kernel 3.8.4-smp mess up mount on 32 bit
 

use 32 bit and mount doesn't work properly after kernelupgrade today 28/03/13 to kernel 3.8.4-smp.
$ udisks --mount /dev/sdb
Mount failed: Error mounting: mount: unknown filesystem type 'vfat'

# mount -t vfat /dev/sdb /media/sdb1
mount: unknown filesystem type 'vfat'

it worked with kernel 3.7.10 ..

update:
solved it by using mkinitrd_command_generator.sh

Since you solved this yourself, I'll answer here just to get this off the "zero-reply" list. No idea why that script helped you solving the issue though.

Eric

OK. After the kernel upgrade I run mkinitrd:
mkinitrd -c -k 3.8.4-smp -m ext4 -f ext4 -r /dev/sda1

after that udisks did not work:
$ udisks --mount /dev/sdb
Mount failed: Error mounting: mount: unknown filesystem type 'vfat'

then I used mkinitrd_command_generator.sh
which generated:
mkinitrd -c -k 3.8.4-smp -f ext4 -r /dev/sda1 -m usb-storage:ehci-hcd:ehci-pci:usbhid:uhci-hcd:mbcache:jbd2:ext4 -u -o /boot/initrd.gz

then the udisks / mount problem was solved.