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): xorg-x11-drv-ati-6.8.0-1.fc8 How reproducible: visit: http://www.atmel.com/dyn/products/devices.asp?family_id=607#1761 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 2.0.0.13 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. Actual results: Scrolling and other graphics performance has regressed with latest ATI driver update. Expected results: Didn't expect huge performance regression Additional info: 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 2.0.0.8 that was originally distributed with FC8 and the problem still remains. So I do not blame Firefox for this issue.
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