@twol first congratulations on your commit, I really like to see the name of the device in information about/devices.
I have noticed something, as you know I have a USB stick ( toshiba ) with two partitions a vfat (2GB) and another one to ext4 with the rest, my device has a total of 32 GB, well, it does not show me the information correctly, it only shows me the Free disk information of the vfat partition ( 1,99GB) does not detect the free space of ext4.
Someone the same thing happens?