How to uninstall dri?

Hi all.
I have a couple of questions which are not answered on the site.

First, let me explain that I have an ati rage128 card and ubuntu 6.06.
I was not satisfied of the acceleration which came by default: it was 
slower and gave me problems with respect to the oldeer, but still working 
distribution on my pc (a mandriva 2005LE).
So I updated dri, as explained in the site
http://wiki.ubuntu-it.org/Mesa/Dri?highlight=%28mesa/dri%29

Basically, I downloaded

common-20060403-linux.i386.tar.bz2
rage128-20060403-linux.i386.tar.bz2

I uncompressed them, and ran the install.sh

The first was ok. For the second, I get an error. The log says
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
make DRM_MODULES=r128.o modules
make[1]: Entering directory 
`/home/stumbo/download/rage128-20060403-linux.i386/drm/linux-core'
make -C /lib/modules/2.6.15-26-k7/build  SUBDIRS=`pwd` DRMSRCDIR=`pwd` 
modules
make[2]: Entering directory `/usr/src/linux-headers-2.6.15-26-k7'
   Building modules, stage 2.
   MODPOST
make[2]: Leaving directory `/usr/src/linux-headers-2.6.15-26-k7'
make[1]: Leaving directory 
`/home/stumbo/download/rage128-20060403-linux.i386/drm/linux-core'
WARNING: Error inserting drm 
(/lib/modules/2.6.15-26-k7/kernel/drivers/char/drm/drm.ko): Unknown symbol 
in module, or unknown parameter (see dmesg)
FATAL: Error inserting r128 
(/lib/modules/2.6.15-26-k7/kernel/drivers/char/drm/r128.ko): Unknown 
symbol in module, or unknown parameter (see dmesg)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++


Now I result in no kind of acceleration: much worse than before. Drm 
doesn't load:

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
# dmesg | grep drm
[17180335.284000] drm: disagrees about version of symbol boot_cpu_data
[17180335.284000] drm: Unknown symbol boot_cpu_data
[17180335.284000] r128: Unknown symbol drm_open
[17180335.284000] r128: Unknown symbol drm_fasync
[17180335.292000] r128: Unknown symbol drm_poll
[17180335.292000] r128: Unknown symbol drm_core_get_reg_ofs
[17180335.292000] r128: Unknown symbol drm_irq_uninstall
[17180335.292000] r128: Unknown symbol drm_get_dev
[17180335.292000] r128: Unknown symbol drm_ioctl
[17180335.292000] r128: Unknown symbol drm_exit
[17180335.292000] r128: Unknown symbol drm_debug
[17180335.292000] r128: Unknown symbol drm_core_get_map_ofs
[17180335.292000] r128: Unknown symbol drm_init
[17180335.292000] r128: Unknown symbol drm_vbl_send_signals
[17180335.292000] r128: Unknown symbol drm_cleanup_pci
[17180335.292000] r128: Unknown symbol drm_ati_pcigart_init
[17180335.292000] r128: Unknown symbol drm_mmap
[17180335.292000] r128: Unknown symbol drm_order
[17180335.292000] r128: Unknown symbol drm_ati_pcigart_cleanup
[17180335.292000] r128: Unknown symbol drm_core_reclaim_buffers
[17180335.292000] r128: Unknown symbol drm_release
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++


First question: (how) can I solve this?

Second (and most important) question: assume I want to go back to my 
previous configuration.
How do I do this?
There is no uninstall script, nor a "uninstall" option in the install.sh 
script. I can't realize what has been done during install...
And, after having uninstalled it (if I will be able...) how do I recover 
the previous files? Did the install overwrite some file from some package 
that needs then to be reinstalled? And which?

Thank you a lot for your help.

Fabio Stumbo

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