Not sure if it will help you like it did me as I was running nVidia...but,
before logging in I had to hit ctrl + alt + backspace to get to the
terminal. Then I was able to run my NAME.run file (the driver install
package) and then it loaded to this other screen after I logged in which
told me that the acceleration would be off but then I was able to go into
that and select the 'legacy' codec which was the package I had installed,
selected it, and after a reboot or two it ran. Then I went to
System>>Preferences>>Screen Resolutions and was able to change my
resolutions at that point (but not until AFTER I had the proper codec set
selected from the selection screen).