[SOLVED] Very poor video frame rate after upgrade

I'm relatively new to Arch, having been a Slackware user for many years (since Slack 3.5), so please treat me gently!!
I installed Arch about a month ago from the network and had everything running well, including Firefox 4.0. Today when I started the PC and ran Firefox, I received a message recommending that I install Firefox 4.0.1. I duly downloaded the Arch package for FF 4.0.1, but it wouldn't run, complaining that it couldn't load XPCOM. I searched through the Arch forums and found a suggestion to run Pacman -Syu to upgrade the system. This upgraded around 140 packages, including quite a few Xorg ones.
Now I find that watching any sort of video in Xorg (e.g., The BBC weather forecast in Firefox or BBC Iplayer, or even glxgears), the frame rate particularly at full-screen is abysmal, dropping as low as around 2 (two!) frames per second. Glxgears manages around 9 frames per second. Before today's system upgrade, glxgears achieved exactly 60 frames per second at any screen size and BBC video was smooth at full-screen.
I'm guessing that the problem is somewhere in an upgraded Xorg package, but I'm completely in the dark as to where to start looking. There are no obvious problems reported in /var/log/Xorg.0.log. I could post the content of this file if required, but it's huge and would make an extremely long post.
Please could someone offer me some guidance on where to start looking for the problem and how to fix it. The hardware I'm running on is Asrock 890FX deluxe 3 motherboard, Phenom-II 955 CPU, Asus 1Gb Radeon HD5570 video card. 'uname -a' reports that the kernel is 2.6.38-ARCH.
I hope I've posted this in the right forum. If not, please advise accordingly!
Thanks in advance for any clues!
Gerald.
Last edited by edenyard (2011-05-18 13:25:39)

The files in your /etc/X11/xorg.conf.d folder are the standard ones, so they should not be the problem.
I've looked in your xorg.log, and while the problem is not clear immediately, you got several (WW) and (EE) messages in it.
[ 27.795] (WW) The directory "/usr/share/fonts/OTF/" does not exist.
[ 27.795] Entry deleted from font path.
[ 27.836] (WW) `fonts.dir' not found (or not valid) in "/usr/share/fonts/75dpi/".
[ 27.836] Entry deleted from font path.
[ 27.836] (Run 'mkfontdir' on "/usr/share/fonts/75dpi/").
these are safe to ignore
[ 27.837] (WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory)
without acpid installed, your monitor probably won't be blanked when you're system is inactive for a while, but otherwise this should not be a problems.
(EE) Failed to load module "vesa" (module does not exist, 0)
(EE) Failed to load module "fbdev" (module does not exist, 0)
vesa and fbdev are intended as fallback options, it's better to install them.
pacman -Syu xf86-video-fbdev xf86-video-vesa
[ 27.935] (WW) xf86OpenConsole: setpgid failed: Operation not permitted
[ 27.935] (WW) xf86OpenConsole: setsid failed: Operation not permitted
These lines may have to do with your problem, but i don't know what they mean.
we need more info.
run gxlinfo , and post the output from top until the line with OpenGL extensions:
Last edited by Lone_Wolf (2011-05-14 10:09:11)

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[SOLVED] Very poor video frame rate after upgrade

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