed but the 901/1000/1000h's internal mic is still a problem.

These later devices were fixed in alsa-kmirror.git: commit df5d08005f3b78dab8aef45fa5e2ca9f8b52220f
posted after the v1.0.17 tag. Presumably, these will be fixed in Alsa 1.0.18