ATI DRIVER on DEBIAN / UBUNTU / GOS ...

Forget all the old complex installation methods with restricted drivers & xorg.conf modifications ...
Make it simpler!

what you need to make it work is:

1. First of all: always make a copy of you old xorg.conf file:
   $ sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf .myoldconf
2. install xserver-xgl:
   $ sudo apt-get install xserver-xgl
   You don't have to do anything else to set it up but restarting X (press: Ctrl + Alt + Bksp)
3. download ati driver from http://ati.amd.com
   for Radeon cards: http://ati.amd.com/support/drivers/linux/linux-radeon.html
4. install it (selecting all the default options)
   $ sudo sh ati-driver-installer-8-10-x86.x86_64.run
   In case of errors: don't worry, you may just need the kernel headers & gcc compiler. Checkout the log file shown upon compilation failure to see what you need.
   In my case it was:
   
   • $ sudo apt-get install linux-headers-2.6.24-26-generic (!! check the your kernel version!! by typing $uname-a );
   • $ sudo apt-get install gcc
5. configure it
   $ sudo aticonfig –initial
6. restart X server (by pressing CTRL + ALT + BKSP)

In short: follow those steps:

sudo apt-get install xserver-xgl
wget https://a248.e.akamai.net/f/674/9206/0/www2.ati.com/drivers/linux/ati-driver-installer-8-11-x86.x86_64.run
sudo sh ati-driver-installer-8-10-x86.x86_64.run
sudo aticonfig –initial


Commands to check if it is well installed:

me@gos:~$ glxinfo | grep direct
direct rendering: Yes

me@gos:~$ fglrxinfo
display: :0.0 screen: 0
OpenGL vendor string: ATI Technologies Inc.
OpenGL renderer string: Radeon X1300/X1550 Series
OpenGL version string: 2.1.8087 Release



Troubleshooting: startx X don't start

in case X server don't start, check the messages in the console after the $startx command.
It will explain you the reason.
In many cases, instead of loosing time, it may be a LOT EASYER to just remove the xorg.conf file.
$ rm /etc/X11/xorg.conf
and let startx use a default config:
$ startx
at this point, take a look inside the file /var/log/Xorg.0.log
you will find some lines similar to those of the xorg.conf syntax.
Finally: copy those lines in a new xorg.cong file and run startx. It should work.


Troubleshooting: Unable to find any supported Screen sections

Your /etc/X11/xorg.conf file has something wrong with the line:

Section “Screen”

or

Section "ServerLayout"
Screen [...]

File example for xorg.conf with ATI drivers:

Section "ServerLayout"
Identifier "Builtin Default Layout"
Screen 0 "aticonfig-Screen[0]-0" 0 0
EndSection

Section "Files"
EndSection

Section "Module"
Load "extmod"
Load "dbe"
Load "glx"
Load "freetype"
Load "record"
Load "dri"
EndSection

Section "InputDevice"
Identifier "Generic Keyboard"
Driver "keyboard"
Option "CoreKeyboard"
Option "XkbRules" "xorg"
Option "XkbModel" "pc104"
# !!! set your keyborad layout here !!!
Option "XkbLayout" "us"
EndSection

Section "InputDevice"
Identifier "Configured Mouse"
Driver "mouse"
Option "CorePointer"
Option "Device" "/dev/input/mice"
Option "Protocol" "ImPS/2"
Option "Emulate3Buttons" "true"
Option "ZAxisMapping" "4 5"
EndSection

Section "Monitor"
Identifier "Builtin Default Monitor"
EndSection

Section "Monitor"
Identifier "aticonfig-Monitor[0]-0"
Option "VendorName" "ATI Proprietary Driver"
Option "ModelName" "Generic Autodetecting Monitor"
Option "DPMS" "true"
EndSection

Section "Device"
Identifier "Builtin Default ati Device 0"
Driver "ati"
EndSection

Section "Device"
Identifier "aticonfig-Device[0]-0"
Driver "fglrx"
BusID "PCI:1:0:0"
EndSection

Section "Screen"
Identifier "Builtin Default ati Screen 0"
Device "Builtin Default ati Device 0"
Monitor "Builtin Default Monitor"
EndSection

Section "Screen"
Identifier "aticonfig-Screen[0]-0"
Device "aticonfig-Device[0]-0"
Monitor "aticonfig-Monitor[0]-0"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
EndSubSection
EndSection

Troubleshooting: Unable to find fglrx

If receiving many error messages with STARTX or compiling the ATI DRIVERS ...
even in the case you already installed the fglrx,

then it may be necessary to cleanup you system a little bit:

sudo apt-get update
sudo apt-get upgrade
sudo apt-get autoclean
sudo apt-get clean

then try running again the 1st script (reinstall the ATI drivers, run ATICONFIG ... and so on)