Hi, i had a similar problem on my laptop:
* I have 2 encrypted partitions: sda5 and sda6:
   /dev/sda5 -> swap partition
   /dev/sda6 -> mapped to /var (with binding /var/home -> /home)
* Both partitions use the same password
* I use uswsusp for hibernate/resume features
* The initramfs step asks me for password at bootup: swap partition only
* Later the init script ask me again for the password of the /var partition

I think it makes sense to decrypt all filesystem in /etc/crypttab at the 
initramfs step.
Here is the patch I have tested on my laptop:
* it decrypts all /etc/crypttab partitions at initramfs stage
* it tries to unlock with same password all partitions.
* it works both with usplash and with console bootup

After doing the changes, execute "sudo update-initramfs -u"


** Attachment added: "patch-cryptroot-initramfs.diff"
   http://launchpadlibrarian.net/15102666/patch-cryptroot-initramfs.diff

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Should try given password for next partition
https://bugs.launchpad.net/bugs/139057
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