Red Hat Bugzilla – Bug 439853
ATI driver update has serious performance regression
Last modified: 2009-01-09 02:45:01 EST
Description of problem:
performance regression in ATI driver causes extremely slow scrolling in apps
such as Firefox
Version-Release number of selected component (if applicable):
and attempt to scroll up and down through the list. The display cannot keep
up with the scrolling and CPU meter will peg.
Using Firefox 184.108.40.206 as latest FC8 update.
Reconfigure X to use VESA driver instead of ATI and problem goes away.
Scrolling is smooth and keeps up.
Problem exists on desktop system with Sapphire X550 and on two laptops
both Dell 600m, with Radeon RV250 [Mobility FireGL 9000]. A third laptop,
Dell Vostro 1500 with
Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller exhibits
no such problem. All systems running latest updated FC8 as of 3/31/08.
Scrolling and other graphics performance has regressed with latest ATI
Didn't expect huge performance regression
Also tried ATI proprietary driver from their website and found same performance
problem. Appears to be common defect between the two. Best performance now
found with VESA driver for ATI cards. Not good.
It cannot be a common problem with proprietary driver, because we don't share
ANY code with them. Please attach your X server config file (/etc/X11/xorg.conf)
and X server log file (/var/log/Xorg.*.log) to the bug report as individual
uncompressed file attachments using the bugzilla file attachment link below.
Could you please also try to run without any /etc/X11/xorg.conf whatsoever and
let X11 autodetect your display and video card? Attach to this bug
/var/log/Xorg.0.log from this attempt as well, please.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
Created attachment 300242 [details]
xorg.conf that I normally run with
Created attachment 300243 [details]
Xorg.0.log before removing /etc/X11/xorg.conf
Created attachment 300245 [details]
Xorg.0.log after removing /etc/X11/xorg.conf
It is possible this problem lies in another X11 component and not the ATI
driver however I can still vouche for the fact that using the VESA driver
instead of the ATI driver significantly improves the performance of scrolling
text in the Firefox browser window.
I however do not want to run with the VESA driver because I loose other
functionality-- such as screen blanking and monitor power down.
Additionally, I have reverted Firefox to the version 220.127.116.11 that was originally
distributed with FC8 and the problem still remains. So I do not blame Firefox
for this issue.
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