Interestingly enough, EnvyNG, which setup my X1300 (almost) perfectly under 8.04 with only a few tweaks required, no longer works under 8.10. After using that, I'd end up with glxinfo & fglrxinfo giving either segfaults or other bizarre errors, such as "../../src/xcb_io.c:352: _XReply: Assertion `!dpy->xcb->reply_data' failed".
Same issue on update from 8.04 -> 8.10. Solved with Håvard and Eric's tips:
sudo rm -r /var/lib/ dkms/fglrx/ *
sudo apt-get remove fglrx*
downloaded ATi's latest installer from their site
sudo ./ati-driver- installer- 8-12-x86. x86_64. run
reboot
Interestingly enough, EnvyNG, which setup my X1300 (almost) perfectly under 8.04 with only a few tweaks required, no longer works under 8.10. After using that, I'd end up with glxinfo & fglrxinfo giving either segfaults or other bizarre errors, such as "../../ src/xcb_ io.c:352: _XReply: Assertion `!dpy-> xcb->reply_ data' failed".