The problem is when the screen saver sends the command "poweroff" to the graphic card, the monitor continuously power off, and on, and off, and on, and ... I have an ATI/AMD Radeon HD 6950, Arch Linux (x64), Gnome 3.2.0, xorg-server 11.1.1, xf86-video-ati 6.14.2-2 I don't have this problem with Catalyst closed source driver.
*** This bug has been marked as a duplicate of bug 40851 ***
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