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[Andrew J Lea <andrew.j.lea@xxxxxxxxx>]

I am having this same problem and have been chasing the solution for a while.  I have an RS690M chip in an intergrated X1200 card in my Toshiba Satellite A215 with TurionX2 64 chipset.
I tried, in order:
sudo gedit /etc/X11/xorg.conf
and added the following line under the Section "Device":
Option "AccelMethod" "XAA"

This virtually eliminated flickering, but it also eliminated the use of
skype and cheese and other webcam-streaming apps, so I returned to the
default xorg.conf configuration.

So then I tried the updated:
 xserver-xorg-video-ati - 1:6.12.99    and    xserver-xorg-video-radeon - 1:6.12.99 
many people listed it as the fix for thier machines, but when it booted, I had a really fuzzy, bloated display that looked like it was 600x800 resolution, but no flickering.  I would like to try it again and see if there is a way I can change resolution to match my screen (1280x800), becaue this seems like the best driver yet, no flicker at all.

So I returned to the Jaunty default:
 xserver-xorg-video-ati - 1:6.12.2    and    xserver-xorg-video-radeon - 1:6.12.2 
and everything worked just as with the original install.  

Then I installed just the radeonhd 1.2.5  .deb package files, but
without the full ubuntu-recommended installation guide
(https://help.ubuntu.com/community/RadeonHD), just did a double click
.deb package install.  This changed nothing that I could tell, so I
entered xorg.conf again and pointed it towards the radeonhd driver....
still can't tell a difference.  lots of flicker, but still have skype
and cheese webcam stream, just like the default.  I am going through the
steps to try the manual install of the radeonhd driver, but my hopes
aren't very high.  One question on this: do I need to purge the default
radeon and ati 1:6.12.2

Any other suggestions on combinations of packages or advice on changing
the resolution with the 1:6.12.99 package or something I may have
missed?

-- 
[RS690M] screen flickers when CPU is at low frequency
https://bugs.launchpad.net/bugs/351291
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