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Solved: Display will not sleep

lannister80

lannister80

macrumors 6502
Original poster
Apr 7, 2009
490
17
Chicagoland
I have a new issue with my Mac Pro (3,1 - 2008), it just popped up (and I don't think it was caused by 10.6.3, I remember this working correctly after it was installed)

I have two monitors connected via DVI to a flashed XFX 4870. The 4870 has never given me any trouble.

In the Energy Saver settings, I usually set the machine to never sleep, and the displays to sleep after 5 minutes. This used to work great, never had any trouble with it, ever. Now, the displays don't go to sleep after 5 minutes, they just stay on with a screensaver.

I tired the following:

1) Clicked "restore defaults" button in Energy Saver control panel, then set my setting the way I usually do.

2) Set a hotcorner to put the displays to sleep. This worked once or twice, then the hotcorner stopped working.

3) Rebooted a bunch of times.

I have not yet reset PRAM or SMC because this is a monitor/display sleep issue, not a machine sleep issue (machine sleeps just fine).

I have a full SuperDuper backup of my 10.6.2 system and when I boot into that, display sleep works just fine. But I could *swear* that display sleep was working OK in 10.6.3 before this issue happened. I think...

Any ideas? Can I blow away some plist files to reset this?
 
lannister80 said:
Really? Alright, I'll give it a go. Any particular error/correction I should look for in the output?
Click to expand...

Just let it repair them, then reboot and see if the display works. Seen several cases where this has done the trick. No need to look for any special correction it does
 
Well, it worked for about 1 or 2 reboots, and now they won't sleep again.

Repairing permissions sometimes helps, sometimes doesn't. Repairing permissions doesn't report anything being fixed, even when it does help.

Anyway know what the specific issue might be?
 
lannister80 said:
Well, it worked for about 1 or 2 reboots, and now they won't sleep again.

Repairing permissions sometimes helps, sometimes doesn't. Repairing permissions doesn't report anything being fixed, even when it does help.

Anyway know what the specific issue might be?
Click to expand...

Try reseting PRAM and SMC

Might be an issue in the display's drivers too
 
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