Am I using the "ati" or "vesa" driver?

Wed Jul 30 05:52:47 PDT 2014

Hello,

My computer is an ASUS x102ba [1].

When I type:
$ startx

I see that my display is strange:
- 1 screen only used (the external VGA screen)
- the font is too big
- the "xrandr" command tells me "Failed to get size of gamma for output default"

So, I think that I am using the "vesa" Xorg driver for generic VESA video cards instead of the "ati" video driver.

How to be sure about that?

Thank you.
Best regards.

[1] http://www.asus.com/Notebooks_Ultrabooks/X102BA/specifications/