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I have HD 4850 card, Ubuntu 12.10 and installed legacy drivers using makson96 ppa. The issue is, that FGLRX can not detect my device and loads vesa bios. I had the same problem on ubuntu 11.10, 12.04 versions. I want to manually help fglrx find a matching device to load as it shoudld do.

It is interesting, why does fglrx search for a device in a PCI:0@1:0:1 Bus? in xorg.cof different bus is indicated:

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


fglrxinfo
display: :0.0  screen: 0
OpenGL vendor string: Advanced Micro Devices, Inc.
OpenGL renderer string: ATI Radeon HD 4800 Series         
OpenGL version string: 3.3.11653 Compatibility Profile Context

Here is a part of my xorg log: 

[     3.846] (II) VESA: driver for VESA chipsets: vesa
[     3.846] (II) FBDEV: driver for framebuffer: fbdev
[     3.846] (++) using VT number 7

[     3.846] (WW) Falling back to old probe method for fglrx
[     3.883] (II) Loading PCS database from /etc/ati/amdpcsdb
[     3.883] (--) Assigning device section with no busID to primary device
[     3.883] (--) Chipset Supported AMD Graphics Processor (0x9442) found
[     3.884] (WW) fglrx: No matching Device section for instance (BusID PCI:0@1:0:1) found
[     3.884] (II) AMD Video driver is running on a device belonging to a group targeted for this release
[     3.884] (II) AMD Video driver is signed
[     3.884] (II) fglrx(0): pEnt->device->identifier=0xb7791d8f
[     3.884] (WW) Falling back to old probe method for vesa
[     3.884] (WW) Falling back to old probe method for fbdev

from lispci i foud out finally, that my video card is in 01:00.0 slot. logically, if fglrx searches for a vdeo card device in a wrong place, it will not find it.

01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI RV770 [Radeon HD 4850]

The log also says:

(WW) fglrx(0): board is an unknown third party board, chipset is supported Thanks in advance.

Lejo
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  • I am a novice user. Through i had research on this problem, could not find a solution. I tried a nomodeset mode, reinstalled drivers numerous of times from many tutorials, have tried ubuntu 11.10 and 12.04, i have downgraded bootloader, but still fiasco. – Lejo Dec 10 '12 at 22:50
  • See http://askubuntu.com/questions/176760/should-i-install-the-fglrx-drivers-or-stick-with-radeon-ubuntu-12-04-radeon – user68186 Dec 11 '12 at 17:15

2 Answers2

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I had the exact same card, 4850 and I found that fglrx even when configured properly takes up too much resources for the card. The best performance is shown when using the opensource driver. Do

sudo amdconfig --uninstall

and stick to the opensource driver is my suggestion as a user of that card for 3 years on Linux.

Eric Carvalho
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Nick Bailuc
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You could try this:

sudo -i

and then this

gedit /etc/org/xorg.conf

and then alter this

pci:01:00.0

and then this

sudo apt-get purge fglrx

and then this

sudo apt-get install fglrx*-

and it might work fine this way.

Michael
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