I was having poor video performance affecting: screen redraws, text
entry in web browsers, desktop switching, window switching/selection,
and much more. My laptop felt like it was filled with glue ;)
I'm running a Sharp MM-20 (yes it's old!). dmesg reports my video chipset as:
VGA compatible controller: ATI Technologies Inc Radeon Mobility M6 LY
My 9.04 install was performed clean from the 9.04 Alternate Install CD
(not upgraded).
No xorg.conf file was created by default, so in order to apply the changes
referenced in the original bug report, I had to manually create an xorg.conf
file. So I created a "bare bones" config file.
contents of my /etc/X11/xorg.conf:
Section "Device"
Identifier "ATI Radeon"
Driver "ati"
Option "AccelMethod" "EXA"
Option "MigrationHeuristic" "greedy"
Option "AccelDFS" "true"
Option "EnablePageFlip" "true"
Option "EnableDepthMoves" "true"
EndSection
This resulted in much snappier redraws and better overall video
performance. I also noticed CPU consumed by X drop from around 20-30%
down to 5% after the change.
I recommend that this be investigated further. Also, it may be prudent
to have an xorg.conf file created by default for systems with this video
chipset. I sense that by not having an xorg.conf, we are exposing a lot
of users to "floating" settings and possible performance issues.
--
scrolling (and other effects) extremely slow
https://bugs.launchpad.net/bugs/370441
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