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Grub "quiet splash" + linux-image-3.2.0-40-generic + full disk encryption = boot failure

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http://askubuntu.com – From this morning the boot process on my laptop is no longer working. The only relevant change from yesterday (when all was working fine) has been a kernel update (from 3.2.0-39-generic to 3.2.0-40-generic). When grub tries to boot the 3.2.0-40-generic kernel, I get only a black screen (the screen seems powered off). After many tries and googling around, I found the following: if I change the CMDLINE_LINUX_DEFAULT grub parameter (inside /etc/default/grub) from the default value "quiet splash" to "nomodeset" the boot process works but the screen has a lower resolution than before (from 1600x (HowTos)