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 1600x900 to 800x600).

This is not happening with the previous kernel version (3.2.0-39-generic). Even with "quiet splash" enabled, all is working fine with the correct resolution.

An important note: my disk is fully encrypted (actually the setup is LVM + encryption). So when the boot works fine, after the grub selection screen I am asked to insert the passphrase for decrypting the whole file system.

Is there a way to fix this misbehaviour? I would like to avoid workarounds like using always an old kernel or using "nomodeset" as a default parameter.

Thank you in advance

  • Any manually installed graphics drivers, ATI, Nvidia? – mikewhatever Apr 9 '13 at 10:45
  • No,I didn't installed any graphic driver manually. Since everything was working fine out-of-the-box from the very beginning, I had no need to install any graphic driver – pastoreerrante Apr 9 '13 at 11:04
  • This sounds like a bug and should be reported as such. How do I report a bug? – gertvdijk Apr 9 '13 at 11:10

I was having that problem and after lots of time looking for what was causing t, i discovered that software manager wasn't updating initramfs leaving the boot state broken. But it only hapens with a few people. I don't know why.

Try to update the inirtramfs:

sudo update-initramfs -u

Tell-me if it worked.

EDIT: It seems its a bug, not in the update manager but in the kernel. https://bugs.launchpad.net/bugs/1167114

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