I usually check to see what kernel module is loaded:
lsmod |grep drm

Some examples from some of my actual machines:
drm                   236290  4 i915,drm_kms_helper
drm                   236330  4 radeon,ttm,drm_kms_helper

The log referenced in the other response is also a very good place to look.

* Note that drm stands for Direct Render Manager

On Sun, Jan 22, 2012 at 4:57 PM, Ilya Khlopotov
<ilya.khlopo...@gmail.com> wrote:
> Hello Craig,
>
>> My question is how do you tell what it detected?
> The easiest way is to check log file /var/log/Xorg.0.log
>
> The other way could be:
> Xorg -configure -config /tmp/xorg.conf
> less /tmp/xorg.conf
>
> Best regards,
> ILYA
>
> On Sun, 2012-01-22 at 16:44 -0700, Craig McLean wrote:
>> Hello.
>>
>> I have a question about xorg drivers.  I’m using xorg 7.5 on Debian Squeeze 
>> 6.0.3.  In more recent versions of the X system you don’t need an xorg.conf 
>> configuration file because the system is now able to properly auto detect 
>> most of your hardware.  My question is how do you tell what it detected?  
>> I’d like to know what xserver it decided to use.  Based on the hardware in 
>> my laptop I’m assuming some kind of Intel one, but I’d like to confirm that.
>>
>> Craig.
>>
>>
>>
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