In my experience with a T420 U12.04b2 the SDHC card appeared. However, had (different) problems https://bugs.launchpad.net/ubuntu/+source/linux/+bug/975305.
In U10.10,11.10 I didn't see the SDHC appear at all when inserted. Nothing in the logs. In U12.04b2 I see it appear and can read/write although I'm not convinced reliably read-write and have problems with dd.
In my experience with a T420 U12.04b2 the SDHC card appeared. However, had (different) problems /bugs.launchpad .net/ubuntu/ +source/ linux/+ bug/975305.
https:/
In U10.10,11.10 I didn't see the SDHC appear at all when inserted. Nothing in the logs. In U12.04b2 I see it appear and can read/write although I'm not convinced reliably read-write and have problems with dd.