Problem upgrading DRM from http://dri.sourceforge.net/

[surgeon]

when I try to compile the kernel modules in http://www.xfree86.org/~alanh/linux-drm-4.2.0-kernelsource.tar.gz i got errors referring to i810
I don't have an i810 card, so I tried to modify the makefile but it didn't work
does anyone know another way to enable my Rage128 DRI? Xfree 4.2.1 says this:

[Graeme Lufkin]

I had the same issue with my Rage 128 card (same message in the XFree86 log). Here's how I solved it:
I downloaded the same package, and copied the drm directory into my linux kernel tree. (That is, I moved /usr/src/linux/drivers/char/drm to drm_old, and put the new drm directory in its place.) Then, using the same kernel config options (r128 as a module) I rebuilt the kernel. I put r128 in /etc/modules.autoload and rebooted. Now the dri bit loads properly, and by running glxgears I see a ~6 fold speedup in framerate.

Not sure why the gentoo-sources kernel has old drm stuff either, but oh well.
By the way, in my XF86config, I load the 'glx' and 'dri' modules, and set the mode on DRI using

[dreamdreams]

Followed Graeme Lufkin's steps, my glxgear scre boosted from ~90 to ~490, it's amazing.

But didn't feel big difference on running other X programms.

[Lovechild]