Black screen upon waking from sleep

Hello,
I have an intermittent problem with waking my entry-level MBP from sleep; on some occasions, the screen remains black instead of the system waking up and displaying the Finder.
Recently, upon waking from sleep, the authentication dialog displayed, I typed my password and pressed return, the dialog dismissed, the screen remained black, and the wait cursor displayed without spinning.
To recover, I needed to force power down and cold reboot.
system.log (in Console) contained the following entry at the time of the crash.
Aug 14 07:39:51 BF-H-MBP kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0xd = GR: SW Notify ErrorAug 14 07:39:51 BF-H-MBP kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0xd = GR: SW Notify Error
The entries surrounding the one above were as follows (the next to last one evidently was the final entry before the forced power down).
Aug 14 07:39:47 BF-H-MBP kernel[0]: IOBluetoothHCIController::restartShutdownWL this is a wake from sleep
Aug 14 07:39:47 BF-H-MBP kernel[0]: System Wake
Aug 14 07:39:47 BF-H-MBP kernel[0]: IOUSBWorkLoop::closeGate - interrupt Thread being held off
Aug 14 07:39:51 BF-H-MBP kernel[0]: NVChannel(GL): Graphics channel exception! status = 0xffff info32 = 0xd = GR: SW Notify Error
Aug 14 07:39:51 BF-H-MBP BatteryUpdater[3590]: Battery does not need the BatteryUpdate v 1.2 (0x2)
Aug 14 07:39:51 BF-H-MBP lookupd[3588]: lookupd (version 369.6) starting - Tue Aug 14 07:39:51 2007
Aug 14 07:50:08 localhost kernel[0]: hi mem tramps at 0xffe00000
Can someone diagnose the problem based upon the above Console entries?
Thanks in advance!

Hi,
Thanks for taking time to post.
My question is different than the one your posting answers.
My question is, what is the diagnosis of the problem based upon the Console log entries that I've posted (rather than "How do I recover from the black screen?")?
Cheers!

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Black screen upon waking from sleep

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