Archived thread 1000200 from Desktop Environments. Markdown source: Desktop_Environments/thread_1000200_Downgrading_ATi_FGLRX_driver.md
This driver is required to fully utilise the 3D potential of some ATI graphics cards, as well as provide 2D acceleration of newer cards.http://img505.imageshack.us/img505/1954/screenshothardwaredrivexz3.png
Ubuntu 8.10 - ATI Sapphire 1650 PRO 512 MB
I didn't install this but if i will and after reboot it gives a error about x.org server, how can i make the downgrade to what it was :confused::-s
I just went through this tonight - I built a new super workstation last night (ASUS Rampage II Extreme mobo, 12GB RAM, an Intel Core i7 2.94GHz CPU (seen as an 8 CPU 47037.85 BogoMIPS system), dual Radeon HD4850 dual DVI video cards, 3Ware 9650SE with a 6 250GB SATA II RAID array), and installed Intrepid Ibex on it today. Everything was great until I "upgraded" to the proprietary AMD/ATI FGLRX drivers for my dual Radeon HD4850 video cards and *poof* no more X windows. I kept getting failures like no device at PCI location.
Even running the failsafe 'dpkg-reconfigure -phigh xserver-xorg' wouldn't recover it until I did the following:
I downgraded the fglrx driver (removed it) by doing the following:
Heavy-handed deletion of the fglrx module
Remove the artefacts (which is the actual cause of the inability to run X) from modules.alias: edit /lib/modules/2.6.27-9-generic/modules.alias and remove all lines ending with 'fglrx' - there were quite a few of them in my modules.alias file and they were all at the very end of the file.
Reboot
When Intrepid rebooted, the failsafe X recovery worked like a charm and *voila* I had X again.
So much for those damn proprietary drivers, regardless of how well intentioned the support may be.
YMMV
I have found a number of fixes for the problem of the ATI FGLRX Xserver issue.
My fix was to install the proprietary ATI/AMD FGLRX drivers and update my /etc/X11/xorg.conf file to the following:
Section "ServerLayout" Identifier "amdcccle Layout" Screen 0 "Default Screen" 0 0 EndSection
Section "Files" EndSection
Section "Module" Load "glx" EndSection
Section "Monitor" Identifier "Configured Monitor" EndSection
Section "Device" Identifier "Configured Video Device" Driver "fglrx" Option "EnableMonitor" "crt1,lvds,tv,tmds1,crt2,tmds2,cv,tmds2i" BusID "PCI:2:0:0" EndSection
Section "Screen" Identifier "Default Screen" Device "Configured Video Device" Monitor "Configured Monitor" DefaultDepth 24 EndSection
I have an ATI HD4850 card in PCIbus 2:0:0.
There are certain combinations of x86_64, mainboards, and ATI cards when using 4+GB of RAM that require you to manually configure the MTRRs on your system.
See http://ubuntuforums.org/showthread.php?p=6364262#post6364262 for details
