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I have a Sony Vaio E series laptop with UEFI due to which I was unable to install Ubutnu 12.04 on it, and installing the latest 12.10 was giving me brightness issues in which Fn key combination to control the brightness was not working and the AMD graphic drivers were all incompatible without any satisfying support from AMD.

So I decided to install Ubuntu 12.04.2 the latest LTS version and it was mentioned in the release notes that it is able to install on UEFI enabled machine and there were not any issues mentioned on the launchpad regarding the brightness, so I decided to go on, but after the installation, on booting it is giving me a blank screen, though I can hear the booting sound.

Please help.

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tried nomodeset from here ? regarding backlight issue, it is a very common problem. Due to different ACPI events & driver configuration. Can look at here - wiki.kubuntu.org/Kernel/Debugging/Backlight –  Web-E Mar 17 '13 at 10:03

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