Red Hat Bugzilla – Bug 487017
kernel-126.96.36.199-170.2.24.fc10.i686 causes graphical performance issues and glitches using the radeon driver
Last modified: 2009-12-18 03:01:26 EST
Description of problem:
Booting into the latest kernel causes abysmal graphical performance using the radeon driver when compared to kernel-188.8.131.52-170.2.5.fc10.i686. It also exhibits at least one visual glitch: the icons in the systray in kde don't render, but you can interact with them. You can see black spaces where your pidgin, battery monitor, NetworkManager icons should be, you can interact with them normally once you figure out which one is which.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. boot into kernel-184.108.40.206-170.2.24.fc10.i686
2. notice high X cpu utilization, very very sluggish performance
3. notice no visible icons in the system tray
performance comparable to kernel-220.127.116.11-170.2.5.fc10.i686
My kernel is not tainted, I am not using any binary drivers.
I do not understand how switching back and forth between kernels could affect performance. I am using identical kernel options to boot between the kernels, my xorg.conf is not changing. The output from Xorg is different, specifically when booting into the most recent kernel it loads vgahw and int10 modules. I will try to attach dmesg and Xorg.0.log from the old kernel and the latest.
Created attachment 332953 [details]
dmesg from 18.104.22.168-170.2.5.fc10.i686 (normal performance)
Created attachment 332954 [details]
dmesg from 22.214.171.124-170.2.24.fc10.i686 (poor performance)
Created attachment 332955 [details]
xorg log from 126.96.36.199-170.2.5.fc10.i686 (normal performance)
Created attachment 332956 [details]
xorg log from 188.8.131.52-170.2.24.fc10 (poor performance)
Also, rhgb on the new kernel (184.108.40.206-170.2.24.fc10) does not work (that is, I get the text bar crawling across the screen, not the actual graphical boot) whereas it works on 220.127.116.11-170.2.5.fc10.i686. I have a feeling this isn't a kernel bug but instead has to do with the initrd which subsequently influences what Xorg can do. Still, I have no idea what I would need to do differently to make the initrd "right". I tried regenerating the initrd using mkinitrd for the 18.104.22.168-170.2.24.fc10 kernel and there was no difference in performance or modules loaded.
Can you test with fedora 12 livecd and report if it works with it.
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