Gentlemen; please. This is a minor disagreement that is distracting from
the main issue. We know that AMD have not yet released drivers for a set
of older cards that work with Quantal (or more specifically, xserver
1.13). Let's focus on that.

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https://bugs.launchpad.net/bugs/1058040

Title:
  fglrx-installer not working with HD2000-4000 "legacy" cards in Quantal

Status in Release Notes for Ubuntu:
  New
Status in “fglrx-installer” package in Ubuntu:
  Triaged

Bug description:
  Following the AMD decision to change to a new driver support model for
  Radeon™ HD 4000, HD 3000 and HD 2000 series cards for the legacy 12.6
  driver as per http://support.amd.com/us/gpudownload/linux/legacy/Pages
  /legacy-radeon_linux.aspx , fglrx-installer installs non-working
  drivers for users of these cards.

  I suggest the addition of an fglrx-legacy package to install the AMD
  legacy drivers for users with older cards or patch the current code
  base for use with these cards.

  One of the outstanding issues for addressing this bug is AMD currently does 
not plan to support XServer 1.13 (for Ubuntu the package is xserver-xorg-core) 
for the legacy 12.6 driver, which Quantal uses:
   apt-cache policy xserver-xorg-core
  xserver-xorg-core:
    Installed: 2:1.13.0-0ubuntu6
    Candidate: 2:1.13.0-0ubuntu6
    Version table:
   *** 2:1.13.0-0ubuntu6 0
          500 http://archive.ubuntu.com/ubuntu/ quantal/main i386 Packages
          100 /var/lib/dpkg/status

  Output for fglrx 9.00 [1]:
  # lspci|grep VGA
  01:05.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI 
RS780L [Radeon HD 3000]
  # modprobe fglrx
  FATAL: Error inserting fglrx 
(/lib/modules/3.5.0-15-generic/updates/dkms/fglrx.ko): No such device
  # dmesg|tail -n3
  [ 6785.693869] [fglrx] Maximum main memory to use for locked dma buffers: 
7132 MBytes.
  [ 6785.694089] [fglrx:firegl_init_device_list] *ERROR* No supported display 
adapters were found
  [ 6785.694091] [fglrx:firegl_init_module] *ERROR* firegl_init_devices failed
  # dpkg --list|grep fglrx
  ii fglrx 2:9.000-0ubuntu1 amd64 Video driver for the AMD graphics accelerators
  ii fglrx-amdcccle 2:9.000-0ubuntu1 amd64 Catalyst Control Center for the AMD 
graphics accelerators

  [1] https://bugs.launchpad.net/ubuntu/+source/fglrx-installer-
  updates/+bug/1032672/comments/34

  !!!!!!!! WARNING !!!!!!!
  The following workaround has produced mixed results and left some users with 
temporarily broken systems. It is not recommended for production systems or 
novice users that are not comfortable with basic console/non-GUI recovery. USE 
AT OWN RISK.
  WORKAROUND: sudo add-apt-repository ppa:makson96/fglrx && sudo apt-get update 
&& sudo apt-get -y upgrade && sudo apt-get -y install fglrx-legacy

  This workaround will downgrade X to 1.12 and install the AMD legacy
  fglrx 8.97 (Catalyst 12.6).

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