Comment # 2 on bug 1189136 from Fabian Vogt

Please try the following:

1. Insert a card
2. Wait for the notification, mount the device
3. Run "udisksctl unmount -p /dev/mmcblk0p1"
4. Does "udisksctl status" still show it? Still listed by lsblk?
5. Run "udisksctl power-off -p /dev/mmcblk0p1"
6. Does "udisksctl status" still show it? Still listed by lsblk?
7. Re-insert the card and wait a bit
8. Does "udisksctl status" show it? Does lsblk show it?

My guess is that "power-off" behaves weirdly with either udisks or the card
reader.