r300 falling back on swrast

[Jeremy Huddleston]

So I've got a PowerBook that I like to use to determine if issues I  
come across are XQuartz specific or not... I've been using Fedora on  
it for a while, but jumped ship to Ubuntu because of some annoyances.

With Ububntu, however, the r300 DRI driver is not being selected.   
It's falling back on swrast for some reason.  I've bumped to trunk for  
libdrm, mesa, ati drivers.

The Xorg.0.log is here:
http://cloud.cs.berkeley.edu/~jeremy/ati-powerbook/Xorg.0.log

And a successful log from under Fedora is here:
https://bugzilla.redhat.com/attachment.cgi?id=341960

Interesting log points:
...
(==) RADEON(0): Backing store disabled
(II) RADEON(0): [DRI] installation complete
(II) RADEON(0): [drm] removed 1 reserved context for kernel
(II) RADEON(0): [drm] unmapping 8192 bytes of SAREA 0xf3162000 at  
0x48026000
(II) RADEON(0): [drm] Closed DRM master.
(WW) RADEON(0): Direct rendering disabled
(II) RADEON(0): XAA Render acceleration unsupported on Radeon  
9500/9700 and newer. Please use EXA instead.
(II) RADEON(0): Render acceleration disabled
(II) RADEON(0): num quad-pipes is 1
(II) RADEON(0): Using XFree86 Acceleration Architecture (XAA)
...
(II) AIGLX: Screen 0 is not DRI2 capable
(II) AIGLX: Screen 0 is not DRI capable
(II) AIGLX: Loaded and initialized /usr/lib/dri/swrast_dri.so
(II) GLX: Initialized DRISWRAST GL provider for screen 0

Here is the start log with no xorg.conf (and the fbdev driver moved  
aside to prevent it complaining about needing busIDs):
http://cloud.cs.berkeley.edu/~jeremy/ati-powerbook/Xorg.0.no_xorg.conf.no_fbdev.log

It's not much different than the other log, but I figured I'd provide  
it anyways, since it should "just work"...



0000:00:10.0 VGA compatible controller [0300]: ATI Technologies Inc  
RV350 [Mobility Radeon 9600 M10] [1002:4e50]
	Subsystem: ATI Technologies Inc RV350 [Mobility Radeon 9600 M10]  
[1002:4e50]
	Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-  
Stepping- SERR- FastB2B- DisINTx-
	Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort-  
<TAbort- <MAbort- >SERR- <PERR- INTx-
	Latency: 255 (2000ns min), Cache Line Size: 32 bytes
	Interrupt: pin A routed to IRQ 48
	Region 0: Memory at b8000000 (32-bit, prefetchable) [size=128M]
	Region 1: I/O ports at 0400 [size=256]
	Region 2: Memory at b0000000 (32-bit, non-prefetchable) [size=64K]
	Expansion ROM at f1000000 [size=128K]
	Capabilities: <access denied>
	Kernel driver in use: radeonfb