Bug#433677: xserver-xorg-video-ati: Massive performance reduction from etch to lenny on radeon 9250

[Andrew Chant <andrew.chant+debian@gmail.com>]

Package: xserver-xorg-video-ati
Version: 1:6.6.3-2
Severity: important


Under Etch, iceweasel is fast on X server with EXA.
After upgrade to Lenny, running iceweasel makes the X display
unresponsive (1-2 second lag ).  I'm often unable to drag windows
around the screen as the window just ignores the input.  CPU usage 
by Xorg maxes out.

I know this is a problem with the X server not iceweasel because I ran 
etch under chroot and etch's iceweasel had the same laggy/CPU-hogging response.

Radeon 9250, 1920x1200x24bpp

xorg.conf attached.
-Andrew


-- System Information:
Debian Release: lenny/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.21-2-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages xserver-xorg-video-ati depends on:
ii  libc6                   2.6-2            GNU C Library: Shared libraries
ii  xserver-xorg-core       2:1.3.0.0.dfsg-6 X.Org X server -- core server

xserver-xorg-video-ati recommends no packages.

-- no debconf information

# xorg.conf (xorg 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 "Files"
EndSection

Section "InputDevice"
	Identifier	"Generic Keyboard"
	Driver		"kbd"
	Option		"CoreKeyboard"
	Option		"XkbRules"	"xorg"
	Option		"XkbModel"	"pc104"
	Option		"XkbLayout"	"us"
EndSection

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ImPS/2"
	Option		"Emulate3Buttons"	"true"
EndSection

Section "Device"
	Identifier	"Generic Video Card"
	Driver		"ati"
	Option		"AccelMethod"		"EXA"
EndSection

Section "Monitor"
	Identifier	"Generic Monitor"
	Option		"DPMS"
	HorizSync	28-96
	VertRefresh	43-60
EndSection

Section "Screen"
	Identifier	"Default Screen"
	Device		"Generic Video Card"
	Monitor		"Generic Monitor"
	DefaultDepth	24
	SubSection "Display"
		Modes		"1920x1200"
	EndSubSection
EndSection

Section "ServerLayout"
	Identifier	"Default Layout"
	Screen		"Default Screen"
	InputDevice	"Generic Keyboard"
	InputDevice	"Configured Mouse"
EndSection