after the latest updates I get a black screen during bootup... it seems related to the vt.handoff=7 feature of grub.
Infact removing this I can see at least the virtualterminal during bootup.
Maybe it is not correctly patched the latest release of grub (2.00-5ubuntu1)
ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: grub2 (not installed)
ProcVersionSignature: Ubuntu 3.5.0-15.22-generic 3.5.4
Uname: Linux 3.5.0-15-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.5.2-0ubuntu4
Architecture: amd64
Date: Thu Sep 20 10:21:44 2012
InstallationMedia: Kubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120909)
ProcEnviron:
LANGUAGE=
TERM=xterm
PATH=(custom, no user)
LANG=it_IT.UTF-8
SHELL=/bin/bash
SourcePackage: grub2
UpgradeStatus: No upgrade log present (probably fresh install)
Update: Bug is still *not* fixed with kernel 3.5.0-15.23 on Ati Radeon cards.
Status changed to 'Confirmed' because the bug affects multiple users.