Comment 14 for bug 1470862

>The "who" command verified to me all my tty consoles are fully functional, only their displays are blacked out.

We know that already, the issue is that they are not really usable if blacked out: we have a monitor/display for a reason.

We also know that getting rid of the fglrx driver solves the issue right away, unfortunately the fglrx driver also exists for a reason, which would be that the open source driver can't do the same things: at least in my experience, I'm stuck with very basic graphics, I can't set the monitor brightness, I can't use hardware acceleration or use Compiz effects.
These are real drawbacks, if I have to do without this stuff, I may as well do without the ATI video card and use the integrated graphics on the motherboard.