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Discussion Starter · #1 · (Edited)
Tiger screen brightness bug - is there a fix?

I've found so little information on this issue.

I was using 10.4.8 on an MDD dual 1.25 when, all of a sudden, my screen brightness control disappeared. See pic.

Also, the hotkeys (F14, F15) failed to work. ALSO, the brightness adjustment button on the frame of the monitor does nothing now.

I updated to 10.4.10 but there is no change. It's stuck in the highest setting and burning my eyes.

Help?!
 

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Discussion Starter · #7 ·
Have you tried all the standard file system repair stuff? repair permissions?
Oh yeah, of course. That's part of my regular neurotic routine.

At the moment I'm using an actual program (called... "Brightness Control") to dim the monitor, but I'm sure you can imagine how annoying it is to use a 3rd party freeware app to band-aid such a fundamental known bug.
 

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Discussion Starter · #11 ·
A call to Apple resulted in waiting for an hour on hold, then a 'circuits busy' signal.
 

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Is that an Apple Studio Display feature?

I'm on 10.4.8 and never had a brightness control in the Display preferences. The brightness control along with all the other LCD controls are built into the monitor.
 

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Discussion Starter · #14 ·
Thanks. I've been using one called (get ready...) "Brightness Control" - but I'm sure you can understand how I might be annoyed at having to use a 3rd party app. at all. I'll try Shades for fun though.

@ krs: I have a Studio Display - and the brightness control button that used to queue the monitor display preferences now does nothing at all; c.f. the F14/F15 keys.
 

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Try Onyx for a cleanup - had a similar problem with a sound control

try also reinstalling the Combo updater
 

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Discussion Starter · #16 ·
Try Onyx for a cleanup - had a similar problem with a sound control

try also reinstalling the Combo updater

Thanks for the ideas!

Onyx: cleaned/'maintained' more than just the pre-checked boxes = no change.

RE-reinstalled combo = no change.

Called Apple: $50 to 'trouble shoot over the phone' = Ahahahaha!


So.

:(
 

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This may sound dumb, but have you disconnected and reconnected the monitor cable? It could be function of signals not getting through to the machine. I'll assume you have tried logging in as another user to check this too.

Only other thing I can think of (assuming the failure occurred without any software being installed / deleted) is that there my be a chip in the monitor that has gone rendering the computer insensate to the ability to change brightness.
 

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Discussion Starter · #18 ·
Hi, thanks for the reply -

I unplugged/replugged the monitor cable with, alas, no result.
Changed user to the same effect.

Would a faulty chip in the monitor also alter the preferences interface in the way I described...?
 

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My guess (and that's all it is unfortunately) is that if the monitor doesn't conform to certain standards that allow for software to control the screen's brightness then Apple's software won't show the brightness control. For the majority of screens on the market you can just adjust it via the buttons on the screen. It is, of course, a bit of a pain when there are no controls on the screen ^_^;

If you have the option, try out another machine with this monitor and/or another monitor with the machine just to see if the issue persists.
 

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Discussion Starter · #20 · (Edited)
But but but . . . it's an Apple Display. And it interfaced just fine with the software (display prefs) until the 10.4.10 update.

I'd like the option to switch out the monitor/computer, but I have no Mac friends to borrow from.

:(
 

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