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October 15, 2003

Yes, you will notice the missing 333 mhz

MacMegasite - 10.2.8 Reducing Processor Speed?

I had this happen to me. I thought it was odd that I was maxing the processor so frequently, and that the 500-megahertz TiBook seemed almost as fast as the miniBook.

The page above suggests that a PRAM reset (Command-Option-P-R on startup) will straighten everything out, but that wasn't enough on my PowerBook. I had to also reset the Power Management Unit: With the machine off, press and release Shift-Control-Option-Power On at the same time. Nothing will happen, but wait at least 5 seconds. Power up, and check that you're back to normal.

You can verify that you're fixed with Xbench, or with the shell command 'sysctl hw.cpufrequency'.

Update: I rebooted today after installing QuickTime 6.4 and iTunes 4.1, and afterward, my CPU frequency was back at 533 mhz. Resetting the PMU (and only the PMU) straightened it out.

October 15, 2003 in Apple - PowerBooks | Permalink


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I posted this tip to the Mac users group mailing list at UW and it helped a couple of people. There were some concerns that 10.2.8 was not QA-ed at all, with Panther right around the corner. Dunno about that, but then I'm not a laptop user, the group most affected by this. My angst might be more keen if I were.

Posted by: paul at Oct 17, 2003 11:55:16 PM