For a few releases, auto-mount of LUKS devices has been broken in Mandriva (bugs #27259 and #30115), because we had the following udev rule as default:

KERNEL=="dm-[0-9]*", OPTIONS="ignore_device"

This rule existed because lvm2 setup got broken when udev tried to run vol_id on dm devices (see Let udev play with snapshots thread on linux-lvm ML). This has been fixed ages ago (in lvm2-2.02.13) with the following change: When adding snapshot leave cow LV mapped device active after zeroing (commit).

So, the "ignore dm devices" workaround has been removed from our udev rules, and LUKS devices should now be auto-mounted by default on modern desktops \o/ (GNOME users, enjoy)