10.6: One possible cause of 'random sleep' in Snow Leopard
Oct 20, '09 07:30:00AM • Contributed by: ghillie
Oct 20, '09 07:30:00AM • Contributed by: ghillie
Shortly after Apple issued 10.6.1, my 2009 iMac (2.93 GHz) began to randomly sleep, sometimes quite often, sometimes with hour-long intervals in between. The kernel began logging localhost kernel [0]: Previous Sleep Cause: - 101 after each incident.
None of the three Apple sources I contacted would precisely identity this error code. There was no reference to it that I could find on the internet. The standard reply I got was that errors logged with a negative sign are abnormal, which has been documented, and that although Apple's engineers were aware of it, the exact meaning was closed-source. I was told, however, that this indicated a "partial kernel-panic."
In each case I told them I had no idea what they were or weren't allowed to say, and I didn't care -- I was just trying to fix the problem. I tried every possible method of booting Snow Leopard in both 32-bit and 64-bit modes, but couldn't solve the problem. Oddly, I wasn't able to reproduce the same random sleep with a re-install of 10.5.8.
Still under warranty until May of 2010, Apple made the repair by replacing the Main Logic Board of the iMac. It was part number 661-5133, the total repair cost would have been $1100, and it took the Apple Store in University Village just under one week. So if you're experiencing odd random sleep under 10.6 but not 10.5, it seems you may have a defective logic board, and it's probably worth a service call.
None of the three Apple sources I contacted would precisely identity this error code. There was no reference to it that I could find on the internet. The standard reply I got was that errors logged with a negative sign are abnormal, which has been documented, and that although Apple's engineers were aware of it, the exact meaning was closed-source. I was told, however, that this indicated a "partial kernel-panic."
In each case I told them I had no idea what they were or weren't allowed to say, and I didn't care -- I was just trying to fix the problem. I tried every possible method of booting Snow Leopard in both 32-bit and 64-bit modes, but couldn't solve the problem. Oddly, I wasn't able to reproduce the same random sleep with a re-install of 10.5.8.
Still under warranty until May of 2010, Apple made the repair by replacing the Main Logic Board of the iMac. It was part number 661-5133, the total repair cost would have been $1100, and it took the Apple Store in University Village just under one week. So if you're experiencing odd random sleep under 10.6 but not 10.5, it seems you may have a defective logic board, and it's probably worth a service call.
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