[Trisquel-users] Dual Monitors

[ethancrist96]

I just installed Trisquel yesterday. My two monitors are duplicating the  
display instead of extending as two separate displays. After trying to  
install the Linux proprietary driver for Radeon, it blackscreened on startup.  
Are there any libre graphics cards/Trisquel compatible Radeon drivers that  
can accomplish dual monitors? This is a deal-breaker for me.

Also: when it detects non-free software, is it always going to black screen?  
I would prefer it simply notify me and not let it install. When booting  
normally after the propriety driver install, it black-screened. When booting  
in upstart, I saw recursively looping messages saying something like "Free  
Firmware Required". I appreciate the blocking of proprietary stuff but I  
would prefer it not to require me to essentially reinstall the OS.

Thanks.