The 9th of june, I tried to stabilize the shaking on my display of my laptop (NC8430 with an ATI X1600)
The memory option wasn't working.
So i searched some more an found the following:
1) open a terminal ( Alt-F2, xterm )
2) sudo gedit /etc/default/grub
3) add "radeon.new_pll=0" after "quiet splash"
you will now get:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash radeon.new_pll=0"
4) sudo update-grub
you can check it the update grub did its work by looking in /boot/grub/grub.cfg and seeing the line with
linux /boot/vmlinuz-2.6.32-17-generic root=UUID=accec70e-54ff-436b-a1f9-6f0a69411799 ro quiet splash radeon.new_pll=0
After a restart, the shaking is gone !
Source: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/543265