Hi ! I got the same problem.
The problem (from replied i got) it's because of the live cd only.
So here is my way to "fix" this : (Well, without install mint; also, i didn't search more about a better way, if you found one just write it!) Note:
One problem about this method, you must do it at each boot...
1- Before any mint loading keep TAB pressed until 2 lines come at the screen. The last one should be
Just press enter
2- Keep TAB pressed (
immediately after you pressed enter) again until a menu appear. At the bottom of the screen you may have something that look like that (check from the end of your line)
append file=/cdrom/preseed/mint.seed boot=casper initrd=/casper/initrd.gz quiet splash persistent --
First you must replace
(you can't only add
because you couln'd do the next step because the menu will bug)
So now you have (for exemple)
append file=/cdrom/preseed/mint.seed boot=casper initrd=/casper/initrd.gz ro single persistent --
Then just press enter
3 - Now you should get a blue and grey menu, i don't remain exacly the option you should select but it something like "root terminal".
4 - Ok now you should get a console with the root access, type
If you are in a real persistent mode, you should see some line that look like
xorg.conf.<some number (in fact this is the date; <year><month>...)
Then do a
cat xorg.conf.<a number from the list of file from the ls command>
on every file listed by the ls command.
We search a file that have many line (more than ~20), about (or more than a screen). In fact, we look for a file where you can't find "Defaut <something>" section. (If you have some "Default" section but have also other kind of section (or option like the adresse of your graphic card (PCI:0:0), your resolution,...) you probably found a good xorg.conf for the next step)
When you got one file like that you just do
cp xorg.conf.<the number from the file where you find sections other than "Default" xorg.conf
You could also rename xorg.conf.<number> for something like myxorg.conf, so in the futur reboot you will be able to skip the ls and cat step, do the rm but then only
cp myxorg.conf xorg.conf
then just type
Now your driver should be loaded and have your mint desktop ready !