> '/dev/vgname/lvname' instead of '/dev/mapper/vgname-lvname'. Indeed, I have found that `/dev/<VG>/<LV>` doesn't work as argument to `root=` on the kernel command line, whereas `/dev/mapper/<VG>-<LV>` works fine.
Maybe it merits a bug report. Maybe it'll be hard/inconvenient to make the kernel accept the `/dev/<VG>/<LV>` form, but if so scripts like `upgrade-grub` could come to the rescue and either warn about the problem or do the rewrite themselves. Stefan