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[Linuxfan <timo.doma@xxxxxxxxx>]

Yes! It works. Thank you very much.

I installed Ubuntu using alternate CD an flickering/shaking was still there. 
Then I changed grub2 as you suggested and now everything works perfectly. 

I did it this way:

1. add "radeon.new_pll=0" after "quiet splash" to the file
/etc/default/grub :

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.new_pll=0"

2. run command: sudo update-grub

3. check if in your /boot/grub/grub.cfg is something like this:
linux   /boot/vmlinuz-2.6.32-17-generic root=UUID=accec70e-54ff-436b-a1f9-6f0a69411799 ro   quiet splash radeon.new_pll=0
initrd  /boot/initrd.img-2.6.32-17-generic

4. restart
------------
Before this, I tried it with the same good result right in grub2 menu (temporary way):

1. Press SHIFT during boot
2. Press "e" to edit grub2 options
3. Add radeon.new_pll=0 at the end of line "linux /boot/vml.....
4. Press Ctrl+x

-- 
[RV515] Screen is shaking few minutes after boot
https://bugs.launchpad.net/bugs/543265
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