Computer fail to wake without computer sleep

[zillac]

I know the title is a bit awkward, but the problem I'm having is NOT that the screen won't wake up after Computer sleep, and is is NOT computer wont' wake up after sleep either.

 

In Energy Saver panel, computer sleep is set to never, screen sleep to 10min, "put hard drive to sleep when possible" and "allow power button to put computer to sleep" both checked. It is set this way so the computer will stay running while i'm asleep.

 

However, sometimes in the morning, the screen will not come back up when I move/click the mouse and/or keyboard. It stays blank, and the computer doesn't seem to be "running" except for the fact it's on, the fans are all spinning: when I check the system log (after a hard reset of the computer to get it back on), usually Chrome will be producing tons of error message, but if I'm experiencing this problem then the system log also stops at some point during the night. In other words, the computer seems to have stopped when it's not doing anything for some reason I have not been able to pinpoint.

 

I have not been able to reproduce the exact problem. I've tried setting screen sleep and hard drive sleep to 1min, and see if it will fail to wake up, but it wakes up every time. And I've never experienced the same issue when I'm using the computer, in other words, it never stuck or become in-responsive when I'm using it.

 

hardware specs:

Gigabyte H55N-USB3

CPU Core i5 750

Mushkin 2x4GB

Gigabyte 9800GT Silent cell

Western Digital Black 640GB

 

Installed with Tonymac's UserDSDT + VoodooHDA 2.56 + iMac11,1 + Lnx2Mac's beta RealtekRTL81xx.kext

 

Any help is greatly appreciated.

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10/30/10 12:37:46 AM	kernel	[en0:R1000TxInterrupt] R1000TxInterrupt cleaned up 2 Tx packets
10/30/10 12:37:46 AM	kernel	[en0:R1000TxInterrupt] R1000TxInterrupt cleaned up 2 Tx packets
10/30/10 9:15:14 AM	kernel	npvhash=4095
10/30/10 9:15:14 AM	kernel	Darwin Kernel Version 10.4.0: Fri Apr 23 18:27:12 PDT 2010; root:xnu-1504.7.4~1/RELEASE_X86_64

 

log file looks like this. you can see the gap between 12:37AM - 9:15AM.