Description of problem:
I have kms disabled from the kernel command line. In Fedora 14 it was no
problem, but in Fedora 15 it looks like without kms dri is using software
rendering.
This is the main difference in Xorg.log when kms is enabled, and when it is disabled:

- (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
- (II) AIGLX: enabled GLX_INTEL_swap_event
- (II) AIGLX: enabled GLX_SGI_swap_control and GLX_MESA_swap_control
- (II) AIGLX: enabled GLX_SGI_make_current_read
- (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects
- (II) AIGLX: Loaded and initialized /usr/lib/dri/r600_dri.so
- (II) GLX: Initialized DRI2 GL provider for screen 0
+ (II) AIGLX: Screen 0 is not DRI2 capable
+ drmOpenDevice: node name is /dev/dri/card0
+ drmOpenDevice: open result is 12, (OK)
+ drmOpenByBusid: Searching for BusID pci:0000:01:05.0
+ drmOpenDevice: node name is /dev/dri/card0
+ drmOpenDevice: open result is 12, (OK)
+ drmOpenByBusid: drmOpenMinor returns 12
+ drmOpenByBusid: Interface 1.4 failed, trying 1.1
+ drmOpenByBusid: drmGetBusid reports pci:0000:01:05.0
+ (EE) AIGLX error: Calling driver entry point failed
+ (EE) AIGLX: reverting to software rendering
+ (II) AIGLX: Loaded and initialized /usr/lib/dri/swrast_dri.so
+ (II) GLX: Initialized DRISWRAST GL provider for screen 0

Version-Release number of selected component (if applicable):
xorg-x11-server-Xorg-1.10.2-1.fc15.i686
xorg-x11-drv-ati-6.14.1-1.20110504gita6d2dba6.fc15.i686

How reproducible:
Append to the kernel command line nomodeset=1.
Look at the Xorg.0.log, test for example with some OpenGL screensaver - it is
very sluggish.

I've tried to see if the problem is present with ati driver from Fedora 14,
but it does not compile with the Xorg from Fedora 15.