[Trisquel-users] Resolution issue

[joshuaallenwatson]

I'm a Linux newbie entirely and I'm having resolution issues with my GPU. I  
don't want to install non-free drivers, so I was wondering if there was a way  
to do it in terminal, or I could edit xorg.config
I'm a newbie, so you'll have to walk me through. I ran lspci|grep VGA to find  
out what gpu I had, and I have this:
[Radeon HD 6520G]