Yes, I'm quite serious. It does work.
ACPI is the kernel power control for doing things like turning off your computer when you run 'halt' or checking what the battery life is like. When it's running in the kernel, it just senses that the button has been pressed but doesn't turn off the screen. It it's not running, the BIOS shuts the screen down.
A better solution is in one of the other threads (do a search). The latest Xfree86 drivers support the 5650. You just need to grab the latest CVS of XFree86 (the source that is to become XFree-4.4) and use that.