Saturday, May 3, 2008

Ubuntu or Kubuntu on a IBM Thinkpad T21 or T22 Video Driver Fix

I recently upgraded to Ubuntu 8.04 Hardy Heron and experienced problems with Xorg and my savage video card.  Traced it back to the AGPSize and AGPMode options for the savage driver.  Now have working 3D acceleration aka DRI and AIGLX.  I've been missing that since the upgrade to version 7.xx.  Turns out AGPSize defaults to a 16MB window which causes a lockup or failure on my IBM Thinkpad T21 and T22 with acceleration turned on.  The Thinkpads have only 8MB video ram.

FYI I actually use Kubuntu but I upgraded all my Kubuntu systems just fine using the Ubuntu CD.

The working, 3D accelerated xorg.conf from my IBM Thinkpad T22:

# xorg.conf (X.Org X Window System server configuration file)
# This file was generated by dexconf, the Debian X Configuration tool, using
# values from the debconf database.
# Edit this file with caution, and see the xorg.conf manual page.
# (Type "man xorg.conf" at the shell prompt.)
# This file is automatically updated on xserver-xorg package upgrades *only*
# if it has not been modified since the last upgrade of the xserver-xorg
# package.
# If you have edited this file but would like it to be automatically updated
# again, run the following command:
#   sudo dpkg-reconfigure -phigh xserver-xorg

Section "InputDevice"
    Identifier    "Generic Keyboard"
    Driver        "kbd"
    Option        "XkbRules"    "xorg"
    Option        "XkbModel"    "pc101"
    Option        "XkbLayout"    "us"
    Option        "XkbOptions"    "lv3:ralt_switch"

Section "InputDevice"
    Identifier    "Configured Mouse"
    Driver        "mouse"
    Option        "CorePointer"
    Option        "EmulateWheel"        "true"
    Option        "EmulateWheelButton"    "2"
    Option        "ZAxisMapping"        "4 5 8 9"

Section "InputDevice"
    Identifier    "Synaptics Touchpad"
    Driver        "synaptics"
    Option        "SendCoreEvents"    "true"
    Option        "Device"        "/dev/psaux"
    Option        "Protocol"        "auto-dev"
    Option        "HorizEdgeScroll"    "0"

Section "Device"
    Identifier    "Configured Video Device"
    Option        "AGPMode"        "2"
    Option        "AGPSize"        "8"
    #Option        "ShadowStatus"        "true"
    #Option        "ShadowFB"        "true"
    #Option        "NoAccel"        "true"

Section "Monitor"
    Identifier    "Configured Monitor"

Section "Screen"
    Identifier    "Default Screen"
    Monitor        "Configured Monitor"
    Device        "Configured Video Device"
    DefaultDepth    16

Section "ServerLayout"
    Identifier    "Default Layout"
    Screen        "Default Screen"
    #InputDevice    "Synaptics Touchpad"

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Ed said...

Thank you so much! Just got the video card properly configured in my T21 after months of pain thanks to you :-)

freegnu said...

FYI I figured it out by reading through /var/log/Xorg.0.log after a failure and comparing the detected and configured values to the real values according to lspci and the technical specification for the laptop and reading a lot of man pages starting at Xserver.

john said...

I really love you!
Hours and hours of troubles and now it works like a charm! thak you!!!


Preczer said...

Hi i'm using T22 with Ubuntu 10.10 I tried your xorg.conf but it doesnt't work. When I run glxgears it reboots my X server. If you have any idea how to modify the xorg.config please let me know.

Thank you in advance.