With UXA in xorg.conf all apps were sluggish and I had no 3d at all.
Changed to EXA and all is well again.

Section "Device"
Identifier "Configured Video Device"
Driver "intel"
Option "AccelMethod" "EXA"
Option "MigrationHeuristic" "smart"
EndSection

CPU: Single core Intel Pentium 4 (HT) cache 1024 KB flags (sse3 nx lm) bmips 5592.21
Clock Speeds: (1) 2792.974 MHz (2) 2792.974 MHz
Graphics: Card Intel 82915G/GV/910GL Integrated Graphics Controller X.Org 1.6.1.901 Res: 1280x1024@60.0hz
GLX Renderer Mesa DRI Intel 915G GEM 20090418 2009Q1 x86/MMX/SSE2 GLX Version 1.4 Mesa 7.4.4 Direct Rendering Yes

Running Debian sid with liquorix kernel, lxde and using slim.

Also changed /etc/X11/Xwrapper.config from "nice_value = 0" to "nice_value = -1"

xserver-xorg:
Installed: 1:7.4+3
xserver-xorg-video-intel:
Installed: 2:2.7.1-1+b0.sidux.1

Openarena and Chromium BSU both play just fine.
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UXA is working now with the latest mesa/xorg in sid. Although glxgears using exa and uxa are pretty much the same.

System: Host craigevil Kernel 2.6.30-3.dmz.2-liquorix-686 i686 (32 bit) Distro Debian GNU/Linux squeeze/sid
CPU: Single core Intel Pentium 4 (HT) cache 1024 KB flags (sse3 nx lm) bmips 5593.92
Clock Speeds: (1) 2793.281 MHz (2) 2793.281 MHz
Graphics: Card Intel 82915G/GV/910GL Integrated Graphics Controller X.Org 1.6.2.901 Res: 1280x1024@60.0hz
GLX Renderer Mesa DRI Intel 915G GEM 20090712 2009Q2 RC3 x86/MMX/SSE2 GLX Version 1.4 Mesa 7.5.1 Direct Rendering Yes


DRI2 is shown in Xorg.0.log as loading and there are no error (EE) messages.
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