Affects me as well. Roughly 25% of the times I boot my computer, I get a
completely blank screen instead of the dm-crypt passphrase prompt.
Typing in the passphrase works buts results in a blank screen when
logging into ubuntu (or kubuntu in my case). This could be resolved by
pulling the monitor plug and plugging it back in again (or probably by
switching screens with CTRL-ALT-F6 /F7 as OP noted).
Computer is a Dell laptop with a monitor plugged in via HDMI on boot.
Unsure exactly which dumps are useful so I will do those relevant for me that
the OP did:
$ lsb_release -rd
Description: Ubuntu 12.04.1 LTS
Release: 12.04
$ apt-cache policy dmsetup
dmsetup:
Installed: 2:1.02.48-4ubuntu7.1
Candidate: 2:1.02.48-4ubuntu7.1
Version table:
*** 2:1.02.48-4ubuntu7.1 0
500 http://se.archive.ubuntu.com/ubuntu/ precise-updates/main amd64
Packages
100 /var/lib/dpkg/status
2:1.02.48-4ubuntu7 0
500 http://se.archive.ubuntu.com/ubuntu/ precise/main amd64 Packages
$ uname -a
Linux leob-hp 3.2.0-34-generic #53-Ubuntu SMP Thu Nov 15 10:48:16 UTC 2012
x86_64 x86_64 x86_64 GNU/Linux
$ sudo dmidecode -s system-product-name
HP Pavilion dv6 Notebook PC
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https://bugs.launchpad.net/bugs/816267
Title:
encryption (dm-crypt) passphrase prompt on oneiric does not set focus
automatically for input during boot up
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