Use opensource driver

• Remove radeon module blacklisting in /etc/modprobe.d
• Blacklist fglrx driver.
• Delete (backup) /etc/X11/xorg.conf. In general config is not needed to normal work.

Problem:

# glxinfo
name of display: :0.0
Xlib:  extension "GLX" missing on display ":0.0".
Xlib:  extension "GLX" missing on display ":0.0".
Segmentation fault

Remove fglrx drivers:

apt-get remove --purge fglrx-atieventsd fglrx-control fglrx-driver fglrx-modules-dkms fglrx-source glx-alternative-fglrx
apt-get remove --purge libfglrx:amd64 libfglrx:i386 libfglrx-amdxvba1:amd64 libfglrx-amdxvba1:i386 libgl1-fglrx-glx:amd64 libgl1-fglrx-glx:i386 libgl1-fglrx-glx-i386