Checking the kernel source does not find anything that should have regressed nor fixed external mic on this machine, so next question would be:
- Is this working on the pre-install image or was there a miss in the testing?
- Is there any specific audio patches (e g an alsa daily dkms) applied to the pre-install image?
Looking at http:// www.ubuntu. com/certificati on/hardware/ 201307- 14019/ it seems this machine was pre-installed with 12.04.2 LTS.
Checking the kernel source does not find anything that should have regressed nor fixed external mic on this machine, so next question would be:
- Is this working on the pre-install image or was there a miss in the testing?
- Is there any specific audio patches (e g an alsa daily dkms) applied to the pre-install image?