Installed 10.5.8 iMac now reboots to full brightness

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Installed 10.5.8 iMac now reboots to full brightness

So I just installed the 10.5.8 update on my Late 2006 iMac, and when I restart the machine the display defaults to full eye-popping brightness. I have to manually turn it back down each and every time (fun!).

Anyone else have this obvious problem?

iMac (Late 2006), Mac OS X (10.5.7), 10.5.8

Posted on Aug 5, 2009 3:32 PM

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Answer 1

Aug 5, 2009 3:51 PM in response to Matt Morano

Hi Matt M;

On the 10.5.8 update, I didn't have any problems.

In the past I have notices some of the System Preferences to be different after the update on either my PM G5 Quad or my MBP. I didn't think much of these problems and simply reset them back to where I wanted them.

Allan

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Answer 2

V.K.

Level 9

56,174 points

Aug 5, 2009 3:54 PM in response to Matt Morano

do you mean this happens on every subsequent restart?
then reset PRAM
http://support.apple.com/kb/HT1379

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Answer 3

Matt Morano Author

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10 points

Aug 5, 2009 4:35 PM in response to V.K.

V.K. wrote:
do you mean this happens on every subsequent restart?
then reset PRAM
http://support.apple.com/kb/HT1379

Yeah, that's what I meant. After every subsequent restart.

I hate to say it, though, but that didn't work.

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Answer 4

Aug 5, 2009 5:07 PM in response to Matt Morano

Hi everyone,

I have the exact same problem !
I've resetted the pram and SMC, but it didn't work.
The brightness is always back with full intensity after restarting !

Since Mac OS 10.5.7 is installed on my iMac, bluetooth is instable too after rebooting. It sometimes disappear from my OS (pref pane and everywhere else) and reappear after restarting the computer ! Maybe it's related. Hardware, drivers, software problems for old Mac-intel after many updates...

Tom

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Answer 5

theigloo

Level 1

4 points

Aug 5, 2009 6:49 PM in response to Thomas Besse

Same here, funny you would think apple would test the update before release.
quite bizzarrr

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Answer 6

Aug 5, 2009 7:07 PM in response to Matt Morano

Yep! Full brightness!! Not good!

Update: A reboot does keep it where I left it though so Full Brightness after the Update to 10.5.8 but changing it holds after. Whew!!

Message was edited by: David Farah

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Answer 7

Aug 6, 2009 7:08 AM in response to Matt Morano

Firstly, reset the PRAM: Turn off the computer, turn the computer on and immediately press the Option-Apple-P-R combination. Then, after launching OS X, set the brightness to the required level and turn off the computer. Then unplug the power cord from electricity for 10 seconds. After all that, it should be ok - at least it helped to solve the brightness problem on my iMac (late 2006).

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Answer 8

Polansky

Level 1

10 points

Aug 6, 2009 9:05 AM in response to petermacik

Unfortunately I have the same problem as described above.
However resetting the pram and the solution mentioned above didn't work for me.

My iMac is the aluminium iMac of august 2007.

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Answer 9

Aug 6, 2009 9:15 AM in response to Matt Morano

I have the same issue as well with iMac only. Mac Pro and Macbook work just fine. Resetting PRAM and SMC did not resolve the issue.

It started with update to 10.5.8. I also notice that the shutdown on iMac is really fast (like 1 second fast). My Mac Pro and Macbook take couple of seconds longer and they have the black spinner on shutdown, like they are actually saving settings before shutdown unlike the iMac.

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Answer 10

Matt Morano Author

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10 points

Aug 6, 2009 9:49 AM in response to petermacik

Didn't work, unfortunately. It was also reported on the MacRumors and AppleInsider forums, too. I wonder if it'd be worth it to do a clean install and try the combo update...

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Answer 11

Aug 6, 2009 9:55 AM in response to Matt Morano

That's pretty drastic. Re-installing the OS is absolutely the last resort when things don't really work, and you have serious problem. I wouldn't do it, unless of course you have a clone of your OS before the update. In that case sure.

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Answer 12

Polansky

Level 1

10 points

Aug 6, 2009 12:27 PM in response to MarioGrgic

The problem seems to be related with the early aluminium iMacs and the aluminium keyboard!

I have found a temporary workaround that works for me although I am not happy with it.

Try setting your brightness 1 stroke above the lowest setting and restart your iMac. You will see that your iMac will remember this setting. Now you can recalibrate your monitor as you were used to.

Hope Apple will fix this software glitch asap!

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Answer 13

Matt Morano Author

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10 points

Aug 6, 2009 12:43 PM in response to Polansky

Polansky wrote:
The problem seems to be related with the early aluminium iMacs and the aluminium keyboard!

I have found a temporary workaround that works for me although I am not happy with it.

Try setting your brightness 1 stroke above the lowest setting and restart your iMac. You will see that your iMac will remember this setting. Now you can recalibrate your monitor as you were used to.

Hope Apple will fix this software glitch asap!

Yes! That workaround definitely does work. Though I'm not on an aluminum iMac, I use the last 20" iMac before the fancy aluminum's were introduced.

Thank you very much. Hopefully others will do the same until Apple fixes it.

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Answer 14

kachen

Level 1

4 points

Aug 6, 2009 1:29 PM in response to Polansky

YES!... Thanks a lot, Polansky for your trick. It just works!!! 🙂

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Answer 15

Aug 6, 2009 5:48 PM in response to kachen

Same here. Thank you, Polansky!

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