How to tell if GEM is enabled.

Vasily Khoruzhick anarsoul at
Thu Nov 6 14:04:11 PST 2008

On 6 November 2008 19:25:26 Protas Oleksiy wrote:
> Hi,
> I am sorry for asking on the list such a question, but how one makes
> sure GEM is used? I'll explain in more details:
> mesa-7.2
> xorg-server-1.5.2
> libdrm-2.4.0
> xf86-video-intel-2.5.0
> vanilla linux-2.6.28-rc3
> EXA acceleration
> When I try running glx app on this setup I get 'Cannot use TTM' error,
> so after googling I've found out that TTM support is disabled in
> mesa>=7.1. Apparently the system should make use of GEM since it is
> present in both kernel and video driver, but for some reason it does
> not and I end with SLOW glx visuals(~10x performance drop).
> My question is how I check and possibly enable GEM in my OpenGL stack?
> Thank you in advance.
> PS: dmesg and xorg.log are of no help

I suggest to rollback to 2.6.27 kernel (or any non-gem kernel). At least on my 
gma950 I failed to get 3D working - I have same issues as yours (~3-10x 
performance drop), even with latest mesa/libdrm/xf86-video-intel from git.

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