I have nearly the same configuration on my laptop, and exactly the same issue. I have tried the latest mainline kernel (2.6.38-999-generic_2.6.38-999.201101281114_amd64), and found that the issue persists. The ACPI functions were not enabled in the latest kernel and the battery was still not detected.
I have nearly the same configuration on my laptop, and exactly the same issue. I have tried the latest mainline kernel (2.6.38- 999-generic_ 2.6.38- 999.20110128111 4_amd64) , and found that the issue persists. The ACPI functions were not enabled in the latest kernel and the battery was still not detected.