Due to the change to in-kernel media-presence polling for removeable media when
>=kernel-2.6.38 is in use we should consider adding an elog message telling the
user to add something like "block.events_dfl_poll_msecs=1000" to his kernel
command line in grub/lilo or else users won't be able to eject CDs/DVDs
throught the eject button of their drives once these media were accessed. See http://lwn.net/Articles/423619/ for reference.
Т.е. проблема возникает с ядром >= 2.6.38. Нужно добавить "block.events_dfl_poll_msecs=1000" к командной строке ядра.
У самого пока не было времени разобраться или попробовать это.