[gentoo-amd64] 32-bit-app 3D acceleration on amd64

[Michael Kjorling]

I am trying to get a 32-bit game (specifically, Neverwinter Nights) to
run at an acceptable frame rate. I have x11-base/xorg-x11-6.8.2-r6 and
x11-base/x11-drm-20051028 installed and the following (among much
else, of course) in my /etc/X11/xorg.conf:

	Section "Module"
	    Load       "dri"
	EndSection
	Section "Device"
	     Identifier "** ATI Radeon"
	     Driver "radeon"

             # http://forums.gentoo.org/viewtopic-t-303091.html:
             Option "AGPMode" "4"
	EndSection
	Section "dri"
	  Mode 0666
	EndSection

The graphics card is a Radeon 9250 and works perfectly (as in, better
frame rates than the monitor can handle) in 2D and 64-bit 3D. After
several lengthy Google and web forum searches I came across a post [1]
suggesting that I do:

	export LIBGL_DRIVERS_PATH=/usr/X11R6/lib32/modules/dri

before launching the binary. However, I don't have any such directory:
/usr/X11R6/lib32/modules only contains a directory "extensions", and
setting LIBGL_DRIVERS_PATH to that provides no improvement whatsoever.

I also find the following in /var/log/Xorg.0.log:

(==) RADEON(0): Write-combining range (0xd0000000,0x8000000)
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 7, (OK)
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 7, (OK)
drmOpenByBusid: Searching for BusID pci:0000:01:00.0
drmOpenDevice: node name is /dev/dri/card0
drmOpenDevice: open result is 7, (OK)
drmOpenByBusid: drmOpenMinor returns 7
drmOpenByBusid: drmGetBusid reports pci:0000:01:00.0
(II) RADEON(0): [drm] DRM interface version 1.0
(II) RADEON(0): [drm] drmSetBusid failed (7, pci:0000:01:00.0), Permission denied
(EE) RADEON(0): [dri] DRIScreenInit failed.  Disabling DRI.
(II) RADEON(0): Memory manager initialized to (0,0) (1024,8191)
(II) RADEON(0): Reserved area from (0,768) to (1024,770)
(II) RADEON(0): Largest offscreen area available: 1024 x 7421
(II) RADEON(0): Render acceleration enabled
(II) RADEON(0): Acceleration enabled
(II) RADEON(0): Using hardware cursor (scanline 770)
(II) RADEON(0): Largest offscreen area available: 1024 x 7417
(II) RADEON(0): Direct rendering disabled

Note the "permission denied" part. This is odd, because:

	$ ls -l /dev/dri/      
	total 0
	crw-rw-rw-  1 root root 226, 0 Nov 29 09:52 card0
	$ 

Any suggestions as to how to get 32-bit graphics acceleration to work
without breaking my (currently working) 64-bit acceleration setup
would be much appreciated.

[1] http://nwn.bioware.com/forums/viewtopic.html?topic=451219&forum=72

-- 
Michael Kjörling, michael@××××××××.com - http://michael.kjorling.com/
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