The instructions at https://wiki.ubuntu.com/HardwareSupport ... ll/XPS/15z need to be slightly changed in order for it to work (for me)
Boot your live CD, when it says 'automatic boot in X seconds', press any key to get to the additional options
With the top option selected ('Start Linux Mint'), press the TAB key to edit the option
Now according to the ubuntu wiki, we should be using the ' acpi_backlight=vendor dell_laptop.backlight=0 ' command as Linux mint 14 has the 3.5 kernel. However, this does not work for me.
Instead, add the following command before 'quiet spash --'
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acpi=noirq
It should then go to the desktop and you can install.
When you reboot for the first time, you must press the 'E' key at the GRUB menu for the install you just made (if the GRUB menu doesn't appear, I think you hold shift when booting?)
Here we need to use the original command, so before 'quiet spash', add
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acpi_backlight=vendor dell_laptop.backlight=0

To make this permanent, open terminal and enter this command
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sudo gedit /etc/default/grub
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GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
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GRUB_CMDLINE_LINUX_DEFAULT="acpi_backlight=vendor dell_laptop.backlight=0 quiet splash"
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sudo update-grub
I don't know if this will work for anyone else, but it's the only way I have found to do it.
Please comment if it does or doesn't work so we can help others