Radeon Mobility 7500 under Jaunty

Update 2: On a clean install of Karmic Beta, this was fixed out of the box.

Update: The config below results in some stability issues on my machine. It might be isolated and it might not be. But for me it triggers random restarts once a day or so and a reproducible restart when I try to run

cvs -z3 -d:pserver:anonymous@tinyos.cvs.sourceforge.net:/cvsroot/tinyos co -P tinyos-2.x

which really doesn’t make sense. I have reverted to this xorg.conf (which is slow) and hope for the best in Karmic …

Original post:

Since the arrival of Jaunty Jackelope (Ubuntu 9.04) my laptop has performed miserably on the 2D side of things. It’s an IBM ThinkPad T42 2379-R4U. Thats an ATI Radeon Mobility 7500 with 32MB and a 1400×1050 screen.

Today I found this page and as a result my /etc/X11/xorg.conf now contains this device section:

Section "Device"
Identifier "Configured Video Device"
Option "AGPMode" "4"
Option "AGPFastWrite" "True"
Option "EnablePageFlip" "True"
Option "AGPMode" "4"
Option "AGPSize" "64"
Option "RingSize" "8"
Option "BufferSize" "2"
Option "EnableDepthMoves" "true"
Option "RenderAccel" "true"
# Eyecandy Stuff
Option "AccelMethod" "XAA"
Option "EnablePageFlip" "true
Option "DDCMode"
Option "SubPixelOrder" "NONE"
Option "ColorTiling" "false"
Option "MigrationHeuristic" "greedy"

This gives me decent, but not great, performance.


Tags: , , , , , ,

4 Responses to “Radeon Mobility 7500 under Jaunty”

  1. Marco Says:


    i have a laptop Dell Latitude C640. Thats an ATI Radeon Mobility 7500 with 32MB and a 1400×1050 screen. Like your laptop. Howewer i can’t activate this resolution and i get only 1024×780. Could you post please your xorg.conf so can i maybe understand?
    Thanx in advance!

    • aslakjohansen Says:

      Strangeness follows … I can’t explain the resolution issue. It’s not even the right aspect ratio! 1024×768 would have been the right ratio, but would still be strange.

      In the good-old-days ™ setting up X was relatively simple, 10min and then the stuff worked. Today this process is automated and it is pretty unclear how to override manually when it doesn’t work. Then again it might be a hardware issue.

      My current (and slow) xorg.conf. Good luck!

  2. Marco Says:

    i found this and i followed the instructions but only result was that windows manager erased all the window behaviors (borders?). (excuse my horrible english)

    • aslakjohansen Says:

      You might want to try turning off desktop effects in the Visual Effects of the System > Preferences > Appearance dialog.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: