[Bug 591963] [NEW] [Needs AGPMode quirk] X freeze + font corruption on Radeon 9600

[Jere Kupari]

Public bug reported:

Since gutsy I've had 
   Option "BusType" "PCI"
in my xorg.conf, because my X would otherwise freeze in minutes.

Now, after updating to lucid, the freeze was fixed, but fonts would
corrupt. Sometimes a glyph would turn into something resembling a pause-
symbol (play/pause double bar). Sometimes the glyph would just disappear
and turn to white space. And some colours changed, e.g. everything
written in black could turn bright green. OpenGL was also affected,
Emilia Pinball would be dark and garbled.

Then I found https://wiki.ubuntu.com/X/KernelModeSetting  After disabling KMS with 
   options radeon modeset=0
in /etc/modprobe.d/radeon-kms.conf I had the freeze issue again, and some (but not all) corruption problems got fixed. 

It seems that wrong AGPmode was the reason for all these problems, here
is the information asked in https://wiki.ubuntu.com/X/Quirks

 AGPMode needed: 4
  Model:          Abit AV8
  Host Bridge:   VIA Technologies, Inc. K8T800Pro Host Bridge [1106:0282]
  Graphics Card: ATI Technologies Inc RV350 AP [Radeon 9600][1002:4150]
  Card Subsystem: PC Partner Limited Device [174b:7c20]
  HW changes:     (No)
  BIOS:           (Unknown)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: xorg-needs-kernel-fix

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[Needs AGPMode quirk] X freeze + font corruption on Radeon 9600
https://bugs.launchpad.net/bugs/591963
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